252 changed files with 1485 additions and 31996 deletions
--- a/.env.example
+++ b/.env.example
@ -1,36 +0,0 @@
-# =============================================================================
-# Tanabata File Manager — environment variables
-# Copy to .env and fill in the values.
-# =============================================================================
-
-# ---------------------------------------------------------------------------
-# Server
-# ---------------------------------------------------------------------------
-LISTEN_ADDR=:8080
-JWT_SECRET=change-me-to-a-random-32-byte-secret
-JWT_ACCESS_TTL=15m
-JWT_REFRESH_TTL=720h
-
-# ---------------------------------------------------------------------------
-# Database
-# ---------------------------------------------------------------------------
-DATABASE_URL=postgres://tanabata:password@localhost:5432/tanabata?sslmode=disable
-
-# ---------------------------------------------------------------------------
-# Storage
-# ---------------------------------------------------------------------------
-FILES_PATH=/data/files
-THUMBS_CACHE_PATH=/data/thumbs
-
-# ---------------------------------------------------------------------------
-# Thumbnails
-# ---------------------------------------------------------------------------
-THUMB_WIDTH=160
-THUMB_HEIGHT=160
-PREVIEW_WIDTH=1920
-PREVIEW_HEIGHT=1080
-
-# ---------------------------------------------------------------------------
-# Import
-# ---------------------------------------------------------------------------
-IMPORT_PATH=/data/import
--- a/.gitattributes
+++ b/.gitattributes
@ -1,67 +0,0 @@
-# =============================================================================
-# Tanabata File Manager — .gitattributes
-# =============================================================================
-
-# ---------------------------------------------------------------------------
-# Line endings: normalize to LF in repo, native on checkout
-# ---------------------------------------------------------------------------
-* text=auto eol=lf
-
-# ---------------------------------------------------------------------------
-# Explicitly text
-# ---------------------------------------------------------------------------
-*.go        text eol=lf
-*.mod       text eol=lf
-*.sum       text eol=lf
-*.sql       text eol=lf
-*.ts        text eol=lf
-*.js        text eol=lf
-*.svelte    text eol=lf
-*.html      text eol=lf
-*.css       text eol=lf
-*.json      text eol=lf
-*.yaml      text eol=lf
-*.yml       text eol=lf
-*.md        text eol=lf
-*.txt       text eol=lf
-*.env*      text eol=lf
-*.sh        text eol=lf
-*.toml      text eol=lf
-*.xml       text eol=lf
-*.svg       text eol=lf
-Dockerfile  text eol=lf
-Makefile    text eol=lf
-
-# ---------------------------------------------------------------------------
-# Explicitly binary
-# ---------------------------------------------------------------------------
-*.png       binary
-*.jpg       binary
-*.jpeg      binary
-*.gif       binary
-*.webp      binary
-*.ico       binary
-*.ttf       binary
-*.woff      binary
-*.woff2     binary
-*.eot       binary
-*.otf       binary
-*.zip       binary
-*.gz        binary
-*.tar       binary
-
-# ---------------------------------------------------------------------------
-# Diff behavior
-# ---------------------------------------------------------------------------
-*.sql       diff=sql
-*.go        diff=golang
-*.css       diff=css
-*.html      diff=html
-
-# ---------------------------------------------------------------------------
-# Linguist: set repo language stats correctly
-# ---------------------------------------------------------------------------
-docs/reference/** linguist-documentation
-frontend/static/** linguist-vendored
-*.min.js linguist-vendored
-*.min.css linguist-vendored
--- a/.gitignore
+++ b/.gitignore
@ -1,86 +0,0 @@
-# =============================================================================
-# Tanabata File Manager — .gitignore
-# =============================================================================
-
-# ---------------------------------------------------------------------------
-# Environment & secrets
-# ---------------------------------------------------------------------------
-.env
-.env.local
-.env.*.local
-*.pem
-*.key
-
-# ---------------------------------------------------------------------------
-# OS
-# ---------------------------------------------------------------------------
-.DS_Store
-Thumbs.db
-Desktop.ini
-*.swp
-*.swo
-*~
-
-# ---------------------------------------------------------------------------
-# IDE
-# ---------------------------------------------------------------------------
-.vscode/*
-!.vscode/extensions.json
-!.vscode/settings.json
-.idea/
-*.iml
-*.sublime-project
-*.sublime-workspace
-
-# ---------------------------------------------------------------------------
-# Backend (Go)
-# ---------------------------------------------------------------------------
-backend/tmp/
-backend/cmd/server/server
-*.exe
-*.exe~
-*.dll
-*.so
-*.dylib
-*.test
-*.out
-*.prof
-coverage.out
-coverage.html
-
-# ---------------------------------------------------------------------------
-# Frontend (SvelteKit / Node)
-# ---------------------------------------------------------------------------
-frontend/node_modules/
-frontend/.svelte-kit/
-frontend/build/
-frontend/dist/
-frontend/src/lib/api/schema.ts
-
-# ---------------------------------------------------------------------------
-# Docker
-# ---------------------------------------------------------------------------
-docker-compose.override.yml
-
-# ---------------------------------------------------------------------------
-# Data directories (runtime, not in repo)
-# ---------------------------------------------------------------------------
-data/
-*.sqlite
-*.sqlite3
-
-# ---------------------------------------------------------------------------
-# Misc
-# ---------------------------------------------------------------------------
-*.log
-*.pid
-*.seed
-
-# ---------------------------------------------------------------------------
-# Reference: exclude vendored libs, keep design sources
-# ---------------------------------------------------------------------------
-docs/reference/**/bootstrap.min.css
-docs/reference/**/bootstrap.min.css.map
-docs/reference/**/jquery-*.min.js
-docs/reference/**/__pycache__/
-docs/reference/**/*.pyc
--- a/CLAUDE.md
+++ b/CLAUDE.md
@ -1,58 +0,0 @@
-# Tanabata File Manager
-
-Multi-user, tag-based web file manager for images and video.
-
-## Architecture
-
-Monorepo: `backend/` (Go) + `frontend/` (SvelteKit).
-
- Backend: Go + Gin + pgx v5 + goose migrations. Clean Architecture.
- Frontend: SvelteKit SPA + Tailwind CSS + CSS custom properties.
- DB: PostgreSQL 14+.
- Auth: JWT Bearer tokens.
-
-## Key documents (read before coding)
-
- `openapi.yaml` — full REST API specification (36 paths, 58 operations)
- `docs/GO_PROJECT_STRUCTURE.md` — backend architecture, layer rules, DI pattern
- `docs/FRONTEND_STRUCTURE.md` — frontend architecture, CSS approach, API client
- `docs/Описание.md` — product requirements in Russian
- `backend/migrations/001_init.sql` — database schema (4 schemas, 16 tables)
-
-## Design reference
-
-The `docs/reference/` directory contains the previous Python/Flask version.
-Use its visual design as the basis for the new frontend:
- Color palette: #312F45 (bg), #9592B5 (accent), #444455 (tag default), #111118 (elevated)
- Font: Epilogue (variable weight)
- Dark theme is primary
- Mobile-first layout with bottom navbar
- 160×160 thumbnail grid for files
- Colored tag pills
- Floating selection bar for multi-select
-
-## Backend commands
-```bash
-cd backend
-go run ./cmd/server          # run dev server
-go test ./...                # run all tests
-```
-
-## Frontend commands
-```bash
-cd frontend
-npm run dev                  # vite dev server
-npm run build                # production build
-npm run generate:types       # regenerate API types from openapi.yaml
-```
-
-## Conventions
-
- Go: gofmt, no global state, context.Context as first param in all service methods
- TypeScript: strict mode, named exports
- SQL: snake_case, all migrations via goose
- API errors: { code, message, details? }
- Git: conventional commits with scope — `type(scope): message`
-  - `(backend)` for Go backend code
-  - `(frontend)` for SvelteKit/TypeScript code
-  - `(project)` for root-level files (.gitignore, docs/reference, structure)
--- a/backend/cmd/server/main.go
+++ b/backend/cmd/server/main.go
@ -1,119 +0,0 @@
-package main
-
-import (
-	"context"
-	"log/slog"
-	"os"
-
-	"github.com/jackc/pgx/v5/stdlib"
-	"github.com/pressly/goose/v3"
-
-	"tanabata/backend/internal/config"
-	"tanabata/backend/internal/db/postgres"
-	"tanabata/backend/internal/handler"
-	"tanabata/backend/internal/service"
-	"tanabata/backend/internal/storage"
-	"tanabata/backend/migrations"
-)
-
-func main() {
-	cfg, err := config.Load()
-	if err != nil {
-		slog.Error("failed to load config", "err", err)
-		os.Exit(1)
-	}
-
-	pool, err := postgres.NewPool(context.Background(), cfg.DatabaseURL)
-	if err != nil {
-		slog.Error("failed to connect to database", "err", err)
-		os.Exit(1)
-	}
-	defer pool.Close()
-	slog.Info("database connected")
-
-	migDB := stdlib.OpenDBFromPool(pool)
-	goose.SetBaseFS(migrations.FS)
-	if err := goose.SetDialect("postgres"); err != nil {
-		slog.Error("goose dialect error", "err", err)
-		os.Exit(1)
-	}
-	if err := goose.Up(migDB, "."); err != nil {
-		slog.Error("migrations failed", "err", err)
-		os.Exit(1)
-	}
-	migDB.Close()
-	slog.Info("migrations applied")
-
-	// Storage
-	diskStorage, err := storage.NewDiskStorage(
-		cfg.FilesPath,
-		cfg.ThumbsCachePath,
-		cfg.ThumbWidth, cfg.ThumbHeight,
-		cfg.PreviewWidth, cfg.PreviewHeight,
-	)
-	if err != nil {
-		slog.Error("failed to initialise storage", "err", err)
-		os.Exit(1)
-	}
-
-	// Repositories
-	userRepo     := postgres.NewUserRepo(pool)
-	sessionRepo  := postgres.NewSessionRepo(pool)
-	fileRepo     := postgres.NewFileRepo(pool)
-	mimeRepo     := postgres.NewMimeRepo(pool)
-	aclRepo      := postgres.NewACLRepo(pool)
-	auditRepo    := postgres.NewAuditRepo(pool)
-	tagRepo      := postgres.NewTagRepo(pool)
-	tagRuleRepo  := postgres.NewTagRuleRepo(pool)
-	categoryRepo := postgres.NewCategoryRepo(pool)
-	poolRepo     := postgres.NewPoolRepo(pool)
-	transactor   := postgres.NewTransactor(pool)
-
-	// Services
-	authSvc := service.NewAuthService(
-		userRepo,
-		sessionRepo,
-		cfg.JWTSecret,
-		cfg.JWTAccessTTL,
-		cfg.JWTRefreshTTL,
-	)
-	aclSvc      := service.NewACLService(aclRepo)
-	auditSvc    := service.NewAuditService(auditRepo)
-	tagSvc      := service.NewTagService(tagRepo, tagRuleRepo, aclSvc, auditSvc, transactor)
-	categorySvc := service.NewCategoryService(categoryRepo, tagRepo, aclSvc, auditSvc)
-	poolSvc     := service.NewPoolService(poolRepo, aclSvc, auditSvc)
-	fileSvc     := service.NewFileService(
-		fileRepo,
-		mimeRepo,
-		diskStorage,
-		aclSvc,
-		auditSvc,
-		tagSvc,
-		transactor,
-		cfg.ImportPath,
-	)
-	userSvc := service.NewUserService(userRepo, auditSvc)
-
-	// Handlers
-	authMiddleware  := handler.NewAuthMiddleware(authSvc)
-	authHandler     := handler.NewAuthHandler(authSvc)
-	fileHandler     := handler.NewFileHandler(fileSvc, tagSvc)
-	tagHandler      := handler.NewTagHandler(tagSvc, fileSvc)
-	categoryHandler := handler.NewCategoryHandler(categorySvc)
-	poolHandler     := handler.NewPoolHandler(poolSvc)
-	userHandler     := handler.NewUserHandler(userSvc)
-	aclHandler      := handler.NewACLHandler(aclSvc)
-	auditHandler    := handler.NewAuditHandler(auditSvc)
-
-	r := handler.NewRouter(
-		authMiddleware, authHandler,
-		fileHandler, tagHandler, categoryHandler, poolHandler,
-		userHandler, aclHandler, auditHandler,
-	)
-
-	slog.Info("starting server", "addr", cfg.ListenAddr)
-	if err := r.Run(cfg.ListenAddr); err != nil {
-		slog.Error("server error", "err", err)
-		os.Exit(1)
-	}
-}
--- a/backend/go.mod
+++ b/backend/go.mod
@ -1,104 +1,19 @@
-module tanabata/backend
+module tanabata

-go 1.26
+go 1.23.0

-toolchain go1.26.1
+toolchain go1.23.10
+
+require github.com/jackc/pgx/v5 v5.7.5

 require (
-	github.com/disintegration/imaging v1.6.2
-	github.com/gabriel-vasile/mimetype v1.4.12
-	github.com/gin-gonic/gin v1.9.1
-	github.com/golang-jwt/jwt/v5 v5.3.1
-	github.com/google/uuid v1.6.0
-	github.com/jackc/pgx/v5 v5.5.5
-	github.com/joho/godotenv v1.5.1
-	github.com/pressly/goose/v3 v3.21.1
-	github.com/rwcarlsen/goexif v0.0.0-20190401172101-9e8deecbddbd
-	github.com/stretchr/testify v1.11.1
-	github.com/testcontainers/testcontainers-go v0.41.0
-	github.com/testcontainers/testcontainers-go/modules/postgres v0.41.0
-	golang.org/x/crypto v0.48.0
-	golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8
-)
-
-require (
-	dario.cat/mergo v1.0.2 // indirect
-	github.com/Azure/go-ansiterm v0.0.0-20250102033503-faa5f7b0171c // indirect
-	github.com/Microsoft/go-winio v0.6.2 // indirect
-	github.com/bytedance/gopkg v0.1.3 // indirect
-	github.com/bytedance/sonic v1.15.0 // indirect
-	github.com/bytedance/sonic/loader v0.5.0 // indirect
-	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
-	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/cloudwego/base64x v0.1.6 // indirect
-	github.com/containerd/errdefs v1.0.0 // indirect
-	github.com/containerd/errdefs/pkg v0.3.0 // indirect
-	github.com/containerd/log v0.1.0 // indirect
-	github.com/containerd/platforms v0.2.1 // indirect
-	github.com/cpuguy83/dockercfg v0.3.2 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/distribution/reference v0.6.0 // indirect
-	github.com/docker/docker v28.5.2+incompatible // indirect
-	github.com/docker/go-connections v0.6.0 // indirect
-	github.com/docker/go-units v0.5.0 // indirect
-	github.com/ebitengine/purego v0.10.0 // indirect
-	github.com/felixge/httpsnoop v1.0.4 // indirect
-	github.com/gin-contrib/sse v0.1.0 // indirect
-	github.com/go-logr/logr v1.4.3 // indirect
-	github.com/go-logr/stdr v1.2.2 // indirect
-	github.com/go-ole/go-ole v1.2.6 // indirect
-	github.com/go-playground/locales v0.14.1 // indirect
-	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/go-playground/validator/v10 v10.22.0 // indirect
-	github.com/goccy/go-json v0.10.5 // indirect
-	github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
-	github.com/jackc/puddle/v2 v2.2.1 // indirect
-	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/compress v1.18.2 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.9 // indirect
-	github.com/leodido/go-urn v1.4.0 // indirect
-	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
-	github.com/magiconair/properties v1.8.10 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/mfridman/interpolate v0.0.2 // indirect
-	github.com/moby/docker-image-spec v1.3.1 // indirect
-	github.com/moby/go-archive v0.2.0 // indirect
-	github.com/moby/patternmatcher v0.6.0 // indirect
-	github.com/moby/sys/sequential v0.6.0 // indirect
-	github.com/moby/sys/user v0.4.0 // indirect
-	github.com/moby/sys/userns v0.1.0 // indirect
-	github.com/moby/term v0.5.2 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.2 // indirect
-	github.com/morikuni/aec v1.0.0 // indirect
-	github.com/opencontainers/go-digest v1.0.0 // indirect
-	github.com/opencontainers/image-spec v1.1.1 // indirect
-	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
+	github.com/jackc/pgx v3.6.2+incompatible // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect
-	github.com/sethvargo/go-retry v0.3.0 // indirect
-	github.com/shirou/gopsutil/v4 v4.26.2 // indirect
-	github.com/sirupsen/logrus v1.9.3 // indirect
-	github.com/tklauser/go-sysconf v0.3.16 // indirect
-	github.com/tklauser/numcpus v0.11.0 // indirect
-	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
-	github.com/ugorji/go/codec v1.3.1 // indirect
-	github.com/yusufpapurcu/wmi v1.2.4 // indirect
-	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect
-	go.opentelemetry.io/otel v1.41.0 // indirect
-	go.opentelemetry.io/otel/metric v1.41.0 // indirect
-	go.opentelemetry.io/otel/trace v1.41.0 // indirect
-	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/arch v0.22.0 // indirect
-	golang.org/x/net v0.49.0 // indirect
-	golang.org/x/sync v0.19.0 // indirect
-	golang.org/x/sys v0.41.0 // indirect
-	golang.org/x/text v0.34.0 // indirect
-	google.golang.org/grpc v1.79.1 // indirect
-	google.golang.org/protobuf v1.36.11 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
+	github.com/stretchr/testify v1.9.0 // indirect
+	golang.org/x/crypto v0.37.0 // indirect
+	golang.org/x/sync v0.13.0 // indirect
+	golang.org/x/text v0.24.0 // indirect
 )
--- a/backend/go.sum
+++ b/backend/go.sum
@ -1,275 +1,32 @@
-dario.cat/mergo v1.0.2 h1:85+piFYR1tMbRrLcDwR18y4UKJ3aH1Tbzi24VRW1TK8=
-dario.cat/mergo v1.0.2/go.mod h1:E/hbnu0NxMFBjpMIE34DRGLWqDy0g5FuKDhCb31ngxA=
-github.com/AdaLogics/go-fuzz-headers v0.0.0-20240806141605-e8a1dd7889d6 h1:He8afgbRMd7mFxO99hRNu+6tazq8nFF9lIwo9JFroBk=
-github.com/AdaLogics/go-fuzz-headers v0.0.0-20240806141605-e8a1dd7889d6/go.mod h1:8o94RPi1/7XTJvwPpRSzSUedZrtlirdB3r9Z20bi2f8=
-github.com/Azure/go-ansiterm v0.0.0-20250102033503-faa5f7b0171c h1:udKWzYgxTojEKWjV8V+WSxDXJ4NFATAsZjh8iIbsQIg=
-github.com/Azure/go-ansiterm v0.0.0-20250102033503-faa5f7b0171c/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
-github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
-github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
-github.com/bytedance/gopkg v0.1.3 h1:TPBSwH8RsouGCBcMBktLt1AymVo2TVsBVCY4b6TnZ/M=
-github.com/bytedance/gopkg v0.1.3/go.mod h1:576VvJ+eJgyCzdjS+c4+77QF3p7ubbtiKARP3TxducM=
-github.com/bytedance/sonic v1.15.0 h1:/PXeWFaR5ElNcVE84U0dOHjiMHQOwNIx3K4ymzh/uSE=
-github.com/bytedance/sonic v1.15.0/go.mod h1:tFkWrPz0/CUCLEF4ri4UkHekCIcdnkqXw9VduqpJh0k=
-github.com/bytedance/sonic/loader v0.5.0 h1:gXH3KVnatgY7loH5/TkeVyXPfESoqSBSBEiDd5VjlgE=
-github.com/bytedance/sonic/loader v0.5.0/go.mod h1:AR4NYCk5DdzZizZ5djGqQ92eEhCCcdf5x77udYiSJRo=
-github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
-github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
-github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM=
-github.com/cenkalti/backoff/v5 v5.0.3/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw=
-github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
-github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/cloudwego/base64x v0.1.6 h1:t11wG9AECkCDk5fMSoxmufanudBtJ+/HemLstXDLI2M=
-github.com/cloudwego/base64x v0.1.6/go.mod h1:OFcloc187FXDaYHvrNIjxSe8ncn0OOM8gEHfghB2IPU=
-github.com/containerd/errdefs v1.0.0 h1:tg5yIfIlQIrxYtu9ajqY42W3lpS19XqdxRQeEwYG8PI=
-github.com/containerd/errdefs v1.0.0/go.mod h1:+YBYIdtsnF4Iw6nWZhJcqGSg/dwvV7tyJ/kCkyJ2k+M=
-github.com/containerd/errdefs/pkg v0.3.0 h1:9IKJ06FvyNlexW690DXuQNx2KA2cUJXx151Xdx3ZPPE=
-github.com/containerd/errdefs/pkg v0.3.0/go.mod h1:NJw6s9HwNuRhnjJhM7pylWwMyAkmCQvQ4GpJHEqRLVk=
-github.com/containerd/log v0.1.0 h1:TCJt7ioM2cr/tfR8GPbGf9/VRAX8D2B4PjzCpfX540I=
-github.com/containerd/log v0.1.0/go.mod h1:VRRf09a7mHDIRezVKTRCrOq78v577GXq3bSa3EhrzVo=
-github.com/containerd/platforms v0.2.1 h1:zvwtM3rz2YHPQsF2CHYM8+KtB5dvhISiXh5ZpSBQv6A=
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--- a/backend/internal/config/config.go
+++ b/backend/internal/config/config.go
@ -1,107 +0,0 @@
-package config
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"strconv"
-	"time"
-
-	"github.com/joho/godotenv"
-)
-
-// Config holds all application configuration loaded from environment variables.
-type Config struct {
-	// Server
-	ListenAddr    string
-	JWTSecret     string
-	JWTAccessTTL  time.Duration
-	JWTRefreshTTL time.Duration
-
-	// Database
-	DatabaseURL string
-
-	// Storage
-	FilesPath       string
-	ThumbsCachePath string
-
-	// Thumbnails
-	ThumbWidth    int
-	ThumbHeight   int
-	PreviewWidth  int
-	PreviewHeight int
-
-	// Import
-	ImportPath string
-}
-
-// Load reads a .env file (if present) then loads all configuration from
-// environment variables. Returns an error listing every missing or invalid var.
-func Load() (*Config, error) {
-	// Non-fatal: .env may not exist in production.
-	_ = godotenv.Load()
-
-	var errs []error
-
-	requireStr := func(key string) string {
-		v := os.Getenv(key)
-		if v == "" {
-			errs = append(errs, fmt.Errorf("%s is required", key))
-		}
-		return v
-	}
-
-	defaultStr := func(key, def string) string {
-		if v := os.Getenv(key); v != "" {
-			return v
-		}
-		return def
-	}
-
-	parseDuration := func(key, def string) time.Duration {
-		raw := defaultStr(key, def)
-		d, err := time.ParseDuration(raw)
-		if err != nil {
-			errs = append(errs, fmt.Errorf("%s: invalid duration %q: %w", key, raw, err))
-			return 0
-		}
-		return d
-	}
-
-	parseInt := func(key string, def int) int {
-		raw := os.Getenv(key)
-		if raw == "" {
-			return def
-		}
-		n, err := strconv.Atoi(raw)
-		if err != nil {
-			errs = append(errs, fmt.Errorf("%s: invalid integer %q: %w", key, raw, err))
-			return def
-		}
-		return n
-	}
-
-	cfg := &Config{
-		ListenAddr:    defaultStr("LISTEN_ADDR", ":8080"),
-		JWTSecret:     requireStr("JWT_SECRET"),
-		JWTAccessTTL:  parseDuration("JWT_ACCESS_TTL", "15m"),
-		JWTRefreshTTL: parseDuration("JWT_REFRESH_TTL", "720h"),
-
-		DatabaseURL: requireStr("DATABASE_URL"),
-
-		FilesPath:       requireStr("FILES_PATH"),
-		ThumbsCachePath: requireStr("THUMBS_CACHE_PATH"),
-
-		ThumbWidth:    parseInt("THUMB_WIDTH", 160),
-		ThumbHeight:   parseInt("THUMB_HEIGHT", 160),
-		PreviewWidth:  parseInt("PREVIEW_WIDTH", 1920),
-		PreviewHeight: parseInt("PREVIEW_HEIGHT", 1080),
-
-		ImportPath: requireStr("IMPORT_PATH"),
-	}
-
-	if len(errs) > 0 {
-		return nil, errors.Join(errs...)
-	}
-	return cfg, nil
-}
--- a/backend/internal/db/db.go
+++ b/backend/internal/db/db.go
@ -1,70 +0,0 @@
-// Package db provides shared helpers used by all database adapters.
-package db
-
-import (
-	"context"
-	"fmt"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgconn"
-)
-
-// txKey is the context key used to store an active transaction.
-type txKey struct{}
-
-// TxFromContext returns the pgx.Tx stored in ctx by the Transactor, along
-// with a boolean indicating whether a transaction is active.
-func TxFromContext(ctx context.Context) (pgx.Tx, bool) {
-	tx, ok := ctx.Value(txKey{}).(pgx.Tx)
-	return tx, ok
-}
-
-// ContextWithTx returns a copy of ctx that carries tx.
-// Called by the Transactor before invoking the user function.
-func ContextWithTx(ctx context.Context, tx pgx.Tx) context.Context {
-	return context.WithValue(ctx, txKey{}, tx)
-}
-
-// Querier is the common query interface satisfied by both *pgxpool.Pool and
-// pgx.Tx, allowing repo helpers to work with either.
-type Querier interface {
-	QueryRow(ctx context.Context, sql string, args ...any) pgx.Row
-	Query(ctx context.Context, sql string, args ...any) (pgx.Rows, error)
-	Exec(ctx context.Context, sql string, args ...any) (pgconn.CommandTag, error)
-}
-
-// ScanRow executes a single-row query against q and scans the result using
-// scan. It wraps pgx.ErrNoRows so callers can detect missing rows without
-// importing pgx directly.
-func ScanRow[T any](ctx context.Context, q Querier, sql string, args []any, scan func(pgx.Row) (T, error)) (T, error) {
-	row := q.QueryRow(ctx, sql, args...)
-	val, err := scan(row)
-	if err != nil {
-		var zero T
-		if err == pgx.ErrNoRows {
-			return zero, fmt.Errorf("%w", pgx.ErrNoRows)
-		}
-		return zero, fmt.Errorf("ScanRow: %w", err)
-	}
-	return val, nil
-}
-
-// ClampLimit enforces the [1, max] range on limit, returning def when limit
-// is zero or negative.
-func ClampLimit(limit, def, max int) int {
-	if limit <= 0 {
-		return def
-	}
-	if limit > max {
-		return max
-	}
-	return limit
-}
-
-// ClampOffset returns 0 for negative offsets.
-func ClampOffset(offset int) int {
-	if offset < 0 {
-		return 0
-	}
-	return offset
-}
--- a/backend/internal/db/postgres/acl_repo.go
+++ b/backend/internal/db/postgres/acl_repo.go
@ -1,118 +0,0 @@
-package postgres
-
-import (
-	"context"
-	"errors"
-	"fmt"
-
-	"github.com/google/uuid"
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-type permissionRow struct {
-	UserID       int16     `db:"user_id"`
-	UserName     string    `db:"user_name"`
-	ObjectTypeID int16     `db:"object_type_id"`
-	ObjectID     uuid.UUID `db:"object_id"`
-	CanView      bool      `db:"can_view"`
-	CanEdit      bool      `db:"can_edit"`
-}
-
-func toPermission(r permissionRow) domain.Permission {
-	return domain.Permission{
-		UserID:       r.UserID,
-		UserName:     r.UserName,
-		ObjectTypeID: r.ObjectTypeID,
-		ObjectID:     r.ObjectID,
-		CanView:      r.CanView,
-		CanEdit:      r.CanEdit,
-	}
-}
-
-// ACLRepo implements port.ACLRepo using PostgreSQL.
-type ACLRepo struct {
-	pool *pgxpool.Pool
-}
-
-// NewACLRepo creates an ACLRepo backed by pool.
-func NewACLRepo(pool *pgxpool.Pool) *ACLRepo {
-	return &ACLRepo{pool: pool}
-}
-
-var _ port.ACLRepo = (*ACLRepo)(nil)
-
-func (r *ACLRepo) List(ctx context.Context, objectTypeID int16, objectID uuid.UUID) ([]domain.Permission, error) {
-	const sql = `
-		SELECT p.user_id, u.name AS user_name, p.object_type_id, p.object_id,
-		       p.can_view, p.can_edit
-		FROM acl.permissions p
-		JOIN core.users u ON u.id = p.user_id
-		WHERE p.object_type_id = $1 AND p.object_id = $2
-		ORDER BY u.name`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, objectTypeID, objectID)
-	if err != nil {
-		return nil, fmt.Errorf("ACLRepo.List: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[permissionRow])
-	if err != nil {
-		return nil, fmt.Errorf("ACLRepo.List scan: %w", err)
-	}
-	perms := make([]domain.Permission, len(collected))
-	for i, row := range collected {
-		perms[i] = toPermission(row)
-	}
-	return perms, nil
-}
-
-func (r *ACLRepo) Get(ctx context.Context, userID int16, objectTypeID int16, objectID uuid.UUID) (*domain.Permission, error) {
-	const sql = `
-		SELECT p.user_id, u.name AS user_name, p.object_type_id, p.object_id,
-		       p.can_view, p.can_edit
-		FROM acl.permissions p
-		JOIN core.users u ON u.id = p.user_id
-		WHERE p.user_id = $1 AND p.object_type_id = $2 AND p.object_id = $3`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, userID, objectTypeID, objectID)
-	if err != nil {
-		return nil, fmt.Errorf("ACLRepo.Get: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[permissionRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("ACLRepo.Get scan: %w", err)
-	}
-	p := toPermission(row)
-	return &p, nil
-}
-
-func (r *ACLRepo) Set(ctx context.Context, objectTypeID int16, objectID uuid.UUID, perms []domain.Permission) error {
-	q := connOrTx(ctx, r.pool)
-
-	const del = `DELETE FROM acl.permissions WHERE object_type_id = $1 AND object_id = $2`
-	if _, err := q.Exec(ctx, del, objectTypeID, objectID); err != nil {
-		return fmt.Errorf("ACLRepo.Set delete: %w", err)
-	}
-
-	if len(perms) == 0 {
-		return nil
-	}
-
-	const ins = `
-		INSERT INTO acl.permissions (user_id, object_type_id, object_id, can_view, can_edit)
-		VALUES ($1, $2, $3, $4, $5)`
-	for _, p := range perms {
-		if _, err := q.Exec(ctx, ins, p.UserID, objectTypeID, objectID, p.CanView, p.CanEdit); err != nil {
-			return fmt.Errorf("ACLRepo.Set insert: %w", err)
-		}
-	}
-	return nil
-}
--- a/backend/internal/db/postgres/audit_repo.go
+++ b/backend/internal/db/postgres/audit_repo.go
@ -1,169 +0,0 @@
-package postgres
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"strings"
-	"time"
-
-	"github.com/google/uuid"
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-
-	"tanabata/backend/internal/db"
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// auditRowWithTotal matches the columns returned by the audit log SELECT.
-// object_type is nullable (LEFT JOIN), object_id and details are nullable columns.
-type auditRowWithTotal struct {
-	ID          int64           `db:"id"`
-	UserID      int16           `db:"user_id"`
-	UserName    string          `db:"user_name"`
-	Action      string          `db:"action"`
-	ObjectType  *string         `db:"object_type"`
-	ObjectID    *uuid.UUID      `db:"object_id"`
-	Details     json.RawMessage `db:"details"`
-	PerformedAt time.Time       `db:"performed_at"`
-	Total       int             `db:"total"`
-}
-
-func toAuditEntry(r auditRowWithTotal) domain.AuditEntry {
-	return domain.AuditEntry{
-		ID:          r.ID,
-		UserID:      r.UserID,
-		UserName:    r.UserName,
-		Action:      r.Action,
-		ObjectType:  r.ObjectType,
-		ObjectID:    r.ObjectID,
-		Details:     r.Details,
-		PerformedAt: r.PerformedAt,
-	}
-}
-
-// AuditRepo implements port.AuditRepo using PostgreSQL.
-type AuditRepo struct {
-	pool *pgxpool.Pool
-}
-
-// NewAuditRepo creates an AuditRepo backed by pool.
-func NewAuditRepo(pool *pgxpool.Pool) *AuditRepo {
-	return &AuditRepo{pool: pool}
-}
-
-var _ port.AuditRepo = (*AuditRepo)(nil)
-
-// Log inserts one audit record. action_type_id and object_type_id are resolved
-// from the reference tables inside the INSERT via subqueries.
-func (r *AuditRepo) Log(ctx context.Context, entry domain.AuditEntry) error {
-	const sql = `
-		INSERT INTO activity.audit_log
-		    (user_id, action_type_id, object_type_id, object_id, details)
-		VALUES (
-		    $1,
-		    (SELECT id FROM activity.action_types WHERE name = $2),
-		    CASE WHEN $3::text IS NOT NULL
-		         THEN (SELECT id FROM core.object_types WHERE name = $3)
-		         ELSE NULL END,
-		    $4,
-		    $5
-		)`
-
-	q := connOrTx(ctx, r.pool)
-	_, err := q.Exec(ctx, sql,
-		entry.UserID,
-		entry.Action,
-		entry.ObjectType,
-		entry.ObjectID,
-		entry.Details,
-	)
-	if err != nil {
-		return fmt.Errorf("AuditRepo.Log: %w", err)
-	}
-	return nil
-}
-
-// List returns a filtered, offset-paginated page of audit log entries ordered
-// newest-first.
-func (r *AuditRepo) List(ctx context.Context, filter domain.AuditFilter) (*domain.AuditPage, error) {
-	var conds []string
-	args := make([]any, 0, 8)
-	n := 1
-
-	if filter.UserID != nil {
-		conds = append(conds, fmt.Sprintf("a.user_id = $%d", n))
-		args = append(args, *filter.UserID)
-		n++
-	}
-	if filter.Action != "" {
-		conds = append(conds, fmt.Sprintf("at.name = $%d", n))
-		args = append(args, filter.Action)
-		n++
-	}
-	if filter.ObjectType != "" {
-		conds = append(conds, fmt.Sprintf("ot.name = $%d", n))
-		args = append(args, filter.ObjectType)
-		n++
-	}
-	if filter.ObjectID != nil {
-		conds = append(conds, fmt.Sprintf("a.object_id = $%d", n))
-		args = append(args, *filter.ObjectID)
-		n++
-	}
-	if filter.From != nil {
-		conds = append(conds, fmt.Sprintf("a.performed_at >= $%d", n))
-		args = append(args, *filter.From)
-		n++
-	}
-	if filter.To != nil {
-		conds = append(conds, fmt.Sprintf("a.performed_at <= $%d", n))
-		args = append(args, *filter.To)
-		n++
-	}
-
-	where := ""
-	if len(conds) > 0 {
-		where = "WHERE " + strings.Join(conds, " AND ")
-	}
-
-	limit := db.ClampLimit(filter.Limit, 50, 200)
-	offset := db.ClampOffset(filter.Offset)
-	args = append(args, limit, offset)
-
-	sql := fmt.Sprintf(`
-		SELECT a.id, a.user_id, u.name AS user_name,
-		       at.name AS action,
-		       ot.name AS object_type,
-		       a.object_id, a.details,
-		       a.performed_at,
-		       COUNT(*) OVER() AS total
-		FROM activity.audit_log a
-		JOIN  core.users u             ON u.id  = a.user_id
-		JOIN  activity.action_types at ON at.id = a.action_type_id
-		LEFT JOIN core.object_types ot ON ot.id = a.object_type_id
-		%s
-		ORDER BY a.performed_at DESC
-		LIMIT $%d OFFSET $%d`, where, n, n+1)
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, args...)
-	if err != nil {
-		return nil, fmt.Errorf("AuditRepo.List: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[auditRowWithTotal])
-	if err != nil {
-		return nil, fmt.Errorf("AuditRepo.List scan: %w", err)
-	}
-
-	page := &domain.AuditPage{Offset: offset, Limit: limit}
-	if len(collected) > 0 {
-		page.Total = collected[0].Total
-	}
-	page.Items = make([]domain.AuditEntry, len(collected))
-	for i, row := range collected {
-		page.Items[i] = toAuditEntry(row)
-	}
-	return page, nil
-}
--- a/backend/internal/db/postgres/category_repo.go
+++ b/backend/internal/db/postgres/category_repo.go
@ -1,297 +0,0 @@
-package postgres
-
-import (
-	"context"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"strings"
-
-	"github.com/google/uuid"
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// ---------------------------------------------------------------------------
-// Row struct
-// ---------------------------------------------------------------------------
-
-type categoryRow struct {
-	ID          uuid.UUID `db:"id"`
-	Name        string    `db:"name"`
-	Notes       *string   `db:"notes"`
-	Color       *string   `db:"color"`
-	Metadata    []byte    `db:"metadata"`
-	CreatorID   int16     `db:"creator_id"`
-	CreatorName string    `db:"creator_name"`
-	IsPublic    bool      `db:"is_public"`
-}
-
-type categoryRowWithTotal struct {
-	categoryRow
-	Total int `db:"total"`
-}
-
-// ---------------------------------------------------------------------------
-// Converter
-// ---------------------------------------------------------------------------
-
-func toCategory(r categoryRow) domain.Category {
-	c := domain.Category{
-		ID:          r.ID,
-		Name:        r.Name,
-		Notes:       r.Notes,
-		Color:       r.Color,
-		CreatorID:   r.CreatorID,
-		CreatorName: r.CreatorName,
-		IsPublic:    r.IsPublic,
-		CreatedAt:   domain.UUIDCreatedAt(r.ID),
-	}
-	if len(r.Metadata) > 0 && string(r.Metadata) != "null" {
-		c.Metadata = json.RawMessage(r.Metadata)
-	}
-	return c
-}
-
-// ---------------------------------------------------------------------------
-// Shared SQL
-// ---------------------------------------------------------------------------
-
-const categorySelectFrom = `
-SELECT
-    c.id,
-    c.name,
-    c.notes,
-    c.color,
-    c.metadata,
-    c.creator_id,
-    u.name AS creator_name,
-    c.is_public
-FROM data.categories c
-JOIN core.users u ON u.id = c.creator_id`
-
-func categorySortColumn(s string) string {
-	if s == "name" {
-		return "c.name"
-	}
-	return "c.id" // "created"
-}
-
-// ---------------------------------------------------------------------------
-// CategoryRepo — implements port.CategoryRepo
-// ---------------------------------------------------------------------------
-
-// CategoryRepo handles category CRUD using PostgreSQL.
-type CategoryRepo struct {
-	pool *pgxpool.Pool
-}
-
-var _ port.CategoryRepo = (*CategoryRepo)(nil)
-
-// NewCategoryRepo creates a CategoryRepo backed by pool.
-func NewCategoryRepo(pool *pgxpool.Pool) *CategoryRepo {
-	return &CategoryRepo{pool: pool}
-}
-
-// ---------------------------------------------------------------------------
-// List
-// ---------------------------------------------------------------------------
-
-func (r *CategoryRepo) List(ctx context.Context, params port.OffsetParams) (*domain.CategoryOffsetPage, error) {
-	order := "ASC"
-	if strings.ToLower(params.Order) == "desc" {
-		order = "DESC"
-	}
-	sortCol := categorySortColumn(params.Sort)
-
-	args := []any{}
-	n := 1
-	var conditions []string
-
-	if params.Search != "" {
-		conditions = append(conditions, fmt.Sprintf("lower(c.name) LIKE lower($%d)", n))
-		args = append(args, "%"+params.Search+"%")
-		n++
-	}
-
-	where := ""
-	if len(conditions) > 0 {
-		where = "WHERE " + strings.Join(conditions, " AND ")
-	}
-
-	limit := params.Limit
-	if limit <= 0 {
-		limit = 50
-	}
-	offset := params.Offset
-	if offset < 0 {
-		offset = 0
-	}
-
-	query := fmt.Sprintf(`
-SELECT
-    c.id, c.name, c.notes, c.color, c.metadata,
-    c.creator_id, u.name AS creator_name, c.is_public,
-    COUNT(*) OVER() AS total
-FROM data.categories c
-JOIN core.users u ON u.id = c.creator_id
-%s
-ORDER BY %s %s NULLS LAST, c.id ASC
-LIMIT $%d OFFSET $%d`, where, sortCol, order, n, n+1)
-
-	args = append(args, limit, offset)
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, args...)
-	if err != nil {
-		return nil, fmt.Errorf("CategoryRepo.List query: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[categoryRowWithTotal])
-	if err != nil {
-		return nil, fmt.Errorf("CategoryRepo.List scan: %w", err)
-	}
-
-	items := make([]domain.Category, len(collected))
-	total := 0
-	for i, row := range collected {
-		items[i] = toCategory(row.categoryRow)
-		total = row.Total
-	}
-	return &domain.CategoryOffsetPage{
-		Items:  items,
-		Total:  total,
-		Offset: offset,
-		Limit:  limit,
-	}, nil
-}
-
-// ---------------------------------------------------------------------------
-// GetByID
-// ---------------------------------------------------------------------------
-
-func (r *CategoryRepo) GetByID(ctx context.Context, id uuid.UUID) (*domain.Category, error) {
-	const query = categorySelectFrom + `
-WHERE c.id = $1`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, id)
-	if err != nil {
-		return nil, fmt.Errorf("CategoryRepo.GetByID: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[categoryRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("CategoryRepo.GetByID scan: %w", err)
-	}
-	c := toCategory(row)
-	return &c, nil
-}
-
-// ---------------------------------------------------------------------------
-// Create
-// ---------------------------------------------------------------------------
-
-func (r *CategoryRepo) Create(ctx context.Context, c *domain.Category) (*domain.Category, error) {
-	const query = `
-WITH ins AS (
-    INSERT INTO data.categories (name, notes, color, metadata, creator_id, is_public)
-    VALUES ($1, $2, $3, $4, $5, $6)
-    RETURNING *
-)
-SELECT ins.id, ins.name, ins.notes, ins.color, ins.metadata,
-       ins.creator_id, u.name AS creator_name, ins.is_public
-FROM ins
-JOIN core.users u ON u.id = ins.creator_id`
-
-	var meta any
-	if len(c.Metadata) > 0 {
-		meta = c.Metadata
-	}
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query,
-		c.Name, c.Notes, c.Color, meta, c.CreatorID, c.IsPublic)
-	if err != nil {
-		return nil, fmt.Errorf("CategoryRepo.Create: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[categoryRow])
-	if err != nil {
-		if isPgUniqueViolation(err) {
-			return nil, domain.ErrConflict
-		}
-		return nil, fmt.Errorf("CategoryRepo.Create scan: %w", err)
-	}
-	created := toCategory(row)
-	return &created, nil
-}
-
-// ---------------------------------------------------------------------------
-// Update
-// ---------------------------------------------------------------------------
-
-// Update replaces all mutable fields. The caller must merge current values
-// with the patch before calling (read-then-write semantics).
-func (r *CategoryRepo) Update(ctx context.Context, id uuid.UUID, c *domain.Category) (*domain.Category, error) {
-	const query = `
-WITH upd AS (
-    UPDATE data.categories SET
-        name      = $2,
-        notes     = $3,
-        color     = $4,
-        metadata  = COALESCE($5, metadata),
-        is_public = $6
-    WHERE id = $1
-    RETURNING *
-)
-SELECT upd.id, upd.name, upd.notes, upd.color, upd.metadata,
-       upd.creator_id, u.name AS creator_name, upd.is_public
-FROM upd
-JOIN core.users u ON u.id = upd.creator_id`
-
-	var meta any
-	if len(c.Metadata) > 0 {
-		meta = c.Metadata
-	}
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query,
-		id, c.Name, c.Notes, c.Color, meta, c.IsPublic)
-	if err != nil {
-		return nil, fmt.Errorf("CategoryRepo.Update: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[categoryRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		if isPgUniqueViolation(err) {
-			return nil, domain.ErrConflict
-		}
-		return nil, fmt.Errorf("CategoryRepo.Update scan: %w", err)
-	}
-	updated := toCategory(row)
-	return &updated, nil
-}
-
-// ---------------------------------------------------------------------------
-// Delete
-// ---------------------------------------------------------------------------
-
-func (r *CategoryRepo) Delete(ctx context.Context, id uuid.UUID) error {
-	const query = `DELETE FROM data.categories WHERE id = $1`
-
-	q := connOrTx(ctx, r.pool)
-	ct, err := q.Exec(ctx, query, id)
-	if err != nil {
-		return fmt.Errorf("CategoryRepo.Delete: %w", err)
-	}
-	if ct.RowsAffected() == 0 {
-		return domain.ErrNotFound
-	}
-	return nil
-}
--- a/backend/internal/db/postgres/file_repo.go
+++ b/backend/internal/db/postgres/file_repo.go
@ -1,796 +0,0 @@
-package postgres
-
-import (
-	"context"
-	"encoding/base64"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"strings"
-	"time"
-
-	"github.com/google/uuid"
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-
-	"tanabata/backend/internal/db"
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// ---------------------------------------------------------------------------
-// Row structs
-// ---------------------------------------------------------------------------
-
-type fileRow struct {
-	ID              uuid.UUID       `db:"id"`
-	OriginalName    *string         `db:"original_name"`
-	MIMEType        string          `db:"mime_type"`
-	MIMEExtension   string          `db:"mime_extension"`
-	ContentDatetime time.Time       `db:"content_datetime"`
-	Notes           *string         `db:"notes"`
-	Metadata        json.RawMessage `db:"metadata"`
-	EXIF            json.RawMessage `db:"exif"`
-	PHash           *int64          `db:"phash"`
-	CreatorID       int16           `db:"creator_id"`
-	CreatorName     string          `db:"creator_name"`
-	IsPublic        bool            `db:"is_public"`
-	IsDeleted       bool            `db:"is_deleted"`
-}
-
-// fileTagRow is used for both single-file and batch tag loading.
-// file_id is always selected so the same struct works for both cases.
-type fileTagRow struct {
-	FileID        uuid.UUID       `db:"file_id"`
-	ID            uuid.UUID       `db:"id"`
-	Name          string          `db:"name"`
-	Notes         *string         `db:"notes"`
-	Color         *string         `db:"color"`
-	CategoryID    *uuid.UUID      `db:"category_id"`
-	CategoryName  *string         `db:"category_name"`
-	CategoryColor *string         `db:"category_color"`
-	Metadata      json.RawMessage `db:"metadata"`
-	CreatorID     int16           `db:"creator_id"`
-	CreatorName   string          `db:"creator_name"`
-	IsPublic      bool            `db:"is_public"`
-}
-
-// anchorValRow holds the sort-column values fetched for an anchor file.
-type anchorValRow struct {
-	ContentDatetime time.Time `db:"content_datetime"`
-	OriginalName    string    `db:"original_name"` // COALESCE(original_name,'') applied in SQL
-	MIMEType        string    `db:"mime_type"`
-}
-
-// ---------------------------------------------------------------------------
-// Converters
-// ---------------------------------------------------------------------------
-
-func toFile(r fileRow) domain.File {
-	return domain.File{
-		ID:              r.ID,
-		OriginalName:    r.OriginalName,
-		MIMEType:        r.MIMEType,
-		MIMEExtension:   r.MIMEExtension,
-		ContentDatetime: r.ContentDatetime,
-		Notes:           r.Notes,
-		Metadata:        r.Metadata,
-		EXIF:            r.EXIF,
-		PHash:           r.PHash,
-		CreatorID:       r.CreatorID,
-		CreatorName:     r.CreatorName,
-		IsPublic:        r.IsPublic,
-		IsDeleted:       r.IsDeleted,
-		CreatedAt:       domain.UUIDCreatedAt(r.ID),
-	}
-}
-
-func toTagFromFileTag(r fileTagRow) domain.Tag {
-	return domain.Tag{
-		ID:            r.ID,
-		Name:          r.Name,
-		Notes:         r.Notes,
-		Color:         r.Color,
-		CategoryID:    r.CategoryID,
-		CategoryName:  r.CategoryName,
-		CategoryColor: r.CategoryColor,
-		Metadata:      r.Metadata,
-		CreatorID:     r.CreatorID,
-		CreatorName:   r.CreatorName,
-		IsPublic:      r.IsPublic,
-		CreatedAt:     domain.UUIDCreatedAt(r.ID),
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Cursor
-// ---------------------------------------------------------------------------
-
-type fileCursor struct {
-	Sort  string `json:"s"`  // canonical sort name
-	Order string `json:"o"`  // "ASC" or "DESC"
-	ID    string `json:"id"` // UUID of the boundary file
-	Val   string `json:"v"`  // sort column value; empty for "created" (id IS the key)
-}
-
-func encodeCursor(c fileCursor) string {
-	b, _ := json.Marshal(c)
-	return base64.RawURLEncoding.EncodeToString(b)
-}
-
-func decodeCursor(s string) (fileCursor, error) {
-	b, err := base64.RawURLEncoding.DecodeString(s)
-	if err != nil {
-		return fileCursor{}, fmt.Errorf("cursor: invalid encoding")
-	}
-	var c fileCursor
-	if err := json.Unmarshal(b, &c); err != nil {
-		return fileCursor{}, fmt.Errorf("cursor: invalid format")
-	}
-	return c, nil
-}
-
-// makeCursor builds a fileCursor from a boundary row and the current sort/order.
-func makeCursor(r fileRow, sort, order string) fileCursor {
-	var val string
-	switch sort {
-	case "content_datetime":
-		val = r.ContentDatetime.UTC().Format(time.RFC3339Nano)
-	case "original_name":
-		if r.OriginalName != nil {
-			val = *r.OriginalName
-		}
-	case "mime":
-		val = r.MIMEType
-	// "created": val is empty; f.id is the sort key.
-	}
-	return fileCursor{Sort: sort, Order: order, ID: r.ID.String(), Val: val}
-}
-
-// ---------------------------------------------------------------------------
-// Sort helpers
-// ---------------------------------------------------------------------------
-
-func normSort(s string) string {
-	switch s {
-	case "content_datetime", "original_name", "mime":
-		return s
-	default:
-		return "created"
-	}
-}
-
-func normOrder(o string) string {
-	if strings.EqualFold(o, "asc") {
-		return "ASC"
-	}
-	return "DESC"
-}
-
-// buildKeysetCond returns a keyset WHERE fragment and an ORDER BY fragment.
-//
-//   - forward=true:  items after the cursor in the sort order (standard next-page)
-//   - forward=false: items before the cursor (previous-page); ORDER BY is reversed,
-//     caller must reverse the result slice after fetching
-//   - incl=true: include the cursor file itself (anchor case; uses ≤ / ≥)
-//
-// All user values are bound as parameters — no SQL injection possible.
-func buildKeysetCond(
-	sort, order string,
-	forward, incl bool,
-	cursorID uuid.UUID, cursorVal string,
-	n int, args []any,
-) (where, orderBy string, nextN int, outArgs []any) {
-	// goDown=true → want smaller values → primary comparison is "<".
-	// Applies for DESC+forward and ASC+backward.
-	goDown := (order == "DESC") == forward
-
-	var op, idOp string
-	if goDown {
-		op = "<"
-		if incl {
-			idOp = "<="
-		} else {
-			idOp = "<"
-		}
-	} else {
-		op = ">"
-		if incl {
-			idOp = ">="
-		} else {
-			idOp = ">"
-		}
-	}
-
-	// Effective ORDER BY direction: reversed for backward so the DB returns
-	// the closest items first (the ones we keep after trimming the extra).
-	dir := order
-	if !forward {
-		if order == "DESC" {
-			dir = "ASC"
-		} else {
-			dir = "DESC"
-		}
-	}
-
-	switch sort {
-	case "created":
-		// Single-column keyset: f.id (UUID v7, so ordering = chronological).
-		where = fmt.Sprintf("f.id %s $%d", idOp, n)
-		orderBy = fmt.Sprintf("f.id %s", dir)
-		outArgs = append(args, cursorID)
-		n++
-
-	case "content_datetime":
-		// Two-column keyset: (content_datetime, id).
-		// $n is referenced twice in the SQL (< and =) but passed once in args —
-		// PostgreSQL extended protocol allows multiple references to $N.
-		t, _ := time.Parse(time.RFC3339Nano, cursorVal)
-		where = fmt.Sprintf(
-			"(f.content_datetime %s $%d OR (f.content_datetime = $%d AND f.id %s $%d))",
-			op, n, n, idOp, n+1)
-		orderBy = fmt.Sprintf("f.content_datetime %s, f.id %s", dir, dir)
-		outArgs = append(args, t, cursorID)
-		n += 2
-
-	case "original_name":
-		// COALESCE treats NULL names as '' for stable pagination.
-		where = fmt.Sprintf(
-			"(COALESCE(f.original_name,'') %s $%d OR (COALESCE(f.original_name,'') = $%d AND f.id %s $%d))",
-			op, n, n, idOp, n+1)
-		orderBy = fmt.Sprintf("COALESCE(f.original_name,'') %s, f.id %s", dir, dir)
-		outArgs = append(args, cursorVal, cursorID)
-		n += 2
-
-	default: // "mime"
-		where = fmt.Sprintf(
-			"(mt.name %s $%d OR (mt.name = $%d AND f.id %s $%d))",
-			op, n, n, idOp, n+1)
-		orderBy = fmt.Sprintf("mt.name %s, f.id %s", dir, dir)
-		outArgs = append(args, cursorVal, cursorID)
-		n += 2
-	}
-
-	nextN = n
-	return
-}
-
-// defaultOrderBy returns the natural ORDER BY for the first page (no cursor).
-func defaultOrderBy(sort, order string) string {
-	switch sort {
-	case "created":
-		return fmt.Sprintf("f.id %s", order)
-	case "content_datetime":
-		return fmt.Sprintf("f.content_datetime %s, f.id %s", order, order)
-	case "original_name":
-		return fmt.Sprintf("COALESCE(f.original_name,'') %s, f.id %s", order, order)
-	default: // "mime"
-		return fmt.Sprintf("mt.name %s, f.id %s", order, order)
-	}
-}
-
-// ---------------------------------------------------------------------------
-// FileRepo
-// ---------------------------------------------------------------------------
-
-// FileRepo implements port.FileRepo using PostgreSQL.
-type FileRepo struct {
-	pool *pgxpool.Pool
-}
-
-// NewFileRepo creates a FileRepo backed by pool.
-func NewFileRepo(pool *pgxpool.Pool) *FileRepo {
-	return &FileRepo{pool: pool}
-}
-
-var _ port.FileRepo = (*FileRepo)(nil)
-
-// fileSelectCTE is the SELECT appended after a CTE named "r" that exposes
-// all file columns (including mime_id). Used by Create, Update, and Restore
-// to get the full denormalized record in a single round-trip.
-const fileSelectCTE = `
-    SELECT r.id, r.original_name,
-           mt.name AS mime_type, mt.extension AS mime_extension,
-           r.content_datetime, r.notes, r.metadata, r.exif, r.phash,
-           r.creator_id, u.name AS creator_name,
-           r.is_public, r.is_deleted
-    FROM r
-    JOIN core.mime_types mt ON mt.id = r.mime_id
-    JOIN core.users u       ON u.id  = r.creator_id`
-
-// ---------------------------------------------------------------------------
-// Create
-// ---------------------------------------------------------------------------
-
-// Create inserts a new file record using the ID already set on f.
-// The MIME type is resolved from f.MIMEType (name string) via a subquery.
-func (r *FileRepo) Create(ctx context.Context, f *domain.File) (*domain.File, error) {
-	const sqlStr = `
-        WITH r AS (
-            INSERT INTO data.files
-                (id, original_name, mime_id, content_datetime, notes, metadata, exif, phash, creator_id, is_public)
-            VALUES (
-                $1,
-                $2,
-                (SELECT id FROM core.mime_types WHERE name = $3),
-                $4, $5, $6, $7, $8, $9, $10
-            )
-            RETURNING id, original_name, mime_id, content_datetime, notes,
-                      metadata, exif, phash, creator_id, is_public, is_deleted
-        )` + fileSelectCTE
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sqlStr,
-		f.ID, f.OriginalName, f.MIMEType, f.ContentDatetime,
-		f.Notes, f.Metadata, f.EXIF, f.PHash,
-		f.CreatorID, f.IsPublic,
-	)
-	if err != nil {
-		return nil, fmt.Errorf("FileRepo.Create: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[fileRow])
-	if err != nil {
-		return nil, fmt.Errorf("FileRepo.Create scan: %w", err)
-	}
-	created := toFile(row)
-	return &created, nil
-}
-
-// ---------------------------------------------------------------------------
-// GetByID
-// ---------------------------------------------------------------------------
-
-func (r *FileRepo) GetByID(ctx context.Context, id uuid.UUID) (*domain.File, error) {
-	const sqlStr = `
-        SELECT f.id, f.original_name,
-               mt.name AS mime_type, mt.extension AS mime_extension,
-               f.content_datetime, f.notes, f.metadata, f.exif, f.phash,
-               f.creator_id, u.name AS creator_name,
-               f.is_public, f.is_deleted
-        FROM data.files f
-        JOIN core.mime_types mt ON mt.id = f.mime_id
-        JOIN core.users u       ON u.id  = f.creator_id
-        WHERE f.id = $1`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sqlStr, id)
-	if err != nil {
-		return nil, fmt.Errorf("FileRepo.GetByID: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[fileRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("FileRepo.GetByID scan: %w", err)
-	}
-	f := toFile(row)
-	tags, err := r.ListTags(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-	f.Tags = tags
-	return &f, nil
-}
-
-// ---------------------------------------------------------------------------
-// Update
-// ---------------------------------------------------------------------------
-
-// Update applies editable metadata fields. MIME type and EXIF are immutable.
-func (r *FileRepo) Update(ctx context.Context, id uuid.UUID, f *domain.File) (*domain.File, error) {
-	const sqlStr = `
-        WITH r AS (
-            UPDATE data.files
-            SET original_name    = $2,
-                content_datetime = $3,
-                notes            = $4,
-                metadata         = $5,
-                is_public        = $6
-            WHERE id = $1
-            RETURNING id, original_name, mime_id, content_datetime, notes,
-                      metadata, exif, phash, creator_id, is_public, is_deleted
-        )` + fileSelectCTE
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sqlStr,
-		id, f.OriginalName, f.ContentDatetime,
-		f.Notes, f.Metadata, f.IsPublic,
-	)
-	if err != nil {
-		return nil, fmt.Errorf("FileRepo.Update: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[fileRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("FileRepo.Update scan: %w", err)
-	}
-	updated := toFile(row)
-	tags, err := r.ListTags(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-	updated.Tags = tags
-	return &updated, nil
-}
-
-// ---------------------------------------------------------------------------
-// SoftDelete / Restore / DeletePermanent
-// ---------------------------------------------------------------------------
-
-// SoftDelete moves a file to trash (is_deleted = true). Returns ErrNotFound
-// if the file does not exist or is already in trash.
-func (r *FileRepo) SoftDelete(ctx context.Context, id uuid.UUID) error {
-	const sqlStr = `UPDATE data.files SET is_deleted = true WHERE id = $1 AND is_deleted = false`
-	q := connOrTx(ctx, r.pool)
-	tag, err := q.Exec(ctx, sqlStr, id)
-	if err != nil {
-		return fmt.Errorf("FileRepo.SoftDelete: %w", err)
-	}
-	if tag.RowsAffected() == 0 {
-		return domain.ErrNotFound
-	}
-	return nil
-}
-
-// Restore moves a file out of trash (is_deleted = false). Returns ErrNotFound
-// if the file does not exist or is not in trash.
-func (r *FileRepo) Restore(ctx context.Context, id uuid.UUID) (*domain.File, error) {
-	const sqlStr = `
-        WITH r AS (
-            UPDATE data.files
-            SET is_deleted = false
-            WHERE id = $1 AND is_deleted = true
-            RETURNING id, original_name, mime_id, content_datetime, notes,
-                      metadata, exif, phash, creator_id, is_public, is_deleted
-        )` + fileSelectCTE
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sqlStr, id)
-	if err != nil {
-		return nil, fmt.Errorf("FileRepo.Restore: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[fileRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("FileRepo.Restore scan: %w", err)
-	}
-	restored := toFile(row)
-	tags, err := r.ListTags(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-	restored.Tags = tags
-	return &restored, nil
-}
-
-// DeletePermanent removes a file record permanently. Only allowed when the
-// file is already in trash (is_deleted = true).
-func (r *FileRepo) DeletePermanent(ctx context.Context, id uuid.UUID) error {
-	const sqlStr = `DELETE FROM data.files WHERE id = $1 AND is_deleted = true`
-	q := connOrTx(ctx, r.pool)
-	tag, err := q.Exec(ctx, sqlStr, id)
-	if err != nil {
-		return fmt.Errorf("FileRepo.DeletePermanent: %w", err)
-	}
-	if tag.RowsAffected() == 0 {
-		return domain.ErrNotFound
-	}
-	return nil
-}
-
-// ---------------------------------------------------------------------------
-// ListTags / SetTags
-// ---------------------------------------------------------------------------
-
-// ListTags returns all tags assigned to a file, ordered by tag name.
-func (r *FileRepo) ListTags(ctx context.Context, fileID uuid.UUID) ([]domain.Tag, error) {
-	m, err := r.loadTagsBatch(ctx, []uuid.UUID{fileID})
-	if err != nil {
-		return nil, err
-	}
-	return m[fileID], nil
-}
-
-// SetTags replaces all tags on a file (full replace semantics).
-func (r *FileRepo) SetTags(ctx context.Context, fileID uuid.UUID, tagIDs []uuid.UUID) error {
-	q := connOrTx(ctx, r.pool)
-	const del = `DELETE FROM data.file_tag WHERE file_id = $1`
-	if _, err := q.Exec(ctx, del, fileID); err != nil {
-		return fmt.Errorf("FileRepo.SetTags delete: %w", err)
-	}
-	if len(tagIDs) == 0 {
-		return nil
-	}
-	const ins = `INSERT INTO data.file_tag (file_id, tag_id) VALUES ($1, $2)`
-	for _, tagID := range tagIDs {
-		if _, err := q.Exec(ctx, ins, fileID, tagID); err != nil {
-			return fmt.Errorf("FileRepo.SetTags insert: %w", err)
-		}
-	}
-	return nil
-}
-
-// ---------------------------------------------------------------------------
-// List
-// ---------------------------------------------------------------------------
-
-// List returns a cursor-paginated page of files.
-//
-// Pagination is keyset-based for stable performance on large tables.
-// Cursor encodes the sort position; the caller provides direction.
-// Anchor mode centres the result around a specific file UUID.
-func (r *FileRepo) List(ctx context.Context, params domain.FileListParams) (*domain.FilePage, error) {
-	sort := normSort(params.Sort)
-	order := normOrder(params.Order)
-	forward := params.Direction != "backward"
-	limit := db.ClampLimit(params.Limit, 50, 200)
-
-	// --- resolve cursor / anchor ---
-	var (
-		cursorID  uuid.UUID
-		cursorVal string
-		hasCursor bool
-		isAnchor  bool
-	)
-
-	switch {
-	case params.Cursor != "":
-		cur, err := decodeCursor(params.Cursor)
-		if err != nil {
-			return nil, fmt.Errorf("%w: %v", domain.ErrValidation, err)
-		}
-		id, err := uuid.Parse(cur.ID)
-		if err != nil {
-			return nil, domain.ErrValidation
-		}
-		// Lock in the sort/order encoded in the cursor so changing query
-		// parameters mid-session doesn't corrupt pagination.
-		sort = normSort(cur.Sort)
-		order = normOrder(cur.Order)
-		cursorID = id
-		cursorVal = cur.Val
-		hasCursor = true
-
-	case params.Anchor != nil:
-		av, err := r.fetchAnchorVals(ctx, *params.Anchor)
-		if err != nil {
-			return nil, err
-		}
-		cursorID = *params.Anchor
-		switch sort {
-		case "content_datetime":
-			cursorVal = av.ContentDatetime.UTC().Format(time.RFC3339Nano)
-		case "original_name":
-			cursorVal = av.OriginalName
-		case "mime":
-			cursorVal = av.MIMEType
-		// "created": cursorVal stays ""; cursorID is the sort key.
-		}
-		hasCursor = true
-		isAnchor = true
-	}
-
-	// Without a cursor there is no meaningful "backward" direction.
-	if !hasCursor {
-		forward = true
-	}
-
-	// --- build WHERE and ORDER BY ---
-	var conds []string
-	args := make([]any, 0, 8)
-	n := 1
-
-	conds = append(conds, fmt.Sprintf("f.is_deleted = $%d", n))
-	args = append(args, params.Trash)
-	n++
-
-	if params.Search != "" {
-		conds = append(conds, fmt.Sprintf("f.original_name ILIKE $%d", n))
-		args = append(args, "%"+params.Search+"%")
-		n++
-	}
-
-	if params.Filter != "" {
-		filterSQL, nextN, filterArgs, err := ParseFilter(params.Filter, n)
-		if err != nil {
-			return nil, fmt.Errorf("%w: %v", domain.ErrValidation, err)
-		}
-		if filterSQL != "" {
-			conds = append(conds, filterSQL)
-			n = nextN
-			args = append(args, filterArgs...)
-		}
-	}
-
-	var orderBy string
-	if hasCursor {
-		ksWhere, ksOrder, nextN, ksArgs := buildKeysetCond(
-			sort, order, forward, isAnchor, cursorID, cursorVal, n, args)
-		conds = append(conds, ksWhere)
-		n = nextN
-		args = ksArgs
-		orderBy = ksOrder
-	} else {
-		orderBy = defaultOrderBy(sort, order)
-	}
-
-	where := ""
-	if len(conds) > 0 {
-		where = "WHERE " + strings.Join(conds, " AND ")
-	}
-
-	// Fetch one extra row to detect whether more items exist beyond this page.
-	args = append(args, limit+1)
-	sqlStr := fmt.Sprintf(`
-        SELECT f.id, f.original_name,
-               mt.name AS mime_type, mt.extension AS mime_extension,
-               f.content_datetime, f.notes, f.metadata, f.exif, f.phash,
-               f.creator_id, u.name AS creator_name,
-               f.is_public, f.is_deleted
-        FROM data.files f
-        JOIN core.mime_types mt ON mt.id = f.mime_id
-        JOIN core.users u       ON u.id  = f.creator_id
-        %s
-        ORDER BY %s
-        LIMIT $%d`, where, orderBy, n)
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sqlStr, args...)
-	if err != nil {
-		return nil, fmt.Errorf("FileRepo.List: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[fileRow])
-	if err != nil {
-		return nil, fmt.Errorf("FileRepo.List scan: %w", err)
-	}
-
-	// --- trim extra row and reverse for backward ---
-	hasMore := len(collected) > limit
-	if hasMore {
-		collected = collected[:limit]
-	}
-	if !forward {
-		// Results were fetched in reversed ORDER BY; invert to restore the
-		// natural sort order expected by the caller.
-		for i, j := 0, len(collected)-1; i < j; i, j = i+1, j-1 {
-			collected[i], collected[j] = collected[j], collected[i]
-		}
-	}
-
-	// --- assemble page ---
-	page := &domain.FilePage{
-		Items: make([]domain.File, len(collected)),
-	}
-	for i, row := range collected {
-		page.Items[i] = toFile(row)
-	}
-
-	// --- set next/prev cursors ---
-	// next_cursor: navigate further in the forward direction.
-	// prev_cursor: navigate further in the backward direction.
-	if len(collected) > 0 {
-		firstCur := encodeCursor(makeCursor(collected[0], sort, order))
-		lastCur := encodeCursor(makeCursor(collected[len(collected)-1], sort, order))
-
-		if forward {
-			// We only know a prev page exists if we arrived via cursor.
-			if hasCursor {
-				page.PrevCursor = &firstCur
-			}
-			if hasMore {
-				page.NextCursor = &lastCur
-			}
-		} else {
-			// Backward: last item (after reversal) is closest to original cursor.
-			if hasCursor {
-				page.NextCursor = &lastCur
-			}
-			if hasMore {
-				page.PrevCursor = &firstCur
-			}
-		}
-	}
-
-	// --- batch-load tags ---
-	if len(page.Items) > 0 {
-		fileIDs := make([]uuid.UUID, len(page.Items))
-		for i, f := range page.Items {
-			fileIDs[i] = f.ID
-		}
-		tagMap, err := r.loadTagsBatch(ctx, fileIDs)
-		if err != nil {
-			return nil, err
-		}
-		for i, f := range page.Items {
-			page.Items[i].Tags = tagMap[f.ID] // nil becomes []domain.Tag{} via loadTagsBatch
-		}
-	}
-
-	return page, nil
-}
-
-// ---------------------------------------------------------------------------
-// Internal helpers
-// ---------------------------------------------------------------------------
-
-// fetchAnchorVals returns the sort-column values for the given file.
-// Used to set up a cursor when the caller provides an anchor UUID.
-func (r *FileRepo) fetchAnchorVals(ctx context.Context, fileID uuid.UUID) (*anchorValRow, error) {
-	const sqlStr = `
-        SELECT f.content_datetime,
-               COALESCE(f.original_name, '') AS original_name,
-               mt.name AS mime_type
-        FROM data.files f
-        JOIN core.mime_types mt ON mt.id = f.mime_id
-        WHERE f.id = $1`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sqlStr, fileID)
-	if err != nil {
-		return nil, fmt.Errorf("FileRepo.fetchAnchorVals: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[anchorValRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("FileRepo.fetchAnchorVals scan: %w", err)
-	}
-	return &row, nil
-}
-
-// loadTagsBatch fetches tags for multiple files in a single query and returns
-// them as a map keyed by file ID. Every requested file ID appears as a key
-// (with an empty slice if the file has no tags).
-func (r *FileRepo) loadTagsBatch(ctx context.Context, fileIDs []uuid.UUID) (map[uuid.UUID][]domain.Tag, error) {
-	if len(fileIDs) == 0 {
-		return nil, nil
-	}
-
-	// Build a parameterised IN list. The max page size is 200, so at most 200
-	// placeholders — well within PostgreSQL's limits.
-	placeholders := make([]string, len(fileIDs))
-	args := make([]any, len(fileIDs))
-	for i, id := range fileIDs {
-		placeholders[i] = fmt.Sprintf("$%d", i+1)
-		args[i] = id
-	}
-
-	sqlStr := fmt.Sprintf(`
-        SELECT ft.file_id,
-               t.id, t.name, t.notes, t.color,
-               t.category_id,
-               c.name  AS category_name,
-               c.color AS category_color,
-               t.metadata, t.creator_id, u.name AS creator_name, t.is_public
-        FROM data.file_tag ft
-        JOIN  data.tags t           ON t.id = ft.tag_id
-        JOIN  core.users u          ON u.id = t.creator_id
-        LEFT JOIN data.categories c ON c.id = t.category_id
-        WHERE ft.file_id IN (%s)
-        ORDER BY ft.file_id, t.name`, strings.Join(placeholders, ","))
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sqlStr, args...)
-	if err != nil {
-		return nil, fmt.Errorf("FileRepo.loadTagsBatch: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[fileTagRow])
-	if err != nil {
-		return nil, fmt.Errorf("FileRepo.loadTagsBatch scan: %w", err)
-	}
-
-	result := make(map[uuid.UUID][]domain.Tag, len(fileIDs))
-	for _, fid := range fileIDs {
-		result[fid] = []domain.Tag{} // guarantee every key has a non-nil slice
-	}
-	for _, row := range collected {
-		result[row.FileID] = append(result[row.FileID], toTagFromFileTag(row))
-	}
-	return result, nil
-}
--- a/backend/internal/db/postgres/filter_parser.go
+++ b/backend/internal/db/postgres/filter_parser.go
@ -1,286 +0,0 @@
-package postgres
-
-import (
-	"fmt"
-	"strconv"
-	"strings"
-
-	"github.com/google/uuid"
-)
-
-// ---------------------------------------------------------------------------
-// Token types
-// ---------------------------------------------------------------------------
-
-type filterTokenKind int
-
-const (
-	ftkAnd       filterTokenKind = iota
-	ftkOr
-	ftkNot
-	ftkLParen
-	ftkRParen
-	ftkTag       // t=<uuid>
-	ftkMimeExact // m=<int>
-	ftkMimeLike  // m~<pattern>
-)
-
-type filterToken struct {
-	kind     filterTokenKind
-	tagID    uuid.UUID // ftkTag
-	untagged bool      // ftkTag with zero UUID → "file has no tags"
-	mimeID   int16     // ftkMimeExact
-	pattern  string    // ftkMimeLike
-}
-
-// ---------------------------------------------------------------------------
-// AST nodes
-// ---------------------------------------------------------------------------
-
-// filterNode produces a parameterized SQL fragment.
-// n is the index of the next available positional parameter ($n).
-// Returns the fragment, the updated n, and the extended args slice.
-type filterNode interface {
-	toSQL(n int, args []any) (string, int, []any)
-}
-
-type andNode  struct{ left, right filterNode }
-type orNode   struct{ left, right filterNode }
-type notNode  struct{ child filterNode }
-type leafNode struct{ tok filterToken }
-
-func (a *andNode) toSQL(n int, args []any) (string, int, []any) {
-	ls, n, args := a.left.toSQL(n, args)
-	rs, n, args := a.right.toSQL(n, args)
-	return "(" + ls + " AND " + rs + ")", n, args
-}
-
-func (o *orNode) toSQL(n int, args []any) (string, int, []any) {
-	ls, n, args := o.left.toSQL(n, args)
-	rs, n, args := o.right.toSQL(n, args)
-	return "(" + ls + " OR " + rs + ")", n, args
-}
-
-func (no *notNode) toSQL(n int, args []any) (string, int, []any) {
-	cs, n, args := no.child.toSQL(n, args)
-	return "(NOT " + cs + ")", n, args
-}
-
-func (l *leafNode) toSQL(n int, args []any) (string, int, []any) {
-	switch l.tok.kind {
-	case ftkTag:
-		if l.tok.untagged {
-			return "NOT EXISTS (SELECT 1 FROM data.file_tag ft WHERE ft.file_id = f.id)", n, args
-		}
-		s := fmt.Sprintf(
-			"EXISTS (SELECT 1 FROM data.file_tag ft WHERE ft.file_id = f.id AND ft.tag_id = $%d)", n)
-		return s, n + 1, append(args, l.tok.tagID)
-	case ftkMimeExact:
-		return fmt.Sprintf("f.mime_id = $%d", n), n + 1, append(args, l.tok.mimeID)
-	case ftkMimeLike:
-		// mt alias comes from the JOIN in the main file query (always present).
-		return fmt.Sprintf("mt.name LIKE $%d", n), n + 1, append(args, l.tok.pattern)
-	}
-	panic("filterNode.toSQL: unknown leaf kind")
-}
-
-// ---------------------------------------------------------------------------
-// Lexer
-// ---------------------------------------------------------------------------
-
-// lexFilter tokenises the DSL string {a,b,c,...} into filterTokens.
-func lexFilter(dsl string) ([]filterToken, error) {
-	dsl = strings.TrimSpace(dsl)
-	if !strings.HasPrefix(dsl, "{") || !strings.HasSuffix(dsl, "}") {
-		return nil, fmt.Errorf("filter DSL must be wrapped in braces: {…}")
-	}
-	inner := strings.TrimSpace(dsl[1 : len(dsl)-1])
-	if inner == "" {
-		return nil, nil
-	}
-
-	parts := strings.Split(inner, ",")
-	tokens := make([]filterToken, 0, len(parts))
-
-	for _, raw := range parts {
-		p := strings.TrimSpace(raw)
-		switch {
-		case p == "&":
-			tokens = append(tokens, filterToken{kind: ftkAnd})
-		case p == "|":
-			tokens = append(tokens, filterToken{kind: ftkOr})
-		case p == "!":
-			tokens = append(tokens, filterToken{kind: ftkNot})
-		case p == "(":
-			tokens = append(tokens, filterToken{kind: ftkLParen})
-		case p == ")":
-			tokens = append(tokens, filterToken{kind: ftkRParen})
-		case strings.HasPrefix(p, "t="):
-			id, err := uuid.Parse(p[2:])
-			if err != nil {
-				return nil, fmt.Errorf("filter: invalid tag UUID %q", p[2:])
-			}
-			tokens = append(tokens, filterToken{kind: ftkTag, tagID: id, untagged: id == uuid.Nil})
-		case strings.HasPrefix(p, "m="):
-			v, err := strconv.ParseInt(p[2:], 10, 16)
-			if err != nil {
-				return nil, fmt.Errorf("filter: invalid MIME ID %q", p[2:])
-			}
-			tokens = append(tokens, filterToken{kind: ftkMimeExact, mimeID: int16(v)})
-		case strings.HasPrefix(p, "m~"):
-			// The pattern value is passed as a query parameter, so no SQL injection risk.
-			tokens = append(tokens, filterToken{kind: ftkMimeLike, pattern: p[2:]})
-		default:
-			return nil, fmt.Errorf("filter: unknown token %q", p)
-		}
-	}
-	return tokens, nil
-}
-
-// ---------------------------------------------------------------------------
-// Recursive-descent parser
-// ---------------------------------------------------------------------------
-
-type filterParser struct {
-	tokens []filterToken
-	pos    int
-}
-
-func (p *filterParser) peek() (filterToken, bool) {
-	if p.pos >= len(p.tokens) {
-		return filterToken{}, false
-	}
-	return p.tokens[p.pos], true
-}
-
-func (p *filterParser) next() filterToken {
-	t := p.tokens[p.pos]
-	p.pos++
-	return t
-}
-
-// Grammar (standard NOT > AND > OR precedence):
-//
-//	expr     := or_expr
-//	or_expr  := and_expr ('|' and_expr)*
-//	and_expr := not_expr ('&' not_expr)*
-//	not_expr := '!' not_expr | atom
-//	atom     := '(' expr ')' | leaf
-
-func (p *filterParser) parseExpr() (filterNode, error) { return p.parseOr() }
-
-func (p *filterParser) parseOr() (filterNode, error) {
-	left, err := p.parseAnd()
-	if err != nil {
-		return nil, err
-	}
-	for {
-		t, ok := p.peek()
-		if !ok || t.kind != ftkOr {
-			break
-		}
-		p.next()
-		right, err := p.parseAnd()
-		if err != nil {
-			return nil, err
-		}
-		left = &orNode{left, right}
-	}
-	return left, nil
-}
-
-func (p *filterParser) parseAnd() (filterNode, error) {
-	left, err := p.parseNot()
-	if err != nil {
-		return nil, err
-	}
-	for {
-		t, ok := p.peek()
-		if !ok || t.kind != ftkAnd {
-			break
-		}
-		p.next()
-		right, err := p.parseNot()
-		if err != nil {
-			return nil, err
-		}
-		left = &andNode{left, right}
-	}
-	return left, nil
-}
-
-func (p *filterParser) parseNot() (filterNode, error) {
-	t, ok := p.peek()
-	if ok && t.kind == ftkNot {
-		p.next()
-		child, err := p.parseNot() // right-recursive to allow !!x
-		if err != nil {
-			return nil, err
-		}
-		return &notNode{child}, nil
-	}
-	return p.parseAtom()
-}
-
-func (p *filterParser) parseAtom() (filterNode, error) {
-	t, ok := p.peek()
-	if !ok {
-		return nil, fmt.Errorf("filter: unexpected end of expression")
-	}
-	if t.kind == ftkLParen {
-		p.next()
-		expr, err := p.parseExpr()
-		if err != nil {
-			return nil, err
-		}
-		rp, ok := p.peek()
-		if !ok || rp.kind != ftkRParen {
-			return nil, fmt.Errorf("filter: expected ')'")
-		}
-		p.next()
-		return expr, nil
-	}
-	switch t.kind {
-	case ftkTag, ftkMimeExact, ftkMimeLike:
-		p.next()
-		return &leafNode{t}, nil
-	default:
-		return nil, fmt.Errorf("filter: unexpected token at position %d", p.pos)
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Public entry point
-// ---------------------------------------------------------------------------
-
-// ParseFilter parses a filter DSL string into a parameterized SQL fragment.
-//
-// argStart is the 1-based index for the first $N placeholder; this lets the
-// caller interleave filter parameters with other query parameters.
-//
-// Returns ("", argStart, nil, nil) for an empty or trivial DSL.
-// SQL injection is structurally impossible: every user-supplied value is
-// bound as a query parameter ($N), never interpolated into the SQL string.
-func ParseFilter(dsl string, argStart int) (sql string, nextN int, args []any, err error) {
-	dsl = strings.TrimSpace(dsl)
-	if dsl == "" || dsl == "{}" {
-		return "", argStart, nil, nil
-	}
-	toks, err := lexFilter(dsl)
-	if err != nil {
-		return "", argStart, nil, err
-	}
-	if len(toks) == 0 {
-		return "", argStart, nil, nil
-	}
-	p := &filterParser{tokens: toks}
-	node, err := p.parseExpr()
-	if err != nil {
-		return "", argStart, nil, err
-	}
-	if p.pos != len(p.tokens) {
-		return "", argStart, nil, fmt.Errorf("filter: trailing tokens at position %d", p.pos)
-	}
-	sql, nextN, args = node.toSQL(argStart, nil)
-	return sql, nextN, args, nil
-}
--- a/backend/internal/db/postgres/mime_repo.go
+++ b/backend/internal/db/postgres/mime_repo.go
@ -1,97 +0,0 @@
-package postgres
-
-import (
-	"context"
-	"errors"
-	"fmt"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-type mimeRow struct {
-	ID        int16  `db:"id"`
-	Name      string `db:"name"`
-	Extension string `db:"extension"`
-}
-
-func toMIMEType(r mimeRow) domain.MIMEType {
-	return domain.MIMEType{
-		ID:        r.ID,
-		Name:      r.Name,
-		Extension: r.Extension,
-	}
-}
-
-// MimeRepo implements port.MimeRepo using PostgreSQL.
-type MimeRepo struct {
-	pool *pgxpool.Pool
-}
-
-// NewMimeRepo creates a MimeRepo backed by pool.
-func NewMimeRepo(pool *pgxpool.Pool) *MimeRepo {
-	return &MimeRepo{pool: pool}
-}
-
-var _ port.MimeRepo = (*MimeRepo)(nil)
-
-func (r *MimeRepo) List(ctx context.Context) ([]domain.MIMEType, error) {
-	const sql = `SELECT id, name, extension FROM core.mime_types ORDER BY name`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql)
-	if err != nil {
-		return nil, fmt.Errorf("MimeRepo.List: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[mimeRow])
-	if err != nil {
-		return nil, fmt.Errorf("MimeRepo.List scan: %w", err)
-	}
-
-	result := make([]domain.MIMEType, len(collected))
-	for i, row := range collected {
-		result[i] = toMIMEType(row)
-	}
-	return result, nil
-}
-
-func (r *MimeRepo) GetByID(ctx context.Context, id int16) (*domain.MIMEType, error) {
-	const sql = `SELECT id, name, extension FROM core.mime_types WHERE id = $1`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, id)
-	if err != nil {
-		return nil, fmt.Errorf("MimeRepo.GetByID: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[mimeRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("MimeRepo.GetByID scan: %w", err)
-	}
-	m := toMIMEType(row)
-	return &m, nil
-}
-
-func (r *MimeRepo) GetByName(ctx context.Context, name string) (*domain.MIMEType, error) {
-	const sql = `SELECT id, name, extension FROM core.mime_types WHERE name = $1`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, name)
-	if err != nil {
-		return nil, fmt.Errorf("MimeRepo.GetByName: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[mimeRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrUnsupportedMIME
-		}
-		return nil, fmt.Errorf("MimeRepo.GetByName scan: %w", err)
-	}
-	m := toMIMEType(row)
-	return &m, nil
-}
--- a/backend/internal/db/postgres/pool_repo.go
+++ b/backend/internal/db/postgres/pool_repo.go
@ -1,665 +0,0 @@
-package postgres
-
-import (
-	"context"
-	"encoding/base64"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"strings"
-	"time"
-
-	"github.com/google/uuid"
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-
-	"tanabata/backend/internal/db"
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// ---------------------------------------------------------------------------
-// Row structs
-// ---------------------------------------------------------------------------
-
-type poolRow struct {
-	ID          uuid.UUID `db:"id"`
-	Name        string    `db:"name"`
-	Notes       *string   `db:"notes"`
-	Metadata    []byte    `db:"metadata"`
-	CreatorID   int16     `db:"creator_id"`
-	CreatorName string    `db:"creator_name"`
-	IsPublic    bool      `db:"is_public"`
-	FileCount   int       `db:"file_count"`
-}
-
-type poolRowWithTotal struct {
-	poolRow
-	Total int `db:"total"`
-}
-
-// poolFileRow is a flat struct combining all file columns plus pool position.
-type poolFileRow struct {
-	ID              uuid.UUID       `db:"id"`
-	OriginalName    *string         `db:"original_name"`
-	MIMEType        string          `db:"mime_type"`
-	MIMEExtension   string          `db:"mime_extension"`
-	ContentDatetime time.Time       `db:"content_datetime"`
-	Notes           *string         `db:"notes"`
-	Metadata        json.RawMessage `db:"metadata"`
-	EXIF            json.RawMessage `db:"exif"`
-	PHash           *int64          `db:"phash"`
-	CreatorID       int16           `db:"creator_id"`
-	CreatorName     string          `db:"creator_name"`
-	IsPublic        bool            `db:"is_public"`
-	IsDeleted       bool            `db:"is_deleted"`
-	Position        int             `db:"position"`
-}
-
-// ---------------------------------------------------------------------------
-// Converters
-// ---------------------------------------------------------------------------
-
-func toPool(r poolRow) domain.Pool {
-	p := domain.Pool{
-		ID:          r.ID,
-		Name:        r.Name,
-		Notes:       r.Notes,
-		CreatorID:   r.CreatorID,
-		CreatorName: r.CreatorName,
-		IsPublic:    r.IsPublic,
-		FileCount:   r.FileCount,
-		CreatedAt:   domain.UUIDCreatedAt(r.ID),
-	}
-	if len(r.Metadata) > 0 && string(r.Metadata) != "null" {
-		p.Metadata = json.RawMessage(r.Metadata)
-	}
-	return p
-}
-
-func toPoolFile(r poolFileRow) domain.PoolFile {
-	return domain.PoolFile{
-		File: domain.File{
-			ID:              r.ID,
-			OriginalName:    r.OriginalName,
-			MIMEType:        r.MIMEType,
-			MIMEExtension:   r.MIMEExtension,
-			ContentDatetime: r.ContentDatetime,
-			Notes:           r.Notes,
-			Metadata:        r.Metadata,
-			EXIF:            r.EXIF,
-			PHash:           r.PHash,
-			CreatorID:       r.CreatorID,
-			CreatorName:     r.CreatorName,
-			IsPublic:        r.IsPublic,
-			IsDeleted:       r.IsDeleted,
-			CreatedAt:       domain.UUIDCreatedAt(r.ID),
-		},
-		Position: r.Position,
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Cursor
-// ---------------------------------------------------------------------------
-
-type poolFileCursor struct {
-	Position int    `json:"p"`
-	FileID   string `json:"id"`
-}
-
-func encodePoolCursor(c poolFileCursor) string {
-	b, _ := json.Marshal(c)
-	return base64.RawURLEncoding.EncodeToString(b)
-}
-
-func decodePoolCursor(s string) (poolFileCursor, error) {
-	b, err := base64.RawURLEncoding.DecodeString(s)
-	if err != nil {
-		return poolFileCursor{}, fmt.Errorf("cursor: invalid encoding")
-	}
-	var c poolFileCursor
-	if err := json.Unmarshal(b, &c); err != nil {
-		return poolFileCursor{}, fmt.Errorf("cursor: invalid format")
-	}
-	return c, nil
-}
-
-// ---------------------------------------------------------------------------
-// Shared SQL
-// ---------------------------------------------------------------------------
-
-// poolCountSubquery computes per-pool file counts.
-const poolCountSubquery = `(SELECT pool_id, COUNT(*) AS cnt FROM data.file_pool GROUP BY pool_id)`
-
-const poolSelectFrom = `
-SELECT p.id, p.name, p.notes, p.metadata,
-       p.creator_id, u.name AS creator_name, p.is_public,
-       COALESCE(fc.cnt, 0) AS file_count
-FROM data.pools p
-JOIN core.users u ON u.id = p.creator_id
-LEFT JOIN ` + poolCountSubquery + ` fc ON fc.pool_id = p.id`
-
-func poolSortColumn(s string) string {
-	if s == "name" {
-		return "p.name"
-	}
-	return "p.id" // "created"
-}
-
-// ---------------------------------------------------------------------------
-// PoolRepo
-// ---------------------------------------------------------------------------
-
-// PoolRepo implements port.PoolRepo using PostgreSQL.
-type PoolRepo struct {
-	pool *pgxpool.Pool
-}
-
-var _ port.PoolRepo = (*PoolRepo)(nil)
-
-// NewPoolRepo creates a PoolRepo backed by pool.
-func NewPoolRepo(pool *pgxpool.Pool) *PoolRepo {
-	return &PoolRepo{pool: pool}
-}
-
-// ---------------------------------------------------------------------------
-// List
-// ---------------------------------------------------------------------------
-
-func (r *PoolRepo) List(ctx context.Context, params port.OffsetParams) (*domain.PoolOffsetPage, error) {
-	order := "ASC"
-	if strings.ToLower(params.Order) == "desc" {
-		order = "DESC"
-	}
-	sortCol := poolSortColumn(params.Sort)
-
-	args := []any{}
-	n := 1
-	var conditions []string
-
-	if params.Search != "" {
-		conditions = append(conditions, fmt.Sprintf("lower(p.name) LIKE lower($%d)", n))
-		args = append(args, "%"+params.Search+"%")
-		n++
-	}
-
-	where := ""
-	if len(conditions) > 0 {
-		where = "WHERE " + strings.Join(conditions, " AND ")
-	}
-
-	limit := params.Limit
-	if limit <= 0 {
-		limit = 50
-	}
-	offset := params.Offset
-	if offset < 0 {
-		offset = 0
-	}
-
-	query := fmt.Sprintf(`
-SELECT p.id, p.name, p.notes, p.metadata,
-       p.creator_id, u.name AS creator_name, p.is_public,
-       COALESCE(fc.cnt, 0) AS file_count,
-       COUNT(*) OVER() AS total
-FROM data.pools p
-JOIN core.users u ON u.id = p.creator_id
-LEFT JOIN %s fc ON fc.pool_id = p.id
-%s
-ORDER BY %s %s NULLS LAST, p.id ASC
-LIMIT $%d OFFSET $%d`, poolCountSubquery, where, sortCol, order, n, n+1)
-
-	args = append(args, limit, offset)
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, args...)
-	if err != nil {
-		return nil, fmt.Errorf("PoolRepo.List query: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[poolRowWithTotal])
-	if err != nil {
-		return nil, fmt.Errorf("PoolRepo.List scan: %w", err)
-	}
-
-	items := make([]domain.Pool, len(collected))
-	total := 0
-	for i, row := range collected {
-		items[i] = toPool(row.poolRow)
-		total = row.Total
-	}
-	return &domain.PoolOffsetPage{
-		Items:  items,
-		Total:  total,
-		Offset: offset,
-		Limit:  limit,
-	}, nil
-}
-
-// ---------------------------------------------------------------------------
-// GetByID
-// ---------------------------------------------------------------------------
-
-func (r *PoolRepo) GetByID(ctx context.Context, id uuid.UUID) (*domain.Pool, error) {
-	query := poolSelectFrom + `
-WHERE p.id = $1`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, id)
-	if err != nil {
-		return nil, fmt.Errorf("PoolRepo.GetByID: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[poolRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("PoolRepo.GetByID scan: %w", err)
-	}
-	p := toPool(row)
-	return &p, nil
-}
-
-// ---------------------------------------------------------------------------
-// Create
-// ---------------------------------------------------------------------------
-
-func (r *PoolRepo) Create(ctx context.Context, p *domain.Pool) (*domain.Pool, error) {
-	const query = `
-WITH ins AS (
-    INSERT INTO data.pools (name, notes, metadata, creator_id, is_public)
-    VALUES ($1, $2, $3, $4, $5)
-    RETURNING *
-)
-SELECT ins.id, ins.name, ins.notes, ins.metadata,
-       ins.creator_id, u.name AS creator_name, ins.is_public,
-       0 AS file_count
-FROM ins
-JOIN core.users u ON u.id = ins.creator_id`
-
-	var meta any
-	if len(p.Metadata) > 0 {
-		meta = p.Metadata
-	}
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, p.Name, p.Notes, meta, p.CreatorID, p.IsPublic)
-	if err != nil {
-		return nil, fmt.Errorf("PoolRepo.Create: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[poolRow])
-	if err != nil {
-		if isPgUniqueViolation(err) {
-			return nil, domain.ErrConflict
-		}
-		return nil, fmt.Errorf("PoolRepo.Create scan: %w", err)
-	}
-	created := toPool(row)
-	return &created, nil
-}
-
-// ---------------------------------------------------------------------------
-// Update
-// ---------------------------------------------------------------------------
-
-func (r *PoolRepo) Update(ctx context.Context, id uuid.UUID, p *domain.Pool) (*domain.Pool, error) {
-	const query = `
-WITH upd AS (
-    UPDATE data.pools SET
-        name      = $2,
-        notes     = $3,
-        metadata  = COALESCE($4, metadata),
-        is_public = $5
-    WHERE id = $1
-    RETURNING *
-)
-SELECT upd.id, upd.name, upd.notes, upd.metadata,
-       upd.creator_id, u.name AS creator_name, upd.is_public,
-       COALESCE(fc.cnt, 0) AS file_count
-FROM upd
-JOIN core.users u ON u.id = upd.creator_id
-LEFT JOIN (SELECT pool_id, COUNT(*) AS cnt FROM data.file_pool WHERE pool_id = $1 GROUP BY pool_id) fc
-    ON fc.pool_id = upd.id`
-
-	var meta any
-	if len(p.Metadata) > 0 {
-		meta = p.Metadata
-	}
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, id, p.Name, p.Notes, meta, p.IsPublic)
-	if err != nil {
-		return nil, fmt.Errorf("PoolRepo.Update: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[poolRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		if isPgUniqueViolation(err) {
-			return nil, domain.ErrConflict
-		}
-		return nil, fmt.Errorf("PoolRepo.Update scan: %w", err)
-	}
-	updated := toPool(row)
-	return &updated, nil
-}
-
-// ---------------------------------------------------------------------------
-// Delete
-// ---------------------------------------------------------------------------
-
-func (r *PoolRepo) Delete(ctx context.Context, id uuid.UUID) error {
-	const query = `DELETE FROM data.pools WHERE id = $1`
-	q := connOrTx(ctx, r.pool)
-	ct, err := q.Exec(ctx, query, id)
-	if err != nil {
-		return fmt.Errorf("PoolRepo.Delete: %w", err)
-	}
-	if ct.RowsAffected() == 0 {
-		return domain.ErrNotFound
-	}
-	return nil
-}
-
-// ---------------------------------------------------------------------------
-// ListFiles
-// ---------------------------------------------------------------------------
-
-// fileSelectForPool is the column list for pool file queries (without position).
-const fileSelectForPool = `
-    f.id, f.original_name,
-    mt.name AS mime_type, mt.extension AS mime_extension,
-    f.content_datetime, f.notes, f.metadata, f.exif, f.phash,
-    f.creator_id, u.name AS creator_name,
-    f.is_public, f.is_deleted`
-
-func (r *PoolRepo) ListFiles(ctx context.Context, poolID uuid.UUID, params port.PoolFileListParams) (*domain.PoolFilePage, error) {
-	limit := db.ClampLimit(params.Limit, 50, 200)
-
-	args := []any{poolID}
-	n := 2
-	var conds []string
-
-	conds = append(conds, "fp.pool_id = $1")
-	conds = append(conds, "f.is_deleted = false")
-
-	if params.Filter != "" {
-		filterSQL, nextN, filterArgs, err := ParseFilter(params.Filter, n)
-		if err != nil {
-			return nil, fmt.Errorf("%w: %v", domain.ErrValidation, err)
-		}
-		if filterSQL != "" {
-			conds = append(conds, filterSQL)
-			n = nextN
-			args = append(args, filterArgs...)
-		}
-	}
-
-	// Cursor condition.
-	var orderBy string
-	if params.Cursor != "" {
-		cur, err := decodePoolCursor(params.Cursor)
-		if err != nil {
-			return nil, fmt.Errorf("%w: %v", domain.ErrValidation, err)
-		}
-		fileID, err := uuid.Parse(cur.FileID)
-		if err != nil {
-			return nil, domain.ErrValidation
-		}
-		conds = append(conds, fmt.Sprintf(
-			"(fp.position > $%d OR (fp.position = $%d AND fp.file_id > $%d))",
-			n, n, n+1))
-		args = append(args, cur.Position, fileID)
-		n += 2
-	}
-	orderBy = "fp.position ASC, fp.file_id ASC"
-
-	where := "WHERE " + strings.Join(conds, " AND ")
-	args = append(args, limit+1)
-
-	sqlStr := fmt.Sprintf(`
-SELECT %s, fp.position
-FROM data.file_pool fp
-JOIN data.files f       ON f.id  = fp.file_id
-JOIN core.mime_types mt ON mt.id = f.mime_id
-JOIN core.users u       ON u.id  = f.creator_id
-%s
-ORDER BY %s
-LIMIT $%d`, fileSelectForPool, where, orderBy, n)
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sqlStr, args...)
-	if err != nil {
-		return nil, fmt.Errorf("PoolRepo.ListFiles query: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[poolFileRow])
-	if err != nil {
-		return nil, fmt.Errorf("PoolRepo.ListFiles scan: %w", err)
-	}
-
-	hasMore := len(collected) > limit
-	if hasMore {
-		collected = collected[:limit]
-	}
-
-	items := make([]domain.PoolFile, len(collected))
-	for i, row := range collected {
-		items[i] = toPoolFile(row)
-	}
-
-	page := &domain.PoolFilePage{Items: items}
-
-	if hasMore && len(collected) > 0 {
-		last := collected[len(collected)-1]
-		cur := encodePoolCursor(poolFileCursor{
-			Position: last.Position,
-			FileID:   last.ID.String(),
-		})
-		page.NextCursor = &cur
-	}
-
-	// Batch-load tags.
-	if len(items) > 0 {
-		fileIDs := make([]uuid.UUID, len(items))
-		for i, pf := range items {
-			fileIDs[i] = pf.File.ID
-		}
-		tagMap, err := r.loadPoolTagsBatch(ctx, fileIDs)
-		if err != nil {
-			return nil, err
-		}
-		for i, pf := range items {
-			page.Items[i].File.Tags = tagMap[pf.File.ID]
-		}
-	}
-
-	return page, nil
-}
-
-// loadPoolTagsBatch re-uses the same pattern as FileRepo.loadTagsBatch.
-func (r *PoolRepo) loadPoolTagsBatch(ctx context.Context, fileIDs []uuid.UUID) (map[uuid.UUID][]domain.Tag, error) {
-	if len(fileIDs) == 0 {
-		return nil, nil
-	}
-	placeholders := make([]string, len(fileIDs))
-	args := make([]any, len(fileIDs))
-	for i, id := range fileIDs {
-		placeholders[i] = fmt.Sprintf("$%d", i+1)
-		args[i] = id
-	}
-	sqlStr := fmt.Sprintf(`
-SELECT ft.file_id,
-       t.id, t.name, t.notes, t.color,
-       t.category_id,
-       c.name  AS category_name,
-       c.color AS category_color,
-       t.metadata, t.creator_id, u.name AS creator_name, t.is_public
-FROM data.file_tag ft
-JOIN  data.tags t           ON t.id = ft.tag_id
-JOIN  core.users u          ON u.id = t.creator_id
-LEFT JOIN data.categories c ON c.id = t.category_id
-WHERE ft.file_id IN (%s)
-ORDER BY ft.file_id, t.name`, strings.Join(placeholders, ","))
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sqlStr, args...)
-	if err != nil {
-		return nil, fmt.Errorf("PoolRepo.loadPoolTagsBatch: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[fileTagRow])
-	if err != nil {
-		return nil, fmt.Errorf("PoolRepo.loadPoolTagsBatch scan: %w", err)
-	}
-	result := make(map[uuid.UUID][]domain.Tag, len(fileIDs))
-	for _, fid := range fileIDs {
-		result[fid] = []domain.Tag{}
-	}
-	for _, row := range collected {
-		result[row.FileID] = append(result[row.FileID], toTagFromFileTag(row))
-	}
-	return result, nil
-}
-
-// ---------------------------------------------------------------------------
-// AddFiles
-// ---------------------------------------------------------------------------
-
-// AddFiles inserts files into the pool. When position is nil, files are
-// appended after the last existing file (MAX(position) + 1000 * i).
-// When position is provided (0-indexed), files are inserted at that index
-// and all pool positions are reassigned in one shot.
-func (r *PoolRepo) AddFiles(ctx context.Context, poolID uuid.UUID, fileIDs []uuid.UUID, position *int) error {
-	if len(fileIDs) == 0 {
-		return nil
-	}
-	q := connOrTx(ctx, r.pool)
-
-	if position == nil {
-		// Append: get current max position, then bulk-insert.
-		var maxPos int
-		row := q.QueryRow(ctx, `SELECT COALESCE(MAX(position), 0) FROM data.file_pool WHERE pool_id = $1`, poolID)
-		if err := row.Scan(&maxPos); err != nil {
-			return fmt.Errorf("PoolRepo.AddFiles maxPos: %w", err)
-		}
-		const ins = `INSERT INTO data.file_pool (file_id, pool_id, position) VALUES ($1, $2, $3) ON CONFLICT DO NOTHING`
-		for i, fid := range fileIDs {
-			if _, err := q.Exec(ctx, ins, fid, poolID, maxPos+1000*(i+1)); err != nil {
-				return fmt.Errorf("PoolRepo.AddFiles insert: %w", err)
-			}
-		}
-		return nil
-	}
-
-	// Positional insert: rebuild the full ordered list and reassign.
-	return r.insertAtPosition(ctx, q, poolID, fileIDs, *position)
-}
-
-// insertAtPosition fetches the current ordered file list, splices in the new
-// IDs at index pos (0-indexed, clamped), then does a full position reassign.
-func (r *PoolRepo) insertAtPosition(ctx context.Context, q db.Querier, poolID uuid.UUID, newIDs []uuid.UUID, pos int) error {
-	// 1. Fetch current order.
-	rows, err := q.Query(ctx, `SELECT file_id FROM data.file_pool WHERE pool_id = $1 ORDER BY position ASC, file_id ASC`, poolID)
-	if err != nil {
-		return fmt.Errorf("PoolRepo.insertAtPosition fetch: %w", err)
-	}
-	var current []uuid.UUID
-	for rows.Next() {
-		var fid uuid.UUID
-		if err := rows.Scan(&fid); err != nil {
-			rows.Close()
-			return fmt.Errorf("PoolRepo.insertAtPosition scan: %w", err)
-		}
-		current = append(current, fid)
-	}
-	rows.Close()
-	if err := rows.Err(); err != nil {
-		return fmt.Errorf("PoolRepo.insertAtPosition rows: %w", err)
-	}
-
-	// 2. Build new ordered list, skipping already-present IDs from newIDs.
-	present := make(map[uuid.UUID]bool, len(current))
-	for _, fid := range current {
-		present[fid] = true
-	}
-	toAdd := make([]uuid.UUID, 0, len(newIDs))
-	for _, fid := range newIDs {
-		if !present[fid] {
-			toAdd = append(toAdd, fid)
-		}
-	}
-	if len(toAdd) == 0 {
-		return nil // all already present
-	}
-
-	if pos < 0 {
-		pos = 0
-	}
-	if pos > len(current) {
-		pos = len(current)
-	}
-
-	ordered := make([]uuid.UUID, 0, len(current)+len(toAdd))
-	ordered = append(ordered, current[:pos]...)
-	ordered = append(ordered, toAdd...)
-	ordered = append(ordered, current[pos:]...)
-
-	// 3. Full replace.
-	return r.reassignPositions(ctx, q, poolID, ordered)
-}
-
-// reassignPositions does a DELETE + bulk INSERT for the pool with positions
-// 1000, 2000, 3000, ...
-func (r *PoolRepo) reassignPositions(ctx context.Context, q db.Querier, poolID uuid.UUID, ordered []uuid.UUID) error {
-	if _, err := q.Exec(ctx, `DELETE FROM data.file_pool WHERE pool_id = $1`, poolID); err != nil {
-		return fmt.Errorf("PoolRepo.reassignPositions delete: %w", err)
-	}
-	if len(ordered) == 0 {
-		return nil
-	}
-	const ins = `INSERT INTO data.file_pool (file_id, pool_id, position) VALUES ($1, $2, $3)`
-	for i, fid := range ordered {
-		if _, err := q.Exec(ctx, ins, fid, poolID, 1000*(i+1)); err != nil {
-			return fmt.Errorf("PoolRepo.reassignPositions insert: %w", err)
-		}
-	}
-	return nil
-}
-
-// ---------------------------------------------------------------------------
-// RemoveFiles
-// ---------------------------------------------------------------------------
-
-func (r *PoolRepo) RemoveFiles(ctx context.Context, poolID uuid.UUID, fileIDs []uuid.UUID) error {
-	if len(fileIDs) == 0 {
-		return nil
-	}
-	placeholders := make([]string, len(fileIDs))
-	args := make([]any, len(fileIDs)+1)
-	args[0] = poolID
-	for i, fid := range fileIDs {
-		placeholders[i] = fmt.Sprintf("$%d", i+2)
-		args[i+1] = fid
-	}
-	query := fmt.Sprintf(
-		`DELETE FROM data.file_pool WHERE pool_id = $1 AND file_id IN (%s)`,
-		strings.Join(placeholders, ","))
-
-	q := connOrTx(ctx, r.pool)
-	if _, err := q.Exec(ctx, query, args...); err != nil {
-		return fmt.Errorf("PoolRepo.RemoveFiles: %w", err)
-	}
-	return nil
-}
-
-// ---------------------------------------------------------------------------
-// Reorder
-// ---------------------------------------------------------------------------
-
-// Reorder replaces the full ordered sequence with positions 1000, 2000, …
-// Only file IDs already in the pool are allowed; unknown IDs are silently
-// skipped to avoid integrity violations.
-func (r *PoolRepo) Reorder(ctx context.Context, poolID uuid.UUID, fileIDs []uuid.UUID) error {
-	q := connOrTx(ctx, r.pool)
-	return r.reassignPositions(ctx, q, poolID, fileIDs)
-}
--- a/backend/internal/db/postgres/postgres.go
+++ b/backend/internal/db/postgres/postgres.go
@ -1,67 +0,0 @@
-// Package postgres provides the PostgreSQL implementations of the port interfaces.
-package postgres
-
-import (
-	"context"
-	"fmt"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-
-	"tanabata/backend/internal/db"
-)
-
-// NewPool creates and validates a *pgxpool.Pool from the given connection URL.
-// The pool is ready to use; the caller is responsible for closing it.
-func NewPool(ctx context.Context, url string) (*pgxpool.Pool, error) {
-	pool, err := pgxpool.New(ctx, url)
-	if err != nil {
-		return nil, fmt.Errorf("pgxpool.New: %w", err)
-	}
-	if err := pool.Ping(ctx); err != nil {
-		pool.Close()
-		return nil, fmt.Errorf("postgres ping: %w", err)
-	}
-	return pool, nil
-}
-
-// Transactor implements port.Transactor using a pgxpool.Pool.
-type Transactor struct {
-	pool *pgxpool.Pool
-}
-
-// NewTransactor creates a Transactor backed by pool.
-func NewTransactor(pool *pgxpool.Pool) *Transactor {
-	return &Transactor{pool: pool}
-}
-
-// WithTx begins a transaction, stores it in ctx, and calls fn. If fn returns
-// an error the transaction is rolled back; otherwise it is committed.
-func (t *Transactor) WithTx(ctx context.Context, fn func(ctx context.Context) error) error {
-	tx, err := t.pool.BeginTx(ctx, pgx.TxOptions{})
-	if err != nil {
-		return fmt.Errorf("begin tx: %w", err)
-	}
-
-	txCtx := db.ContextWithTx(ctx, tx)
-
-	if err := fn(txCtx); err != nil {
-		_ = tx.Rollback(ctx)
-		return err
-	}
-
-	if err := tx.Commit(ctx); err != nil {
-		return fmt.Errorf("commit tx: %w", err)
-	}
-	return nil
-}
-
-// connOrTx returns the pgx.Tx stored in ctx by WithTx, or the pool itself when
-// no transaction is active. The returned value satisfies db.Querier and can be
-// used directly for queries and commands.
-func connOrTx(ctx context.Context, pool *pgxpool.Pool) db.Querier {
-	if tx, ok := db.TxFromContext(ctx); ok {
-		return tx
-	}
-	return pool
-}
--- a/backend/internal/db/postgres/session_repo.go
+++ b/backend/internal/db/postgres/session_repo.go
@ -1,162 +0,0 @@
-package postgres
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"time"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// sessionRow matches the columns stored in activity.sessions.
-// IsCurrent is a service-layer concern and is not stored in the database.
-type sessionRow struct {
-	ID           int        `db:"id"`
-	TokenHash    string     `db:"token_hash"`
-	UserID       int16      `db:"user_id"`
-	UserAgent    string     `db:"user_agent"`
-	StartedAt    time.Time  `db:"started_at"`
-	ExpiresAt    *time.Time `db:"expires_at"`
-	LastActivity time.Time  `db:"last_activity"`
-}
-
-// sessionRowWithTotal extends sessionRow with a window-function count for ListByUser.
-type sessionRowWithTotal struct {
-	sessionRow
-	Total int `db:"total"`
-}
-
-func toSession(r sessionRow) domain.Session {
-	return domain.Session{
-		ID:           r.ID,
-		TokenHash:    r.TokenHash,
-		UserID:       r.UserID,
-		UserAgent:    r.UserAgent,
-		StartedAt:    r.StartedAt,
-		ExpiresAt:    r.ExpiresAt,
-		LastActivity: r.LastActivity,
-	}
-}
-
-// SessionRepo implements port.SessionRepo using PostgreSQL.
-type SessionRepo struct {
-	pool *pgxpool.Pool
-}
-
-// NewSessionRepo creates a SessionRepo backed by pool.
-func NewSessionRepo(pool *pgxpool.Pool) *SessionRepo {
-	return &SessionRepo{pool: pool}
-}
-
-var _ port.SessionRepo = (*SessionRepo)(nil)
-
-func (r *SessionRepo) Create(ctx context.Context, s *domain.Session) (*domain.Session, error) {
-	const sql = `
-		INSERT INTO activity.sessions (token_hash, user_id, user_agent, expires_at)
-		VALUES ($1, $2, $3, $4)
-		RETURNING id, token_hash, user_id, user_agent, started_at, expires_at, last_activity`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, s.TokenHash, s.UserID, s.UserAgent, s.ExpiresAt)
-	if err != nil {
-		return nil, fmt.Errorf("SessionRepo.Create: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[sessionRow])
-	if err != nil {
-		return nil, fmt.Errorf("SessionRepo.Create scan: %w", err)
-	}
-	created := toSession(row)
-	return &created, nil
-}
-
-func (r *SessionRepo) GetByTokenHash(ctx context.Context, hash string) (*domain.Session, error) {
-	const sql = `
-		SELECT id, token_hash, user_id, user_agent, started_at, expires_at, last_activity
-		FROM activity.sessions
-		WHERE token_hash = $1 AND is_active = true`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, hash)
-	if err != nil {
-		return nil, fmt.Errorf("SessionRepo.GetByTokenHash: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[sessionRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("SessionRepo.GetByTokenHash scan: %w", err)
-	}
-	s := toSession(row)
-	return &s, nil
-}
-
-func (r *SessionRepo) ListByUser(ctx context.Context, userID int16) (*domain.SessionList, error) {
-	const sql = `
-		SELECT id, token_hash, user_id, user_agent, started_at, expires_at, last_activity,
-		       COUNT(*) OVER() AS total
-		FROM activity.sessions
-		WHERE user_id = $1 AND is_active = true
-		ORDER BY started_at DESC`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, userID)
-	if err != nil {
-		return nil, fmt.Errorf("SessionRepo.ListByUser: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[sessionRowWithTotal])
-	if err != nil {
-		return nil, fmt.Errorf("SessionRepo.ListByUser scan: %w", err)
-	}
-
-	list := &domain.SessionList{}
-	if len(collected) > 0 {
-		list.Total = collected[0].Total
-	}
-	list.Items = make([]domain.Session, len(collected))
-	for i, row := range collected {
-		list.Items[i] = toSession(row.sessionRow)
-	}
-	return list, nil
-}
-
-func (r *SessionRepo) UpdateLastActivity(ctx context.Context, id int, t time.Time) error {
-	const sql = `UPDATE activity.sessions SET last_activity = $2 WHERE id = $1`
-	q := connOrTx(ctx, r.pool)
-	tag, err := q.Exec(ctx, sql, id, t)
-	if err != nil {
-		return fmt.Errorf("SessionRepo.UpdateLastActivity: %w", err)
-	}
-	if tag.RowsAffected() == 0 {
-		return domain.ErrNotFound
-	}
-	return nil
-}
-
-func (r *SessionRepo) Delete(ctx context.Context, id int) error {
-	const sql = `UPDATE activity.sessions SET is_active = false WHERE id = $1 AND is_active = true`
-	q := connOrTx(ctx, r.pool)
-	tag, err := q.Exec(ctx, sql, id)
-	if err != nil {
-		return fmt.Errorf("SessionRepo.Delete: %w", err)
-	}
-	if tag.RowsAffected() == 0 {
-		return domain.ErrNotFound
-	}
-	return nil
-}
-
-func (r *SessionRepo) DeleteByUserID(ctx context.Context, userID int16) error {
-	const sql = `UPDATE activity.sessions SET is_active = false WHERE user_id = $1 AND is_active = true`
-	q := connOrTx(ctx, r.pool)
-	_, err := q.Exec(ctx, sql, userID)
-	if err != nil {
-		return fmt.Errorf("SessionRepo.DeleteByUserID: %w", err)
-	}
-	return nil
-}
--- a/backend/internal/db/postgres/tag_repo.go
+++ b/backend/internal/db/postgres/tag_repo.go
@ -1,634 +0,0 @@
-package postgres
-
-import (
-	"context"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"strings"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgconn"
-	"github.com/jackc/pgx/v5/pgxpool"
-
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// ---------------------------------------------------------------------------
-// Row structs — use pgx-scannable types
-// ---------------------------------------------------------------------------
-
-type tagRow struct {
-	ID            uuid.UUID  `db:"id"`
-	Name          string      `db:"name"`
-	Notes         *string     `db:"notes"`
-	Color         *string     `db:"color"`
-	CategoryID    *uuid.UUID `db:"category_id"`
-	CategoryName  *string     `db:"category_name"`
-	CategoryColor *string     `db:"category_color"`
-	Metadata      []byte      `db:"metadata"`
-	CreatorID     int16       `db:"creator_id"`
-	CreatorName   string      `db:"creator_name"`
-	IsPublic      bool        `db:"is_public"`
-}
-
-type tagRowWithTotal struct {
-	tagRow
-	Total int `db:"total"`
-}
-
-type tagRuleRow struct {
-	WhenTagID   uuid.UUID `db:"when_tag_id"`
-	ThenTagID   uuid.UUID `db:"then_tag_id"`
-	ThenTagName string     `db:"then_tag_name"`
-	IsActive    bool       `db:"is_active"`
-}
-
-// ---------------------------------------------------------------------------
-// Converters
-// ---------------------------------------------------------------------------
-
-func toTag(r tagRow) domain.Tag {
-	t := domain.Tag{
-		ID:            r.ID,
-		Name:          r.Name,
-		Notes:         r.Notes,
-		Color:         r.Color,
-		CategoryID:    r.CategoryID,
-		CategoryName:  r.CategoryName,
-		CategoryColor: r.CategoryColor,
-		CreatorID:     r.CreatorID,
-		CreatorName:   r.CreatorName,
-		IsPublic:      r.IsPublic,
-		CreatedAt:     domain.UUIDCreatedAt(r.ID),
-	}
-	if len(r.Metadata) > 0 && string(r.Metadata) != "null" {
-		t.Metadata = json.RawMessage(r.Metadata)
-	}
-	return t
-}
-
-func toTagRule(r tagRuleRow) domain.TagRule {
-	return domain.TagRule{
-		WhenTagID:   r.WhenTagID,
-		ThenTagID:   r.ThenTagID,
-		ThenTagName: r.ThenTagName,
-		IsActive:    r.IsActive,
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Shared SQL fragments
-// ---------------------------------------------------------------------------
-
-const tagSelectFrom = `
-SELECT
-    t.id,
-    t.name,
-    t.notes,
-    t.color,
-    t.category_id,
-    c.name  AS category_name,
-    c.color AS category_color,
-    t.metadata,
-    t.creator_id,
-    u.name  AS creator_name,
-    t.is_public
-FROM data.tags t
-LEFT JOIN data.categories c ON c.id = t.category_id
-JOIN      core.users u ON u.id = t.creator_id`
-
-func tagSortColumn(s string) string {
-	switch s {
-	case "name":
-		return "t.name"
-	case "color":
-		return "t.color"
-	case "category_name":
-		return "c.name"
-	default: // "created"
-		return "t.id"
-	}
-}
-
-// isPgUniqueViolation reports whether err is a PostgreSQL unique-constraint error.
-func isPgUniqueViolation(err error) bool {
-	var pgErr *pgconn.PgError
-	return errors.As(err, &pgErr) && pgErr.Code == "23505"
-}
-
-// ---------------------------------------------------------------------------
-// TagRepo — implements port.TagRepo
-// ---------------------------------------------------------------------------
-
-// TagRepo handles tag CRUD and file–tag relations.
-type TagRepo struct {
-	pool *pgxpool.Pool
-}
-
-var _ port.TagRepo = (*TagRepo)(nil)
-
-// NewTagRepo creates a TagRepo backed by pool.
-func NewTagRepo(pool *pgxpool.Pool) *TagRepo {
-	return &TagRepo{pool: pool}
-}
-
-// ---------------------------------------------------------------------------
-// List / ListByCategory
-// ---------------------------------------------------------------------------
-
-func (r *TagRepo) List(ctx context.Context, params port.OffsetParams) (*domain.TagOffsetPage, error) {
-	return r.listTags(ctx, params, nil)
-}
-
-func (r *TagRepo) ListByCategory(ctx context.Context, categoryID uuid.UUID, params port.OffsetParams) (*domain.TagOffsetPage, error) {
-	return r.listTags(ctx, params, &categoryID)
-}
-
-func (r *TagRepo) listTags(ctx context.Context, params port.OffsetParams, categoryID *uuid.UUID) (*domain.TagOffsetPage, error) {
-	order := "ASC"
-	if strings.ToLower(params.Order) == "desc" {
-		order = "DESC"
-	}
-	sortCol := tagSortColumn(params.Sort)
-
-	args := []any{}
-	n := 1
-	var conditions []string
-
-	if params.Search != "" {
-		conditions = append(conditions, fmt.Sprintf("lower(t.name) LIKE lower($%d)", n))
-		args = append(args, "%"+params.Search+"%")
-		n++
-	}
-	if categoryID != nil {
-		conditions = append(conditions, fmt.Sprintf("t.category_id = $%d", n))
-		args = append(args, *categoryID)
-		n++
-	}
-
-	where := ""
-	if len(conditions) > 0 {
-		where = "WHERE " + strings.Join(conditions, " AND ")
-	}
-
-	limit := params.Limit
-	if limit <= 0 {
-		limit = 50
-	}
-	offset := params.Offset
-	if offset < 0 {
-		offset = 0
-	}
-
-	query := fmt.Sprintf(`
-SELECT
-    t.id, t.name, t.notes, t.color,
-    t.category_id,
-    c.name  AS category_name,
-    c.color AS category_color,
-    t.metadata, t.creator_id,
-    u.name  AS creator_name,
-    t.is_public,
-    COUNT(*) OVER() AS total
-FROM data.tags t
-LEFT JOIN data.categories c ON c.id = t.category_id
-JOIN      core.users u ON u.id = t.creator_id
-%s
-ORDER BY %s %s NULLS LAST, t.id ASC
-LIMIT $%d OFFSET $%d`, where, sortCol, order, n, n+1)
-
-	args = append(args, limit, offset)
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, args...)
-	if err != nil {
-		return nil, fmt.Errorf("TagRepo.List query: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[tagRowWithTotal])
-	if err != nil {
-		return nil, fmt.Errorf("TagRepo.List scan: %w", err)
-	}
-
-	items := make([]domain.Tag, len(collected))
-	total := 0
-	for i, row := range collected {
-		items[i] = toTag(row.tagRow)
-		total = row.Total
-	}
-	return &domain.TagOffsetPage{
-		Items:  items,
-		Total:  total,
-		Offset: offset,
-		Limit:  limit,
-	}, nil
-}
-
-// ---------------------------------------------------------------------------
-// GetByID
-// ---------------------------------------------------------------------------
-
-func (r *TagRepo) GetByID(ctx context.Context, id uuid.UUID) (*domain.Tag, error) {
-	const query = tagSelectFrom + `
-WHERE t.id = $1`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, id)
-	if err != nil {
-		return nil, fmt.Errorf("TagRepo.GetByID: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[tagRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("TagRepo.GetByID scan: %w", err)
-	}
-	t := toTag(row)
-	return &t, nil
-}
-
-// ---------------------------------------------------------------------------
-// Create
-// ---------------------------------------------------------------------------
-
-func (r *TagRepo) Create(ctx context.Context, t *domain.Tag) (*domain.Tag, error) {
-	const query = `
-WITH ins AS (
-    INSERT INTO data.tags (name, notes, color, category_id, metadata, creator_id, is_public)
-    VALUES ($1, $2, $3, $4, $5, $6, $7)
-    RETURNING *
-)
-SELECT
-    ins.id, ins.name, ins.notes, ins.color,
-    ins.category_id,
-    c.name  AS category_name,
-    c.color AS category_color,
-    ins.metadata, ins.creator_id,
-    u.name  AS creator_name,
-    ins.is_public
-FROM ins
-LEFT JOIN data.categories c ON c.id = ins.category_id
-JOIN      core.users u ON u.id = ins.creator_id`
-
-	var meta any
-	if len(t.Metadata) > 0 {
-		meta = t.Metadata
-	}
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query,
-		t.Name, t.Notes, t.Color, t.CategoryID, meta, t.CreatorID, t.IsPublic)
-	if err != nil {
-		return nil, fmt.Errorf("TagRepo.Create: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[tagRow])
-	if err != nil {
-		if isPgUniqueViolation(err) {
-			return nil, domain.ErrConflict
-		}
-		return nil, fmt.Errorf("TagRepo.Create scan: %w", err)
-	}
-	created := toTag(row)
-	return &created, nil
-}
-
-// ---------------------------------------------------------------------------
-// Update
-// ---------------------------------------------------------------------------
-
-// Update replaces all mutable fields. The caller must merge current values with
-// the patch (read-then-write) before calling this.
-func (r *TagRepo) Update(ctx context.Context, id uuid.UUID, t *domain.Tag) (*domain.Tag, error) {
-	const query = `
-WITH upd AS (
-    UPDATE data.tags SET
-        name        = $2,
-        notes       = $3,
-        color       = $4,
-        category_id = $5,
-        metadata    = COALESCE($6, metadata),
-        is_public   = $7
-    WHERE id = $1
-    RETURNING *
-)
-SELECT
-    upd.id, upd.name, upd.notes, upd.color,
-    upd.category_id,
-    c.name  AS category_name,
-    c.color AS category_color,
-    upd.metadata, upd.creator_id,
-    u.name  AS creator_name,
-    upd.is_public
-FROM upd
-LEFT JOIN data.categories c ON c.id = upd.category_id
-JOIN      core.users u ON u.id = upd.creator_id`
-
-	var meta any
-	if len(t.Metadata) > 0 {
-		meta = t.Metadata
-	}
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query,
-		id, t.Name, t.Notes, t.Color, t.CategoryID, meta, t.IsPublic)
-	if err != nil {
-		return nil, fmt.Errorf("TagRepo.Update: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[tagRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		if isPgUniqueViolation(err) {
-			return nil, domain.ErrConflict
-		}
-		return nil, fmt.Errorf("TagRepo.Update scan: %w", err)
-	}
-	updated := toTag(row)
-	return &updated, nil
-}
-
-// ---------------------------------------------------------------------------
-// Delete
-// ---------------------------------------------------------------------------
-
-func (r *TagRepo) Delete(ctx context.Context, id uuid.UUID) error {
-	const query = `DELETE FROM data.tags WHERE id = $1`
-
-	q := connOrTx(ctx, r.pool)
-	ct, err := q.Exec(ctx, query, id)
-	if err != nil {
-		return fmt.Errorf("TagRepo.Delete: %w", err)
-	}
-	if ct.RowsAffected() == 0 {
-		return domain.ErrNotFound
-	}
-	return nil
-}
-
-// ---------------------------------------------------------------------------
-// File–tag operations
-// ---------------------------------------------------------------------------
-
-func (r *TagRepo) ListByFile(ctx context.Context, fileID uuid.UUID) ([]domain.Tag, error) {
-	const query = tagSelectFrom + `
-JOIN data.file_tag ft ON ft.tag_id = t.id
-WHERE ft.file_id = $1
-ORDER BY t.name`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, fileID)
-	if err != nil {
-		return nil, fmt.Errorf("TagRepo.ListByFile: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[tagRow])
-	if err != nil {
-		return nil, fmt.Errorf("TagRepo.ListByFile scan: %w", err)
-	}
-	tags := make([]domain.Tag, len(collected))
-	for i, row := range collected {
-		tags[i] = toTag(row)
-	}
-	return tags, nil
-}
-
-func (r *TagRepo) AddFileTag(ctx context.Context, fileID, tagID uuid.UUID) error {
-	const query = `
-INSERT INTO data.file_tag (file_id, tag_id) VALUES ($1, $2)
-ON CONFLICT DO NOTHING`
-
-	q := connOrTx(ctx, r.pool)
-	if _, err := q.Exec(ctx, query, fileID, tagID); err != nil {
-		return fmt.Errorf("TagRepo.AddFileTag: %w", err)
-	}
-	return nil
-}
-
-func (r *TagRepo) RemoveFileTag(ctx context.Context, fileID, tagID uuid.UUID) error {
-	const query = `DELETE FROM data.file_tag WHERE file_id = $1 AND tag_id = $2`
-
-	q := connOrTx(ctx, r.pool)
-	if _, err := q.Exec(ctx, query, fileID, tagID); err != nil {
-		return fmt.Errorf("TagRepo.RemoveFileTag: %w", err)
-	}
-	return nil
-}
-
-func (r *TagRepo) SetFileTags(ctx context.Context, fileID uuid.UUID, tagIDs []uuid.UUID) error {
-	q := connOrTx(ctx, r.pool)
-
-	if _, err := q.Exec(ctx,
-		`DELETE FROM data.file_tag WHERE file_id = $1`, fileID); err != nil {
-		return fmt.Errorf("TagRepo.SetFileTags delete: %w", err)
-	}
-	if len(tagIDs) == 0 {
-		return nil
-	}
-
-	placeholders := make([]string, len(tagIDs))
-	args := []any{fileID}
-	for i, tagID := range tagIDs {
-		placeholders[i] = fmt.Sprintf("($1, $%d)", i+2)
-		args = append(args, tagID)
-	}
-	ins := `INSERT INTO data.file_tag (file_id, tag_id) VALUES ` +
-		strings.Join(placeholders, ", ") + ` ON CONFLICT DO NOTHING`
-
-	if _, err := q.Exec(ctx, ins, args...); err != nil {
-		return fmt.Errorf("TagRepo.SetFileTags insert: %w", err)
-	}
-	return nil
-}
-
-func (r *TagRepo) CommonTagsForFiles(ctx context.Context, fileIDs []uuid.UUID) ([]domain.Tag, error) {
-	if len(fileIDs) == 0 {
-		return []domain.Tag{}, nil
-	}
-	return r.queryTagsByPresence(ctx, fileIDs, "=")
-}
-
-func (r *TagRepo) PartialTagsForFiles(ctx context.Context, fileIDs []uuid.UUID) ([]domain.Tag, error) {
-	if len(fileIDs) == 0 {
-		return []domain.Tag{}, nil
-	}
-	return r.queryTagsByPresence(ctx, fileIDs, "<")
-}
-
-func (r *TagRepo) queryTagsByPresence(ctx context.Context, fileIDs []uuid.UUID, op string) ([]domain.Tag, error) {
-	placeholders := make([]string, len(fileIDs))
-	args := make([]any, len(fileIDs)+1)
-	for i, id := range fileIDs {
-		placeholders[i] = fmt.Sprintf("$%d", i+1)
-		args[i] = id
-	}
-	args[len(fileIDs)] = len(fileIDs)
-	n := len(fileIDs) + 1
-
-	query := fmt.Sprintf(`
-SELECT
-    t.id, t.name, t.notes, t.color,
-    t.category_id,
-    c.name  AS category_name,
-    c.color AS category_color,
-    t.metadata, t.creator_id,
-    u.name  AS creator_name,
-    t.is_public
-FROM data.tags t
-JOIN data.file_tag ft ON ft.tag_id = t.id
-LEFT JOIN data.categories c ON c.id = t.category_id
-JOIN      core.users u ON u.id = t.creator_id
-WHERE ft.file_id IN (%s)
-GROUP BY t.id, c.id, u.id
-HAVING COUNT(DISTINCT ft.file_id) %s $%d
-ORDER BY t.name`,
-		strings.Join(placeholders, ", "), op, n)
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, args...)
-	if err != nil {
-		return nil, fmt.Errorf("TagRepo.queryTagsByPresence: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[tagRow])
-	if err != nil {
-		return nil, fmt.Errorf("TagRepo.queryTagsByPresence scan: %w", err)
-	}
-	tags := make([]domain.Tag, len(collected))
-	for i, row := range collected {
-		tags[i] = toTag(row)
-	}
-	return tags, nil
-}
-
-// ---------------------------------------------------------------------------
-// TagRuleRepo — implements port.TagRuleRepo (separate type to avoid method collision)
-// ---------------------------------------------------------------------------
-
-// TagRuleRepo handles tag-rule CRUD.
-type TagRuleRepo struct {
-	pool *pgxpool.Pool
-}
-
-var _ port.TagRuleRepo = (*TagRuleRepo)(nil)
-
-// NewTagRuleRepo creates a TagRuleRepo backed by pool.
-func NewTagRuleRepo(pool *pgxpool.Pool) *TagRuleRepo {
-	return &TagRuleRepo{pool: pool}
-}
-
-func (r *TagRuleRepo) ListByTag(ctx context.Context, tagID uuid.UUID) ([]domain.TagRule, error) {
-	const query = `
-SELECT
-    tr.when_tag_id,
-    tr.then_tag_id,
-    t.name AS then_tag_name,
-    tr.is_active
-FROM data.tag_rules tr
-JOIN data.tags t ON t.id = tr.then_tag_id
-WHERE tr.when_tag_id = $1
-ORDER BY t.name`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, tagID)
-	if err != nil {
-		return nil, fmt.Errorf("TagRuleRepo.ListByTag: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[tagRuleRow])
-	if err != nil {
-		return nil, fmt.Errorf("TagRuleRepo.ListByTag scan: %w", err)
-	}
-	rules := make([]domain.TagRule, len(collected))
-	for i, row := range collected {
-		rules[i] = toTagRule(row)
-	}
-	return rules, nil
-}
-
-func (r *TagRuleRepo) Create(ctx context.Context, rule domain.TagRule) (*domain.TagRule, error) {
-	const query = `
-WITH ins AS (
-    INSERT INTO data.tag_rules (when_tag_id, then_tag_id, is_active)
-    VALUES ($1, $2, $3)
-    RETURNING *
-)
-SELECT ins.when_tag_id, ins.then_tag_id, t.name AS then_tag_name, ins.is_active
-FROM ins
-JOIN data.tags t ON t.id = ins.then_tag_id`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, rule.WhenTagID, rule.ThenTagID, rule.IsActive)
-	if err != nil {
-		return nil, fmt.Errorf("TagRuleRepo.Create: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[tagRuleRow])
-	if err != nil {
-		if isPgUniqueViolation(err) {
-			return nil, domain.ErrConflict
-		}
-		return nil, fmt.Errorf("TagRuleRepo.Create scan: %w", err)
-	}
-	result := toTagRule(row)
-	return &result, nil
-}
-
-func (r *TagRuleRepo) SetActive(ctx context.Context, whenTagID, thenTagID uuid.UUID, active, applyToExisting bool) error {
-	const updateQuery = `
-UPDATE data.tag_rules SET is_active = $3
-WHERE when_tag_id = $1 AND then_tag_id = $2`
-
-	q := connOrTx(ctx, r.pool)
-	ct, err := q.Exec(ctx, updateQuery, whenTagID, thenTagID, active)
-	if err != nil {
-		return fmt.Errorf("TagRuleRepo.SetActive: %w", err)
-	}
-	if ct.RowsAffected() == 0 {
-		return domain.ErrNotFound
-	}
-
-	if !active || !applyToExisting {
-		return nil
-	}
-
-	// Retroactively apply the full transitive expansion of thenTagID to all
-	// files that already carry whenTagID. The recursive CTE walks active rules
-	// starting from thenTagID (mirrors the Go expandTagSet BFS).
-	const retroQuery = `
-WITH RECURSIVE expansion(tag_id) AS (
-    SELECT $2::uuid
-    UNION
-    SELECT r.then_tag_id
-    FROM data.tag_rules r
-    JOIN expansion e ON r.when_tag_id = e.tag_id
-    WHERE r.is_active = true
-)
-INSERT INTO data.file_tag (file_id, tag_id)
-SELECT ft.file_id, e.tag_id
-FROM data.file_tag ft
-CROSS JOIN expansion e
-WHERE ft.tag_id = $1
-ON CONFLICT DO NOTHING`
-
-	if _, err := q.Exec(ctx, retroQuery, whenTagID, thenTagID); err != nil {
-		return fmt.Errorf("TagRuleRepo.SetActive retroactive apply: %w", err)
-	}
-	return nil
-}
-
-func (r *TagRuleRepo) Delete(ctx context.Context, whenTagID, thenTagID uuid.UUID) error {
-	const query = `
-DELETE FROM data.tag_rules
-WHERE when_tag_id = $1 AND then_tag_id = $2`
-
-	q := connOrTx(ctx, r.pool)
-	ct, err := q.Exec(ctx, query, whenTagID, thenTagID)
-	if err != nil {
-		return fmt.Errorf("TagRuleRepo.Delete: %w", err)
-	}
-	if ct.RowsAffected() == 0 {
-		return domain.ErrNotFound
-	}
-	return nil
-}
--- a/backend/internal/db/postgres/user_repo.go
+++ b/backend/internal/db/postgres/user_repo.go
@ -1,196 +0,0 @@
-package postgres
-
-import (
-	"context"
-	"errors"
-	"fmt"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-
-	"tanabata/backend/internal/db"
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// userRow matches the columns returned by every user SELECT.
-type userRow struct {
-	ID        int16  `db:"id"`
-	Name      string `db:"name"`
-	Password  string `db:"password"`
-	IsAdmin   bool   `db:"is_admin"`
-	CanCreate bool   `db:"can_create"`
-	IsBlocked bool   `db:"is_blocked"`
-}
-
-// userRowWithTotal extends userRow with a window-function total for List.
-type userRowWithTotal struct {
-	userRow
-	Total int `db:"total"`
-}
-
-func toUser(r userRow) domain.User {
-	return domain.User{
-		ID:        r.ID,
-		Name:      r.Name,
-		Password:  r.Password,
-		IsAdmin:   r.IsAdmin,
-		CanCreate: r.CanCreate,
-		IsBlocked: r.IsBlocked,
-	}
-}
-
-// userSortColumn whitelists valid sort keys to prevent SQL injection.
-var userSortColumn = map[string]string{
-	"name": "name",
-	"id":   "id",
-}
-
-// UserRepo implements port.UserRepo using PostgreSQL.
-type UserRepo struct {
-	pool *pgxpool.Pool
-}
-
-// NewUserRepo creates a UserRepo backed by pool.
-func NewUserRepo(pool *pgxpool.Pool) *UserRepo {
-	return &UserRepo{pool: pool}
-}
-
-var _ port.UserRepo = (*UserRepo)(nil)
-
-func (r *UserRepo) List(ctx context.Context, params port.OffsetParams) (*domain.UserPage, error) {
-	col, ok := userSortColumn[params.Sort]
-	if !ok {
-		col = "id"
-	}
-	ord := "ASC"
-	if params.Order == "desc" {
-		ord = "DESC"
-	}
-	limit := db.ClampLimit(params.Limit, 50, 200)
-	offset := db.ClampOffset(params.Offset)
-
-	sql := fmt.Sprintf(`
-		SELECT id, name, password, is_admin, can_create, is_blocked,
-		       COUNT(*) OVER() AS total
-		FROM core.users
-		ORDER BY %s %s
-		LIMIT $1 OFFSET $2`, col, ord)
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, limit, offset)
-	if err != nil {
-		return nil, fmt.Errorf("UserRepo.List: %w", err)
-	}
-	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[userRowWithTotal])
-	if err != nil {
-		return nil, fmt.Errorf("UserRepo.List scan: %w", err)
-	}
-
-	page := &domain.UserPage{Offset: offset, Limit: limit}
-	if len(collected) > 0 {
-		page.Total = collected[0].Total
-	}
-	page.Items = make([]domain.User, len(collected))
-	for i, row := range collected {
-		page.Items[i] = toUser(row.userRow)
-	}
-	return page, nil
-}
-
-func (r *UserRepo) GetByID(ctx context.Context, id int16) (*domain.User, error) {
-	const sql = `
-		SELECT id, name, password, is_admin, can_create, is_blocked
-		FROM core.users WHERE id = $1`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, id)
-	if err != nil {
-		return nil, fmt.Errorf("UserRepo.GetByID: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[userRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("UserRepo.GetByID scan: %w", err)
-	}
-	u := toUser(row)
-	return &u, nil
-}
-
-func (r *UserRepo) GetByName(ctx context.Context, name string) (*domain.User, error) {
-	const sql = `
-		SELECT id, name, password, is_admin, can_create, is_blocked
-		FROM core.users WHERE name = $1`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, name)
-	if err != nil {
-		return nil, fmt.Errorf("UserRepo.GetByName: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[userRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("UserRepo.GetByName scan: %w", err)
-	}
-	u := toUser(row)
-	return &u, nil
-}
-
-func (r *UserRepo) Create(ctx context.Context, u *domain.User) (*domain.User, error) {
-	const sql = `
-		INSERT INTO core.users (name, password, is_admin, can_create)
-		VALUES ($1, $2, $3, $4)
-		RETURNING id, name, password, is_admin, can_create, is_blocked`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, u.Name, u.Password, u.IsAdmin, u.CanCreate)
-	if err != nil {
-		return nil, fmt.Errorf("UserRepo.Create: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[userRow])
-	if err != nil {
-		return nil, fmt.Errorf("UserRepo.Create scan: %w", err)
-	}
-	created := toUser(row)
-	return &created, nil
-}
-
-func (r *UserRepo) Update(ctx context.Context, id int16, u *domain.User) (*domain.User, error) {
-	const sql = `
-		UPDATE core.users
-		SET name = $2, password = $3, is_admin = $4, can_create = $5, is_blocked = $6
-		WHERE id = $1
-		RETURNING id, name, password, is_admin, can_create, is_blocked`
-
-	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, sql, id, u.Name, u.Password, u.IsAdmin, u.CanCreate, u.IsBlocked)
-	if err != nil {
-		return nil, fmt.Errorf("UserRepo.Update: %w", err)
-	}
-	row, err := pgx.CollectOneRow(rows, pgx.RowToStructByName[userRow])
-	if err != nil {
-		if errors.Is(err, pgx.ErrNoRows) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("UserRepo.Update scan: %w", err)
-	}
-	updated := toUser(row)
-	return &updated, nil
-}
-
-func (r *UserRepo) Delete(ctx context.Context, id int16) error {
-	const sql = `DELETE FROM core.users WHERE id = $1`
-	q := connOrTx(ctx, r.pool)
-	tag, err := q.Exec(ctx, sql, id)
-	if err != nil {
-		return fmt.Errorf("UserRepo.Delete: %w", err)
-	}
-	if tag.RowsAffected() == 0 {
-		return domain.ErrNotFound
-	}
-	return nil
-}
--- a/backend/internal/domain/acl.go
+++ b/backend/internal/domain/acl.go
@ -1,19 +0,0 @@
-package domain
-
-import "github.com/google/uuid"
-
-// ObjectType is a reference entity (file, tag, category, pool).
-type ObjectType struct {
-	ID   int16
-	Name string
-}
-
-// Permission represents a per-object access entry for a user.
-type Permission struct {
-	UserID        int16
-	UserName      string // denormalized
-	ObjectTypeID  int16
-	ObjectID      uuid.UUID
-	CanView       bool
-	CanEdit       bool
-}
--- a/backend/internal/domain/audit.go
+++ b/backend/internal/domain/audit.go
@ -1,46 +0,0 @@
-package domain
-
-import (
-	"encoding/json"
-	"time"
-
-	"github.com/google/uuid"
-)
-
-// ActionType is a reference entity for auditable user actions.
-type ActionType struct {
-	ID   int16
-	Name string
-}
-
-// AuditEntry is a single audit log record.
-type AuditEntry struct {
-	ID           int64
-	UserID       int16
-	UserName     string // denormalized
-	Action       string // action type name, e.g. "file_create"
-	ObjectType   *string
-	ObjectID     *uuid.UUID
-	Details      json.RawMessage
-	PerformedAt  time.Time
-}
-
-// AuditPage is an offset-based page of audit log entries.
-type AuditPage struct {
-	Items  []AuditEntry
-	Total  int
-	Offset int
-	Limit  int
-}
-
-// AuditFilter holds filter parameters for querying the audit log.
-type AuditFilter struct {
-	UserID     *int16
-	Action     string
-	ObjectType string
-	ObjectID   *uuid.UUID
-	From       *time.Time
-	To         *time.Time
-	Offset     int
-	Limit      int
-}
--- a/backend/internal/domain/category.go
+++ b/backend/internal/domain/category.go
@ -1,29 +0,0 @@
-package domain
-
-import (
-	"encoding/json"
-	"time"
-
-	"github.com/google/uuid"
-)
-
-// Category is a logical grouping of tags.
-type Category struct {
-	ID          uuid.UUID
-	Name        string
-	Notes       *string
-	Color       *string // 6-char hex
-	Metadata    json.RawMessage
-	CreatorID   int16
-	CreatorName string // denormalized
-	IsPublic    bool
-	CreatedAt   time.Time // extracted from UUID v7 via UUIDCreatedAt
-}
-
-// CategoryOffsetPage is an offset-based page of categories.
-type CategoryOffsetPage struct {
-	Items  []Category
-	Total  int
-	Offset int
-	Limit  int
-}
--- a/backend/internal/domain/context.go
+++ b/backend/internal/domain/context.go
@ -1,32 +0,0 @@
-package domain
-
-import "context"
-
-type ctxKey int
-
-const userKey ctxKey = iota
-
-type contextUser struct {
-	ID        int16
-	IsAdmin   bool
-	SessionID int
-}
-
-// WithUser stores user identity and current session ID in ctx.
-func WithUser(ctx context.Context, userID int16, isAdmin bool, sessionID int) context.Context {
-	return context.WithValue(ctx, userKey, contextUser{
-		ID:        userID,
-		IsAdmin:   isAdmin,
-		SessionID: sessionID,
-	})
-}
-
-// UserFromContext retrieves user identity from ctx.
-// Returns zero values if no user is stored.
-func UserFromContext(ctx context.Context) (userID int16, isAdmin bool, sessionID int) {
-	u, ok := ctx.Value(userKey).(contextUser)
-	if !ok {
-		return 0, false, 0
-	}
-	return u.ID, u.IsAdmin, u.SessionID
-}
--- a/docs/reference/backend/internal/domain/domain.go
+++ b/docs/reference/backend/internal/domain/domain.go
@ -1,122 +1,119 @@
-package domain
-
-import (
-	"encoding/json"
-	"time"
-
-	"github.com/jackc/pgx/v5/pgtype"
-)
-
-type User struct {
-	Name      string `json:"name"`
-	IsAdmin   bool   `json:"isAdmin"`
-	CanCreate bool   `json:"canCreate"`
-}
-
-type MIME struct {
-	Name      string `json:"name"`
-	Extension string `json:"extension"`
-}
-
-type (
-	CategoryCore struct {
-		ID    string      `json:"id"`
-		Name  string      `json:"name"`
-		Color pgtype.Text `json:"color"`
-	}
-	CategoryItem struct {
-		CategoryCore
-	}
-	CategoryFull struct {
-		CategoryCore
-		CreatedAt time.Time   `json:"createdAt"`
-		Creator   User        `json:"creator"`
-		Notes     pgtype.Text `json:"notes"`
-	}
-)
-
-type (
-	FileCore struct {
-		ID   string      `json:"id"`
-		Name pgtype.Text `json:"name"`
-		MIME MIME        `json:"mime"`
-	}
-	FileItem struct {
-		FileCore
-		CreatedAt time.Time `json:"createdAt"`
-		Creator   User      `json:"creator"`
-	}
-	FileFull struct {
-		FileCore
-		CreatedAt time.Time       `json:"createdAt"`
-		Creator   User            `json:"creator"`
-		Notes     pgtype.Text     `json:"notes"`
-		Metadata  json.RawMessage `json:"metadata"`
-		Tags      []TagCore       `json:"tags"`
-		Viewed    int             `json:"viewed"`
-	}
-)
-
-type (
-	TagCore struct {
-		ID    string      `json:"id"`
-		Name  string      `json:"name"`
-		Color pgtype.Text `json:"color"`
-	}
-	TagItem struct {
-		TagCore
-		Category CategoryCore `json:"category"`
-	}
-	TagFull struct {
-		TagCore
-		Category  CategoryCore `json:"category"`
-		CreatedAt time.Time    `json:"createdAt"`
-		Creator   User         `json:"creator"`
-		Notes     pgtype.Text  `json:"notes"`
-		UsedIncl  int          `json:"usedIncl"`
-		UsedExcl  int          `json:"usedExcl"`
-	}
-)
-
-type Autotag struct {
-	TriggerTag TagCore `json:"triggerTag"`
-	AddTag     TagCore `json:"addTag"`
-	IsActive   bool    `json:"isActive"`
-}
-
-type (
-	PoolCore struct {
-		ID   string `json:"id"`
-		Name string `json:"name"`
-	}
-	PoolItem struct {
-		PoolCore
-	}
-	PoolFull struct {
-		PoolCore
-		CreatedAt time.Time   `json:"createdAt"`
-		Creator   User        `json:"creator"`
-		Notes     pgtype.Text `json:"notes"`
-		Viewed    int         `json:"viewed"`
-	}
-)
-
-type Session struct {
-	ID           int       `json:"id"`
-	UserAgent    string    `json:"userAgent"`
-	StartedAt    time.Time `json:"startedAt"`
-	ExpiresAt    time.Time `json:"expiresAt"`
-	LastActivity time.Time `json:"lastActivity"`
-}
-
-type Pagination struct {
-	Total  int `json:"total"`
-	Offset int `json:"offset"`
-	Limit  int `json:"limit"`
-	Count  int `json:"count"`
-}
-
-type Slice[T any] struct {
-	Pagination Pagination `json:"pagination"`
-	Data       []T        `json:"data"`
-}
+package domain
+
+import (
+	"encoding/json"
+	"time"
+)
+
+type User struct {
+	Name      string `json:"name"`
+	IsAdmin   bool   `json:"isAdmin"`
+	CanCreate bool   `json:"canCreate"`
+}
+
+type MIME struct {
+	Name      string `json:"name"`
+	Extension string `json:"extension"`
+}
+
+type (
+	CategoryCore struct {
+		ID    *string `json:"id"`
+		Name  *string `json:"name"`
+		Color *string `json:"color"`
+	}
+	CategoryItem struct {
+		CategoryCore
+	}
+	CategoryFull struct {
+		CategoryCore
+		CreatedAt time.Time `json:"createdAt"`
+		Creator   User      `json:"creator"`
+		Notes     *string   `json:"notes"`
+	}
+)
+
+type (
+	FileCore struct {
+		ID   string  `json:"id"`
+		Name *string `json:"name"`
+		MIME MIME    `json:"mime"`
+	}
+	FileItem struct {
+		FileCore
+		CreatedAt time.Time `json:"createdAt"`
+		Creator   User      `json:"creator"`
+	}
+	FileFull struct {
+		FileCore
+		CreatedAt time.Time       `json:"createdAt"`
+		Creator   User            `json:"creator"`
+		Notes     *string         `json:"notes"`
+		Metadata  json.RawMessage `json:"metadata"`
+		Viewed    int             `json:"viewed"`
+	}
+)
+
+type (
+	TagCore struct {
+		ID    string  `json:"id"`
+		Name  string  `json:"name"`
+		Color *string `json:"color"`
+	}
+	TagItem struct {
+		TagCore
+		Category CategoryCore `json:"category"`
+	}
+	TagFull struct {
+		TagCore
+		Category  CategoryCore `json:"category"`
+		CreatedAt time.Time    `json:"createdAt"`
+		Creator   User         `json:"creator"`
+		Notes     *string      `json:"notes"`
+		UsedIncl  int          `json:"usedIncl"`
+		UsedExcl  int          `json:"usedExcl"`
+	}
+)
+
+type Autotag struct {
+	TriggerTag TagCore `json:"triggerTag"`
+	AddTag     TagCore `json:"addTag"`
+	IsActive   bool    `json:"isActive"`
+}
+
+type (
+	PoolCore struct {
+		ID   string `json:"id"`
+		Name string `json:"name"`
+	}
+	PoolItem struct {
+		PoolCore
+	}
+	PoolFull struct {
+		PoolCore
+		CreatedAt time.Time `json:"createdAt"`
+		Creator   User      `json:"creator"`
+		Notes     *string   `json:"notes"`
+		Viewed    int       `json:"viewed"`
+	}
+)
+
+type Session struct {
+	ID           int       `json:"id"`
+	UserAgent    string    `json:"userAgent"`
+	StartedAt    time.Time `json:"startedAt"`
+	ExpiresAt    time.Time `json:"expiresAt"`
+	LastActivity time.Time `json:"lastActivity"`
+}
+
+type Pagination struct {
+	Total  int `json:"total"`
+	Offset int `json:"offset"`
+	Limit  int `json:"limit"`
+	Count  int `json:"count"`
+}
+
+type Slice[T any] struct {
+	Pagination Pagination `json:"pagination"`
+	Data       []T        `json:"data"`
+}
--- a/backend/internal/domain/errors.go
+++ b/backend/internal/domain/errors.go
@ -1,21 +1,65 @@
 package domain

-// DomainError is a typed domain error with a stable machine-readable code.
-// Handlers map these codes to HTTP status codes.
+import "fmt"
+
+type ErrorCode string
+
+const (
+	// File errors
+	ErrCodeFileNotFound     ErrorCode = "FILE_NOT_FOUND"
+	ErrCodeMIMENotSupported ErrorCode = "MIME_NOT_SUPPORTED"
+
+	// Tag errors
+	ErrCodeTagNotFound ErrorCode = "TAG_NOT_FOUND"
+
+	// General errors
+	ErrCodeBadRequest ErrorCode = "BAD_REQUEST"
+	ErrCodeInternal   ErrorCode = "INTERNAL_SERVER_ERROR"
+)
+
 type DomainError struct {
-	code    string
-	message string
+	Err     error     `json:"-"`
+	Code    ErrorCode `json:"code"`
+	Message string    `json:"message"`
+	Details []any     `json:"-"`
 }

-func (e *DomainError) Error() string { return e.message }
-func (e *DomainError) Code() string  { return e.code }
+func (e *DomainError) Wrap(err error) *DomainError {
+	e.Err = err
+	return e
+}

-// Sentinel domain errors. Use errors.Is(err, domain.ErrNotFound) for matching.
-var (
-	ErrNotFound        = &DomainError{"not_found", "not found"}
-	ErrForbidden       = &DomainError{"forbidden", "forbidden"}
-	ErrUnauthorized    = &DomainError{"unauthorized", "unauthorized"}
-	ErrConflict        = &DomainError{"conflict", "conflict"}
-	ErrValidation      = &DomainError{"validation_error", "validation error"}
-	ErrUnsupportedMIME = &DomainError{"unsupported_mime", "unsupported MIME type"}
-)
+func NewErrorFileNotFound(file_id string) *DomainError {
+	return &DomainError{
+		Code:    ErrCodeFileNotFound,
+		Message: fmt.Sprintf("File not found: %q", file_id),
+	}
+}
+
+func NewErrorMIMENotSupported(mime string) *DomainError {
+	return &DomainError{
+		Code:    ErrCodeMIMENotSupported,
+		Message: fmt.Sprintf("MIME not supported: %q", mime),
+	}
+}
+
+func NewErrorTagNotFound(tag_id string) *DomainError {
+	return &DomainError{
+		Code:    ErrCodeTagNotFound,
+		Message: fmt.Sprintf("Tag not found: %q", tag_id),
+	}
+}
+
+func NewErrorBadRequest(message string) *DomainError {
+	return &DomainError{
+		Code:    ErrCodeBadRequest,
+		Message: message,
+	}
+}
+
+func NewErrorUnexpected() *DomainError {
+	return &DomainError{
+		Code:    ErrCodeInternal,
+		Message: "An unexpected error occured",
+	}
+}
--- a/backend/internal/domain/file.go
+++ b/backend/internal/domain/file.go
@ -1,67 +0,0 @@
-package domain
-
-import (
-	"encoding/json"
-	"time"
-
-	"github.com/google/uuid"
-)
-
-// MIMEType holds MIME whitelist data.
-type MIMEType struct {
-	ID        int16
-	Name      string
-	Extension string
-}
-
-// File represents a managed file record.
-type File struct {
-	ID              uuid.UUID
-	OriginalName    *string
-	MIMEType        string // denormalized from core.mime_types
-	MIMEExtension   string // denormalized from core.mime_types
-	ContentDatetime time.Time
-	Notes           *string
-	Metadata        json.RawMessage
-	EXIF            json.RawMessage
-	PHash           *int64
-	CreatorID       int16
-	CreatorName     string // denormalized from core.users
-	IsPublic        bool
-	IsDeleted       bool
-	CreatedAt       time.Time // extracted from UUID v7 via UUIDCreatedAt
-	Tags            []Tag     // loaded with the file
-}
-
-// FileListParams holds all parameters for listing/filtering files.
-type FileListParams struct {
-	// Pagination
-	Cursor    string
-	Direction string // "forward" or "backward"
-	Anchor    *uuid.UUID
-	Limit     int
-
-	// Sorting
-	Sort  string // "content_datetime" | "created" | "original_name" | "mime"
-	Order string // "asc" | "desc"
-
-	// Filtering
-	Filter string // filter DSL expression
-	Search string // substring match on original_name
-	Trash  bool   // if true, return only soft-deleted files
-}
-
-// FilePage is the result of a cursor-based file listing.
-type FilePage struct {
-	Items      []File
-	NextCursor *string
-	PrevCursor *string
-}
-
-// UUIDCreatedAt extracts the creation timestamp embedded in a UUID v7.
-// UUID v7 stores Unix milliseconds in the most-significant 48 bits.
-func UUIDCreatedAt(id uuid.UUID) time.Time {
-	ms := int64(id[0])<<40 | int64(id[1])<<32 | int64(id[2])<<24 |
-		int64(id[3])<<16 | int64(id[4])<<8 | int64(id[5])
-	return time.Unix(ms/1000, (ms%1000)*int64(time.Millisecond)).UTC()
-}
--- a/backend/internal/domain/pool.go
+++ b/backend/internal/domain/pool.go
@ -1,41 +0,0 @@
-package domain
-
-import (
-	"encoding/json"
-	"time"
-
-	"github.com/google/uuid"
-)
-
-// Pool is an ordered collection of files.
-type Pool struct {
-	ID          uuid.UUID
-	Name        string
-	Notes       *string
-	Metadata    json.RawMessage
-	CreatorID   int16
-	CreatorName string // denormalized
-	IsPublic    bool
-	FileCount   int
-	CreatedAt   time.Time // extracted from UUID v7 via UUIDCreatedAt
-}
-
-// PoolFile is a File with its ordering position within a pool.
-type PoolFile struct {
-	File
-	Position int
-}
-
-// PoolFilePage is the result of a cursor-based pool file listing.
-type PoolFilePage struct {
-	Items      []PoolFile
-	NextCursor *string
-}
-
-// PoolOffsetPage is an offset-based page of pools.
-type PoolOffsetPage struct {
-	Items  []Pool
-	Total  int
-	Offset int
-	Limit  int
-}
--- a/backend/internal/domain/repositories.go
+++ b/backend/internal/domain/repositories.go
@ -0,0 +1,17 @@
+package domain
+
+import (
+	"context"
+	"encoding/json"
+	"time"
+)
+
+type FileRepository interface {
+	GetAccess(ctx context.Context, user_id int, file_id string) (canView, canEdit bool, domainErr *DomainError)
+	GetSlice(ctx context.Context, user_id int, filter, sort string, limit, offset int) (files Slice[FileItem], domainErr *DomainError)
+	Get(ctx context.Context, user_id int, file_id string) (file FileFull, domainErr *DomainError)
+	Add(ctx context.Context, user_id int, name, mime string, datetime time.Time, notes string, metadata json.RawMessage) (file FileCore, domainErr *DomainError)
+	Update(ctx context.Context, file_id string, updates map[string]interface{}) (domainErr *DomainError)
+	Delete(ctx context.Context, file_id string) (domainErr *DomainError)
+	GetTags(ctx context.Context, user_id int, file_id string) (tags []TagItem, domainErr *DomainError)
+}
--- a/backend/internal/domain/tag.go
+++ b/backend/internal/domain/tag.go
@ -1,41 +0,0 @@
-package domain
-
-import (
-	"encoding/json"
-	"time"
-
-	"github.com/google/uuid"
-)
-
-// Tag represents a file label.
-type Tag struct {
-	ID            uuid.UUID
-	Name          string
-	Notes         *string
-	Color         *string // 6-char hex, e.g. "5DCAA5"
-	CategoryID    *uuid.UUID
-	CategoryName  *string // denormalized
-	CategoryColor *string // denormalized
-	Metadata      json.RawMessage
-	CreatorID     int16
-	CreatorName   string // denormalized
-	IsPublic      bool
-	CreatedAt     time.Time // extracted from UUID v7 via UUIDCreatedAt
-}
-
-// TagRule defines an auto-tagging rule: when WhenTagID is applied,
-// ThenTagID is automatically applied as well.
-type TagRule struct {
-	WhenTagID   uuid.UUID
-	ThenTagID   uuid.UUID
-	ThenTagName string // denormalized
-	IsActive    bool
-}
-
-// TagOffsetPage is an offset-based page of tags.
-type TagOffsetPage struct {
-	Items  []Tag
-	Total  int
-	Offset int
-	Limit  int
-}
--- a/backend/internal/domain/user.go
+++ b/backend/internal/domain/user.go
@ -1,39 +0,0 @@
-package domain
-
-import "time"
-
-// User is an application user.
-type User struct {
-	ID        int16
-	Name      string
-	Password  string // bcrypt hash; only populated when needed for auth
-	IsAdmin   bool
-	CanCreate bool
-	IsBlocked bool
-}
-
-// Session is an active user session.
-type Session struct {
-	ID           int
-	TokenHash    string
-	UserID       int16
-	UserAgent    string
-	StartedAt    time.Time
-	ExpiresAt    *time.Time
-	LastActivity time.Time
-	IsCurrent    bool // true when this session matches the caller's token
-}
-
-// UserPage is an offset-based page of users.
-type UserPage struct {
-	Items  []User
-	Total  int
-	Offset int
-	Limit  int
-}
-
-// SessionList is a list of sessions with a total count.
-type SessionList struct {
-	Items []Session
-	Total int
-}
--- a/backend/internal/handler/acl_handler.go
+++ b/backend/internal/handler/acl_handler.go
@ -1,144 +0,0 @@
-package handler
-
-import (
-	"net/http"
-
-	"github.com/gin-gonic/gin"
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/service"
-)
-
-// objectTypeIDs maps the URL segment to the object_type PK in core.object_types.
-// Row order matches 007_seed_data.sql: file=1, tag=2, category=3, pool=4.
-var objectTypeIDs = map[string]int16{
-	"file":     1,
-	"tag":      2,
-	"category": 3,
-	"pool":     4,
-}
-
-// ACLHandler handles GET/PUT /acl/:object_type/:object_id.
-type ACLHandler struct {
-	aclSvc *service.ACLService
-}
-
-// NewACLHandler creates an ACLHandler.
-func NewACLHandler(aclSvc *service.ACLService) *ACLHandler {
-	return &ACLHandler{aclSvc: aclSvc}
-}
-
-// ---------------------------------------------------------------------------
-// Response type
-// ---------------------------------------------------------------------------
-
-type permissionJSON struct {
-	UserID   int16  `json:"user_id"`
-	UserName string `json:"user_name"`
-	CanView  bool   `json:"can_view"`
-	CanEdit  bool   `json:"can_edit"`
-}
-
-func toPermissionJSON(p domain.Permission) permissionJSON {
-	return permissionJSON{
-		UserID:   p.UserID,
-		UserName: p.UserName,
-		CanView:  p.CanView,
-		CanEdit:  p.CanEdit,
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Helpers
-// ---------------------------------------------------------------------------
-
-func parseACLPath(c *gin.Context) (objectTypeID int16, objectID uuid.UUID, ok bool) {
-	typeStr := c.Param("object_type")
-	id, exists := objectTypeIDs[typeStr]
-	if !exists {
-		respondError(c, domain.ErrValidation)
-		return 0, uuid.UUID{}, false
-	}
-
-	objectID, err := uuid.Parse(c.Param("object_id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return 0, uuid.UUID{}, false
-	}
-
-	return id, objectID, true
-}
-
-// ---------------------------------------------------------------------------
-// GET /acl/:object_type/:object_id
-// ---------------------------------------------------------------------------
-
-func (h *ACLHandler) GetPermissions(c *gin.Context) {
-	objectTypeID, objectID, ok := parseACLPath(c)
-	if !ok {
-		return
-	}
-
-	perms, err := h.aclSvc.GetPermissions(c.Request.Context(), objectTypeID, objectID)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	out := make([]permissionJSON, len(perms))
-	for i, p := range perms {
-		out[i] = toPermissionJSON(p)
-	}
-	respondJSON(c, http.StatusOK, out)
-}
-
-// ---------------------------------------------------------------------------
-// PUT /acl/:object_type/:object_id
-// ---------------------------------------------------------------------------
-
-func (h *ACLHandler) SetPermissions(c *gin.Context) {
-	objectTypeID, objectID, ok := parseACLPath(c)
-	if !ok {
-		return
-	}
-
-	var body struct {
-		Permissions []struct {
-			UserID  int16 `json:"user_id"  binding:"required"`
-			CanView bool  `json:"can_view"`
-			CanEdit bool  `json:"can_edit"`
-		} `json:"permissions" binding:"required"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	perms := make([]domain.Permission, len(body.Permissions))
-	for i, p := range body.Permissions {
-		perms[i] = domain.Permission{
-			UserID:  p.UserID,
-			CanView: p.CanView,
-			CanEdit: p.CanEdit,
-		}
-	}
-
-	if err := h.aclSvc.SetPermissions(c.Request.Context(), objectTypeID, objectID, perms); err != nil {
-		respondError(c, err)
-		return
-	}
-
-	// Re-read to return the stored permissions (with UserName denormalized).
-	stored, err := h.aclSvc.GetPermissions(c.Request.Context(), objectTypeID, objectID)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	out := make([]permissionJSON, len(stored))
-	for i, p := range stored {
-		out[i] = toPermissionJSON(p)
-	}
-	respondJSON(c, http.StatusOK, out)
-}
--- a/backend/internal/handler/audit_handler.go
+++ b/backend/internal/handler/audit_handler.go
@ -1,120 +0,0 @@
-package handler
-
-import (
-	"net/http"
-	"strconv"
-	"time"
-
-	"github.com/gin-gonic/gin"
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/service"
-)
-
-// AuditHandler handles GET /audit.
-type AuditHandler struct {
-	auditSvc *service.AuditService
-}
-
-// NewAuditHandler creates an AuditHandler.
-func NewAuditHandler(auditSvc *service.AuditService) *AuditHandler {
-	return &AuditHandler{auditSvc: auditSvc}
-}
-
-// ---------------------------------------------------------------------------
-// Response type
-// ---------------------------------------------------------------------------
-
-type auditEntryJSON struct {
-	ID          int64   `json:"id"`
-	UserID      int16   `json:"user_id"`
-	UserName    string  `json:"user_name"`
-	Action      string  `json:"action"`
-	ObjectType  *string `json:"object_type"`
-	ObjectID    *string `json:"object_id"`
-	PerformedAt string  `json:"performed_at"`
-}
-
-func toAuditEntryJSON(e domain.AuditEntry) auditEntryJSON {
-	j := auditEntryJSON{
-		ID:          e.ID,
-		UserID:      e.UserID,
-		UserName:    e.UserName,
-		Action:      e.Action,
-		ObjectType:  e.ObjectType,
-		PerformedAt: e.PerformedAt.UTC().Format(time.RFC3339),
-	}
-	if e.ObjectID != nil {
-		s := e.ObjectID.String()
-		j.ObjectID = &s
-	}
-	return j
-}
-
-// ---------------------------------------------------------------------------
-// GET /audit  (admin)
-// ---------------------------------------------------------------------------
-
-func (h *AuditHandler) List(c *gin.Context) {
-	if !requireAdmin(c) {
-		return
-	}
-
-	filter := domain.AuditFilter{}
-
-	if s := c.Query("limit"); s != "" {
-		if n, err := strconv.Atoi(s); err == nil {
-			filter.Limit = n
-		}
-	}
-	if s := c.Query("offset"); s != "" {
-		if n, err := strconv.Atoi(s); err == nil {
-			filter.Offset = n
-		}
-	}
-	if s := c.Query("user_id"); s != "" {
-		if n, err := strconv.ParseInt(s, 10, 16); err == nil {
-			id := int16(n)
-			filter.UserID = &id
-		}
-	}
-	if s := c.Query("action"); s != "" {
-		filter.Action = s
-	}
-	if s := c.Query("object_type"); s != "" {
-		filter.ObjectType = s
-	}
-	if s := c.Query("object_id"); s != "" {
-		if id, err := uuid.Parse(s); err == nil {
-			filter.ObjectID = &id
-		}
-	}
-	if s := c.Query("from"); s != "" {
-		if t, err := time.Parse(time.RFC3339, s); err == nil {
-			filter.From = &t
-		}
-	}
-	if s := c.Query("to"); s != "" {
-		if t, err := time.Parse(time.RFC3339, s); err == nil {
-			filter.To = &t
-		}
-	}
-
-	page, err := h.auditSvc.Query(c.Request.Context(), filter)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]auditEntryJSON, len(page.Items))
-	for i, e := range page.Items {
-		items[i] = toAuditEntryJSON(e)
-	}
-	respondJSON(c, http.StatusOK, gin.H{
-		"items":  items,
-		"total":  page.Total,
-		"offset": page.Offset,
-		"limit":  page.Limit,
-	})
-}
--- a/backend/internal/handler/auth_handler.go
+++ b/backend/internal/handler/auth_handler.go
@ -1,140 +0,0 @@
-package handler
-
-import (
-	"net/http"
-	"strconv"
-
-	"github.com/gin-gonic/gin"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/service"
-)
-
-// AuthHandler handles all /auth endpoints.
-type AuthHandler struct {
-	authSvc *service.AuthService
-}
-
-// NewAuthHandler creates an AuthHandler backed by authSvc.
-func NewAuthHandler(authSvc *service.AuthService) *AuthHandler {
-	return &AuthHandler{authSvc: authSvc}
-}
-
-// Login handles POST /auth/login.
-func (h *AuthHandler) Login(c *gin.Context) {
-	var req struct {
-		Name     string `json:"name"     binding:"required"`
-		Password string `json:"password" binding:"required"`
-	}
-	if err := c.ShouldBindJSON(&req); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	pair, err := h.authSvc.Login(c.Request.Context(), req.Name, req.Password, c.GetHeader("User-Agent"))
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusOK, gin.H{
-		"access_token":  pair.AccessToken,
-		"refresh_token": pair.RefreshToken,
-		"expires_in":    pair.ExpiresIn,
-	})
-}
-
-// Refresh handles POST /auth/refresh.
-func (h *AuthHandler) Refresh(c *gin.Context) {
-	var req struct {
-		RefreshToken string `json:"refresh_token" binding:"required"`
-	}
-	if err := c.ShouldBindJSON(&req); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	pair, err := h.authSvc.Refresh(c.Request.Context(), req.RefreshToken, c.GetHeader("User-Agent"))
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusOK, gin.H{
-		"access_token":  pair.AccessToken,
-		"refresh_token": pair.RefreshToken,
-		"expires_in":    pair.ExpiresIn,
-	})
-}
-
-// Logout handles POST /auth/logout. Requires authentication.
-func (h *AuthHandler) Logout(c *gin.Context) {
-	_, _, sessionID := domain.UserFromContext(c.Request.Context())
-
-	if err := h.authSvc.Logout(c.Request.Context(), sessionID); err != nil {
-		respondError(c, err)
-		return
-	}
-
-	c.Status(http.StatusNoContent)
-}
-
-// ListSessions handles GET /auth/sessions. Requires authentication.
-func (h *AuthHandler) ListSessions(c *gin.Context) {
-	userID, _, sessionID := domain.UserFromContext(c.Request.Context())
-
-	list, err := h.authSvc.ListSessions(c.Request.Context(), userID, sessionID)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	type sessionItem struct {
-		ID           int    `json:"id"`
-		UserAgent    string `json:"user_agent"`
-		StartedAt    string `json:"started_at"`
-		ExpiresAt    any    `json:"expires_at"`
-		LastActivity string `json:"last_activity"`
-		IsCurrent    bool   `json:"is_current"`
-	}
-
-	items := make([]sessionItem, len(list.Items))
-	for i, s := range list.Items {
-		var expiresAt any
-		if s.ExpiresAt != nil {
-			expiresAt = s.ExpiresAt.Format("2006-01-02T15:04:05Z07:00")
-		}
-		items[i] = sessionItem{
-			ID:           s.ID,
-			UserAgent:    s.UserAgent,
-			StartedAt:    s.StartedAt.Format("2006-01-02T15:04:05Z07:00"),
-			ExpiresAt:    expiresAt,
-			LastActivity: s.LastActivity.Format("2006-01-02T15:04:05Z07:00"),
-			IsCurrent:    s.IsCurrent,
-		}
-	}
-
-	respondJSON(c, http.StatusOK, gin.H{
-		"items": items,
-		"total": list.Total,
-	})
-}
-
-// TerminateSession handles DELETE /auth/sessions/:id. Requires authentication.
-func (h *AuthHandler) TerminateSession(c *gin.Context) {
-	idStr := c.Param("id")
-	id, err := strconv.Atoi(idStr)
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	userID, isAdmin, _ := domain.UserFromContext(c.Request.Context())
-
-	if err := h.authSvc.TerminateSession(c.Request.Context(), userID, isAdmin, id); err != nil {
-		respondError(c, err)
-		return
-	}
-
-	c.Status(http.StatusNoContent)
-}
--- a/backend/internal/handler/category_handler.go
+++ b/backend/internal/handler/category_handler.go
@ -1,235 +0,0 @@
-package handler
-
-import (
-	"net/http"
-
-	"github.com/gin-gonic/gin"
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/service"
-)
-
-// CategoryHandler handles all /categories endpoints.
-type CategoryHandler struct {
-	categorySvc *service.CategoryService
-}
-
-// NewCategoryHandler creates a CategoryHandler.
-func NewCategoryHandler(categorySvc *service.CategoryService) *CategoryHandler {
-	return &CategoryHandler{categorySvc: categorySvc}
-}
-
-// ---------------------------------------------------------------------------
-// Response types
-// ---------------------------------------------------------------------------
-
-type categoryJSON struct {
-	ID          string  `json:"id"`
-	Name        string  `json:"name"`
-	Notes       *string `json:"notes"`
-	Color       *string `json:"color"`
-	CreatorID   int16   `json:"creator_id"`
-	CreatorName string  `json:"creator_name"`
-	IsPublic    bool    `json:"is_public"`
-	CreatedAt   string  `json:"created_at"`
-}
-
-func toCategoryJSON(c domain.Category) categoryJSON {
-	return categoryJSON{
-		ID:          c.ID.String(),
-		Name:        c.Name,
-		Notes:       c.Notes,
-		Color:       c.Color,
-		CreatorID:   c.CreatorID,
-		CreatorName: c.CreatorName,
-		IsPublic:    c.IsPublic,
-		CreatedAt:   c.CreatedAt.UTC().Format("2006-01-02T15:04:05Z"),
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Helpers
-// ---------------------------------------------------------------------------
-
-func parseCategoryID(c *gin.Context) (uuid.UUID, bool) {
-	id, err := uuid.Parse(c.Param("category_id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return uuid.UUID{}, false
-	}
-	return id, true
-}
-
-// ---------------------------------------------------------------------------
-// GET /categories
-// ---------------------------------------------------------------------------
-
-func (h *CategoryHandler) List(c *gin.Context) {
-	params := parseOffsetParams(c, "created")
-
-	page, err := h.categorySvc.List(c.Request.Context(), params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]categoryJSON, len(page.Items))
-	for i, cat := range page.Items {
-		items[i] = toCategoryJSON(cat)
-	}
-	respondJSON(c, http.StatusOK, gin.H{
-		"items":  items,
-		"total":  page.Total,
-		"offset": page.Offset,
-		"limit":  page.Limit,
-	})
-}
-
-// ---------------------------------------------------------------------------
-// POST /categories
-// ---------------------------------------------------------------------------
-
-func (h *CategoryHandler) Create(c *gin.Context) {
-	var body struct {
-		Name     string  `json:"name"      binding:"required"`
-		Notes    *string `json:"notes"`
-		Color    *string `json:"color"`
-		IsPublic *bool   `json:"is_public"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	created, err := h.categorySvc.Create(c.Request.Context(), service.CategoryParams{
-		Name:     body.Name,
-		Notes:    body.Notes,
-		Color:    body.Color,
-		IsPublic: body.IsPublic,
-	})
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	respondJSON(c, http.StatusCreated, toCategoryJSON(*created))
-}
-
-// ---------------------------------------------------------------------------
-// GET /categories/:category_id
-// ---------------------------------------------------------------------------
-
-func (h *CategoryHandler) Get(c *gin.Context) {
-	id, ok := parseCategoryID(c)
-	if !ok {
-		return
-	}
-
-	cat, err := h.categorySvc.Get(c.Request.Context(), id)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	respondJSON(c, http.StatusOK, toCategoryJSON(*cat))
-}
-
-// ---------------------------------------------------------------------------
-// PATCH /categories/:category_id
-// ---------------------------------------------------------------------------
-
-func (h *CategoryHandler) Update(c *gin.Context) {
-	id, ok := parseCategoryID(c)
-	if !ok {
-		return
-	}
-
-	// Use a raw map to detect explicitly-null fields.
-	var raw map[string]any
-	if err := c.ShouldBindJSON(&raw); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	params := service.CategoryParams{}
-
-	if v, ok := raw["name"]; ok {
-		if s, ok := v.(string); ok {
-			params.Name = s
-		}
-	}
-	if _, ok := raw["notes"]; ok {
-		if raw["notes"] == nil {
-			empty := ""
-			params.Notes = &empty
-		} else if s, ok := raw["notes"].(string); ok {
-			params.Notes = &s
-		}
-	}
-	if _, ok := raw["color"]; ok {
-		if raw["color"] == nil {
-			empty := ""
-			params.Color = &empty
-		} else if s, ok := raw["color"].(string); ok {
-			params.Color = &s
-		}
-	}
-	if v, ok := raw["is_public"]; ok {
-		if b, ok := v.(bool); ok {
-			params.IsPublic = &b
-		}
-	}
-
-	updated, err := h.categorySvc.Update(c.Request.Context(), id, params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	respondJSON(c, http.StatusOK, toCategoryJSON(*updated))
-}
-
-// ---------------------------------------------------------------------------
-// DELETE /categories/:category_id
-// ---------------------------------------------------------------------------
-
-func (h *CategoryHandler) Delete(c *gin.Context) {
-	id, ok := parseCategoryID(c)
-	if !ok {
-		return
-	}
-
-	if err := h.categorySvc.Delete(c.Request.Context(), id); err != nil {
-		respondError(c, err)
-		return
-	}
-	c.Status(http.StatusNoContent)
-}
-
-// ---------------------------------------------------------------------------
-// GET /categories/:category_id/tags
-// ---------------------------------------------------------------------------
-
-func (h *CategoryHandler) ListTags(c *gin.Context) {
-	id, ok := parseCategoryID(c)
-	if !ok {
-		return
-	}
-
-	params := parseOffsetParams(c, "created")
-
-	page, err := h.categorySvc.ListTags(c.Request.Context(), id, params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]tagJSON, len(page.Items))
-	for i, t := range page.Items {
-		items[i] = toTagJSON(t)
-	}
-	respondJSON(c, http.StatusOK, gin.H{
-		"items":  items,
-		"total":  page.Total,
-		"offset": page.Offset,
-		"limit":  page.Limit,
-	})
-}
--- a/backend/internal/handler/file_handler.go
+++ b/backend/internal/handler/file_handler.go
@ -1,645 +0,0 @@
-package handler
-
-import (
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/http"
-	"strconv"
-	"strings"
-	"time"
-
-	"github.com/gabriel-vasile/mimetype"
-	"github.com/gin-gonic/gin"
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/service"
-)
-
-// FileHandler handles all /files endpoints.
-type FileHandler struct {
-	fileSvc *service.FileService
-	tagSvc  *service.TagService
-}
-
-// NewFileHandler creates a FileHandler.
-func NewFileHandler(fileSvc *service.FileService, tagSvc *service.TagService) *FileHandler {
-	return &FileHandler{fileSvc: fileSvc, tagSvc: tagSvc}
-}
-
-// ---------------------------------------------------------------------------
-// Response types
-// ---------------------------------------------------------------------------
-
-type tagJSON struct {
-	ID            string  `json:"id"`
-	Name          string  `json:"name"`
-	Notes         *string `json:"notes"`
-	Color         *string `json:"color"`
-	CategoryID    *string `json:"category_id"`
-	CategoryName  *string `json:"category_name"`
-	CategoryColor *string `json:"category_color"`
-	CreatorID     int16   `json:"creator_id"`
-	CreatorName   string  `json:"creator_name"`
-	IsPublic      bool    `json:"is_public"`
-	CreatedAt     string  `json:"created_at"`
-}
-
-type fileJSON struct {
-	ID              string          `json:"id"`
-	OriginalName    *string         `json:"original_name"`
-	MIMEType        string          `json:"mime_type"`
-	MIMEExtension   string          `json:"mime_extension"`
-	ContentDatetime string          `json:"content_datetime"`
-	Notes           *string         `json:"notes"`
-	Metadata        json.RawMessage `json:"metadata"`
-	EXIF            json.RawMessage `json:"exif"`
-	PHash           *int64          `json:"phash"`
-	CreatorID       int16           `json:"creator_id"`
-	CreatorName     string          `json:"creator_name"`
-	IsPublic        bool            `json:"is_public"`
-	IsDeleted       bool            `json:"is_deleted"`
-	CreatedAt       string          `json:"created_at"`
-	Tags            []tagJSON       `json:"tags"`
-}
-
-func toTagJSON(t domain.Tag) tagJSON {
-	j := tagJSON{
-		ID:          t.ID.String(),
-		Name:        t.Name,
-		Notes:       t.Notes,
-		Color:       t.Color,
-		CategoryName:  t.CategoryName,
-		CategoryColor: t.CategoryColor,
-		CreatorID:   t.CreatorID,
-		CreatorName: t.CreatorName,
-		IsPublic:    t.IsPublic,
-		CreatedAt:   t.CreatedAt.Format(time.RFC3339),
-	}
-	if t.CategoryID != nil {
-		s := t.CategoryID.String()
-		j.CategoryID = &s
-	}
-	return j
-}
-
-func toFileJSON(f domain.File) fileJSON {
-	tags := make([]tagJSON, len(f.Tags))
-	for i, t := range f.Tags {
-		tags[i] = toTagJSON(t)
-	}
-	exif := f.EXIF
-	if exif == nil {
-		exif = json.RawMessage("{}")
-	}
-	return fileJSON{
-		ID:              f.ID.String(),
-		OriginalName:    f.OriginalName,
-		MIMEType:        f.MIMEType,
-		MIMEExtension:   f.MIMEExtension,
-		ContentDatetime: f.ContentDatetime.Format(time.RFC3339),
-		Notes:           f.Notes,
-		Metadata:        f.Metadata,
-		EXIF:            exif,
-		PHash:           f.PHash,
-		CreatorID:       f.CreatorID,
-		CreatorName:     f.CreatorName,
-		IsPublic:        f.IsPublic,
-		IsDeleted:       f.IsDeleted,
-		CreatedAt:       f.CreatedAt.Format(time.RFC3339),
-		Tags:            tags,
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Helper
-// ---------------------------------------------------------------------------
-
-func parseFileID(c *gin.Context) (uuid.UUID, bool) {
-	id, err := uuid.Parse(c.Param("id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return uuid.UUID{}, false
-	}
-	return id, true
-}
-
-// ---------------------------------------------------------------------------
-// GET /files
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) List(c *gin.Context) {
-	params := domain.FileListParams{
-		Cursor:    c.Query("cursor"),
-		Direction: c.DefaultQuery("direction", "forward"),
-		Sort:      c.DefaultQuery("sort", "created"),
-		Order:     c.DefaultQuery("order", "desc"),
-		Filter:    c.Query("filter"),
-		Search:    c.Query("search"),
-	}
-
-	if limitStr := c.Query("limit"); limitStr != "" {
-		n, err := strconv.Atoi(limitStr)
-		if err != nil || n < 1 || n > 200 {
-			respondError(c, domain.ErrValidation)
-			return
-		}
-		params.Limit = n
-	} else {
-		params.Limit = 50
-	}
-
-	if anchorStr := c.Query("anchor"); anchorStr != "" {
-		id, err := uuid.Parse(anchorStr)
-		if err != nil {
-			respondError(c, domain.ErrValidation)
-			return
-		}
-		params.Anchor = &id
-	}
-
-	if trashStr := c.Query("trash"); trashStr == "true" || trashStr == "1" {
-		params.Trash = true
-	}
-
-	page, err := h.fileSvc.List(c.Request.Context(), params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]fileJSON, len(page.Items))
-	for i, f := range page.Items {
-		items[i] = toFileJSON(f)
-	}
-
-	respondJSON(c, http.StatusOK, gin.H{
-		"items":       items,
-		"next_cursor": page.NextCursor,
-		"prev_cursor": page.PrevCursor,
-	})
-}
-
-// ---------------------------------------------------------------------------
-// POST /files  (multipart upload)
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) Upload(c *gin.Context) {
-	fh, err := c.FormFile("file")
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	src, err := fh.Open()
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	defer src.Close()
-
-	// Detect MIME from actual bytes (ignore client-supplied Content-Type).
-	mt, err := mimetype.DetectReader(src)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	// Rewind by reopening — FormFile gives a multipart.File which supports Seek.
-	if _, err := src.Seek(0, io.SeekStart); err != nil {
-		respondError(c, err)
-		return
-	}
-	mimeStr := strings.SplitN(mt.String(), ";", 2)[0]
-
-	params := service.UploadParams{
-		Reader:   src,
-		MIMEType: mimeStr,
-		IsPublic: c.PostForm("is_public") == "true",
-	}
-
-	if name := fh.Filename; name != "" {
-		params.OriginalName = &name
-	}
-	if notes := c.PostForm("notes"); notes != "" {
-		params.Notes = &notes
-	}
-	if metaStr := c.PostForm("metadata"); metaStr != "" {
-		params.Metadata = json.RawMessage(metaStr)
-	}
-	if dtStr := c.PostForm("content_datetime"); dtStr != "" {
-		t, err := time.Parse(time.RFC3339, dtStr)
-		if err != nil {
-			respondError(c, domain.ErrValidation)
-			return
-		}
-		params.ContentDatetime = &t
-	}
-	if tagIDsStr := c.PostForm("tag_ids"); tagIDsStr != "" {
-		for _, raw := range strings.Split(tagIDsStr, ",") {
-			raw = strings.TrimSpace(raw)
-			if raw == "" {
-				continue
-			}
-			id, err := uuid.Parse(raw)
-			if err != nil {
-				respondError(c, domain.ErrValidation)
-				return
-			}
-			params.TagIDs = append(params.TagIDs, id)
-		}
-	}
-
-	f, err := h.fileSvc.Upload(c.Request.Context(), params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusCreated, toFileJSON(*f))
-}
-
-// ---------------------------------------------------------------------------
-// GET /files/:id
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) GetMeta(c *gin.Context) {
-	id, ok := parseFileID(c)
-	if !ok {
-		return
-	}
-
-	f, err := h.fileSvc.Get(c.Request.Context(), id)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusOK, toFileJSON(*f))
-}
-
-// ---------------------------------------------------------------------------
-// PATCH /files/:id
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) UpdateMeta(c *gin.Context) {
-	id, ok := parseFileID(c)
-	if !ok {
-		return
-	}
-
-	var body struct {
-		OriginalName    *string         `json:"original_name"`
-		ContentDatetime *string         `json:"content_datetime"`
-		Notes           *string         `json:"notes"`
-		Metadata        json.RawMessage `json:"metadata"`
-		IsPublic        *bool           `json:"is_public"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	params := service.UpdateParams{
-		OriginalName: body.OriginalName,
-		Notes:        body.Notes,
-		Metadata:     body.Metadata,
-		IsPublic:     body.IsPublic,
-	}
-	if body.ContentDatetime != nil {
-		t, err := time.Parse(time.RFC3339, *body.ContentDatetime)
-		if err != nil {
-			respondError(c, domain.ErrValidation)
-			return
-		}
-		params.ContentDatetime = &t
-	}
-
-	f, err := h.fileSvc.Update(c.Request.Context(), id, params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusOK, toFileJSON(*f))
-}
-
-// ---------------------------------------------------------------------------
-// DELETE /files/:id  (soft-delete)
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) SoftDelete(c *gin.Context) {
-	id, ok := parseFileID(c)
-	if !ok {
-		return
-	}
-
-	if err := h.fileSvc.Delete(c.Request.Context(), id); err != nil {
-		respondError(c, err)
-		return
-	}
-
-	c.Status(http.StatusNoContent)
-}
-
-// ---------------------------------------------------------------------------
-// GET /files/:id/content
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) GetContent(c *gin.Context) {
-	id, ok := parseFileID(c)
-	if !ok {
-		return
-	}
-
-	res, err := h.fileSvc.GetContent(c.Request.Context(), id)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	defer res.Body.Close()
-
-	c.Header("Content-Type", res.MIMEType)
-	if res.OriginalName != nil {
-		c.Header("Content-Disposition",
-			fmt.Sprintf("attachment; filename=%q", *res.OriginalName))
-	}
-	c.Status(http.StatusOK)
-	io.Copy(c.Writer, res.Body) //nolint:errcheck
-}
-
-// ---------------------------------------------------------------------------
-// PUT /files/:id/content  (replace)
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) ReplaceContent(c *gin.Context) {
-	id, ok := parseFileID(c)
-	if !ok {
-		return
-	}
-
-	fh, err := c.FormFile("file")
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	src, err := fh.Open()
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	defer src.Close()
-
-	mt, err := mimetype.DetectReader(src)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	if _, err := src.Seek(0, io.SeekStart); err != nil {
-		respondError(c, err)
-		return
-	}
-	mimeStr := strings.SplitN(mt.String(), ";", 2)[0]
-
-	name := fh.Filename
-	params := service.UploadParams{
-		Reader:       src,
-		MIMEType:     mimeStr,
-		OriginalName: &name,
-	}
-
-	f, err := h.fileSvc.Replace(c.Request.Context(), id, params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusOK, toFileJSON(*f))
-}
-
-// ---------------------------------------------------------------------------
-// GET /files/:id/thumbnail
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) GetThumbnail(c *gin.Context) {
-	id, ok := parseFileID(c)
-	if !ok {
-		return
-	}
-
-	rc, err := h.fileSvc.GetThumbnail(c.Request.Context(), id)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	defer rc.Close()
-
-	c.Header("Content-Type", "image/jpeg")
-	c.Status(http.StatusOK)
-	io.Copy(c.Writer, rc) //nolint:errcheck
-}
-
-// ---------------------------------------------------------------------------
-// GET /files/:id/preview
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) GetPreview(c *gin.Context) {
-	id, ok := parseFileID(c)
-	if !ok {
-		return
-	}
-
-	rc, err := h.fileSvc.GetPreview(c.Request.Context(), id)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	defer rc.Close()
-
-	c.Header("Content-Type", "image/jpeg")
-	c.Status(http.StatusOK)
-	io.Copy(c.Writer, rc) //nolint:errcheck
-}
-
-// ---------------------------------------------------------------------------
-// POST /files/:id/restore
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) Restore(c *gin.Context) {
-	id, ok := parseFileID(c)
-	if !ok {
-		return
-	}
-
-	f, err := h.fileSvc.Restore(c.Request.Context(), id)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusOK, toFileJSON(*f))
-}
-
-// ---------------------------------------------------------------------------
-// DELETE /files/:id/permanent
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) PermanentDelete(c *gin.Context) {
-	id, ok := parseFileID(c)
-	if !ok {
-		return
-	}
-
-	if err := h.fileSvc.PermanentDelete(c.Request.Context(), id); err != nil {
-		respondError(c, err)
-		return
-	}
-
-	c.Status(http.StatusNoContent)
-}
-
-// ---------------------------------------------------------------------------
-// POST /files/bulk/tags
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) BulkSetTags(c *gin.Context) {
-	var body struct {
-		FileIDs []string `json:"file_ids" binding:"required"`
-		Action  string   `json:"action"   binding:"required"`
-		TagIDs  []string `json:"tag_ids"  binding:"required"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-	if body.Action != "add" && body.Action != "remove" {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	fileIDs, err := parseUUIDs(body.FileIDs)
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-	tagIDs, err := parseUUIDs(body.TagIDs)
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	applied, err := h.tagSvc.BulkSetTags(c.Request.Context(), fileIDs, body.Action, tagIDs)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	strs := make([]string, len(applied))
-	for i, id := range applied {
-		strs[i] = id.String()
-	}
-	respondJSON(c, http.StatusOK, gin.H{"applied_tag_ids": strs})
-}
-
-// ---------------------------------------------------------------------------
-// POST /files/bulk/delete
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) BulkDelete(c *gin.Context) {
-	var body struct {
-		FileIDs []string `json:"file_ids" binding:"required"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	fileIDs, err := parseUUIDs(body.FileIDs)
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	if err := h.fileSvc.BulkDelete(c.Request.Context(), fileIDs); err != nil {
-		respondError(c, err)
-		return
-	}
-
-	c.Status(http.StatusNoContent)
-}
-
-// ---------------------------------------------------------------------------
-// POST /files/bulk/common-tags
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) CommonTags(c *gin.Context) {
-	var body struct {
-		FileIDs []string `json:"file_ids" binding:"required"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	fileIDs, err := parseUUIDs(body.FileIDs)
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	common, partial, err := h.tagSvc.CommonTags(c.Request.Context(), fileIDs)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	toStrs := func(tags []domain.Tag) []string {
-		s := make([]string, len(tags))
-		for i, t := range tags {
-			s[i] = t.ID.String()
-		}
-		return s
-	}
-
-	respondJSON(c, http.StatusOK, gin.H{
-		"common_tag_ids":  toStrs(common),
-		"partial_tag_ids": toStrs(partial),
-	})
-}
-
-// ---------------------------------------------------------------------------
-// POST /files/import
-// ---------------------------------------------------------------------------
-
-func (h *FileHandler) Import(c *gin.Context) {
-	var body struct {
-		Path string `json:"path"`
-	}
-	// Body is optional; ignore bind errors.
-	_ = c.ShouldBindJSON(&body)
-
-	result, err := h.fileSvc.Import(c.Request.Context(), body.Path)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusOK, result)
-}
-
-// ---------------------------------------------------------------------------
-// Helpers
-// ---------------------------------------------------------------------------
-
-func parseUUIDs(strs []string) ([]uuid.UUID, error) {
-	ids := make([]uuid.UUID, 0, len(strs))
-	for _, s := range strs {
-		id, err := uuid.Parse(s)
-		if err != nil {
-			return nil, err
-		}
-		ids = append(ids, id)
-	}
-	return ids, nil
-}
--- a/backend/internal/handler/middleware.go
+++ b/backend/internal/handler/middleware.go
@ -1,52 +0,0 @@
-package handler
-
-import (
-	"net/http"
-	"strings"
-
-	"github.com/gin-gonic/gin"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/service"
-)
-
-// AuthMiddleware validates Bearer JWTs and injects user identity into context.
-type AuthMiddleware struct {
-	authSvc *service.AuthService
-}
-
-// NewAuthMiddleware creates an AuthMiddleware backed by authSvc.
-func NewAuthMiddleware(authSvc *service.AuthService) *AuthMiddleware {
-	return &AuthMiddleware{authSvc: authSvc}
-}
-
-// Handle returns a Gin handler function that enforces authentication.
-// On success it calls c.Next(); on failure it aborts with 401 JSON.
-func (m *AuthMiddleware) Handle() gin.HandlerFunc {
-	return func(c *gin.Context) {
-		raw := c.GetHeader("Authorization")
-		if !strings.HasPrefix(raw, "Bearer ") {
-			c.JSON(http.StatusUnauthorized, errorBody{
-				Code:    domain.ErrUnauthorized.Code(),
-				Message: "authorization header missing or malformed",
-			})
-			c.Abort()
-			return
-		}
-		token := strings.TrimPrefix(raw, "Bearer ")
-
-		claims, err := m.authSvc.ParseAccessToken(token)
-		if err != nil {
-			c.JSON(http.StatusUnauthorized, errorBody{
-				Code:    domain.ErrUnauthorized.Code(),
-				Message: "invalid or expired token",
-			})
-			c.Abort()
-			return
-		}
-
-		ctx := domain.WithUser(c.Request.Context(), claims.UserID, claims.IsAdmin, claims.SessionID)
-		c.Request = c.Request.WithContext(ctx)
-		c.Next()
-	}
-}
--- a/backend/internal/handler/pool_handler.go
+++ b/backend/internal/handler/pool_handler.go
@ -1,356 +0,0 @@
-package handler
-
-import (
-	"net/http"
-	"strconv"
-	"time"
-
-	"github.com/gin-gonic/gin"
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-	"tanabata/backend/internal/service"
-)
-
-// PoolHandler handles all /pools endpoints.
-type PoolHandler struct {
-	poolSvc *service.PoolService
-}
-
-// NewPoolHandler creates a PoolHandler.
-func NewPoolHandler(poolSvc *service.PoolService) *PoolHandler {
-	return &PoolHandler{poolSvc: poolSvc}
-}
-
-// ---------------------------------------------------------------------------
-// Response types
-// ---------------------------------------------------------------------------
-
-type poolJSON struct {
-	ID          string  `json:"id"`
-	Name        string  `json:"name"`
-	Notes       *string `json:"notes"`
-	CreatorID   int16   `json:"creator_id"`
-	CreatorName string  `json:"creator_name"`
-	IsPublic    bool    `json:"is_public"`
-	FileCount   int     `json:"file_count"`
-	CreatedAt   string  `json:"created_at"`
-}
-
-type poolFileJSON struct {
-	fileJSON
-	Position int `json:"position"`
-}
-
-func toPoolJSON(p domain.Pool) poolJSON {
-	return poolJSON{
-		ID:          p.ID.String(),
-		Name:        p.Name,
-		Notes:       p.Notes,
-		CreatorID:   p.CreatorID,
-		CreatorName: p.CreatorName,
-		IsPublic:    p.IsPublic,
-		FileCount:   p.FileCount,
-		CreatedAt:   p.CreatedAt.UTC().Format(time.RFC3339),
-	}
-}
-
-func toPoolFileJSON(pf domain.PoolFile) poolFileJSON {
-	return poolFileJSON{
-		fileJSON: toFileJSON(pf.File),
-		Position: pf.Position,
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Helpers
-// ---------------------------------------------------------------------------
-
-func parsePoolID(c *gin.Context) (uuid.UUID, bool) {
-	id, err := uuid.Parse(c.Param("pool_id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return uuid.UUID{}, false
-	}
-	return id, true
-}
-
-func parsePoolFileParams(c *gin.Context) port.PoolFileListParams {
-	limit := 50
-	if s := c.Query("limit"); s != "" {
-		if n, err := strconv.Atoi(s); err == nil && n > 0 && n <= 200 {
-			limit = n
-		}
-	}
-	return port.PoolFileListParams{
-		Cursor: c.Query("cursor"),
-		Limit:  limit,
-		Filter: c.Query("filter"),
-	}
-}
-
-// ---------------------------------------------------------------------------
-// GET /pools
-// ---------------------------------------------------------------------------
-
-func (h *PoolHandler) List(c *gin.Context) {
-	params := parseOffsetParams(c, "created")
-
-	page, err := h.poolSvc.List(c.Request.Context(), params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]poolJSON, len(page.Items))
-	for i, p := range page.Items {
-		items[i] = toPoolJSON(p)
-	}
-	respondJSON(c, http.StatusOK, gin.H{
-		"items":  items,
-		"total":  page.Total,
-		"offset": page.Offset,
-		"limit":  page.Limit,
-	})
-}
-
-// ---------------------------------------------------------------------------
-// POST /pools
-// ---------------------------------------------------------------------------
-
-func (h *PoolHandler) Create(c *gin.Context) {
-	var body struct {
-		Name     string  `json:"name"      binding:"required"`
-		Notes    *string `json:"notes"`
-		IsPublic *bool   `json:"is_public"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	created, err := h.poolSvc.Create(c.Request.Context(), service.PoolParams{
-		Name:     body.Name,
-		Notes:    body.Notes,
-		IsPublic: body.IsPublic,
-	})
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	respondJSON(c, http.StatusCreated, toPoolJSON(*created))
-}
-
-// ---------------------------------------------------------------------------
-// GET /pools/:pool_id
-// ---------------------------------------------------------------------------
-
-func (h *PoolHandler) Get(c *gin.Context) {
-	id, ok := parsePoolID(c)
-	if !ok {
-		return
-	}
-
-	p, err := h.poolSvc.Get(c.Request.Context(), id)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	respondJSON(c, http.StatusOK, toPoolJSON(*p))
-}
-
-// ---------------------------------------------------------------------------
-// PATCH /pools/:pool_id
-// ---------------------------------------------------------------------------
-
-func (h *PoolHandler) Update(c *gin.Context) {
-	id, ok := parsePoolID(c)
-	if !ok {
-		return
-	}
-
-	var raw map[string]any
-	if err := c.ShouldBindJSON(&raw); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	params := service.PoolParams{}
-	if v, ok := raw["name"]; ok {
-		if s, ok := v.(string); ok {
-			params.Name = s
-		}
-	}
-	if _, ok := raw["notes"]; ok {
-		if raw["notes"] == nil {
-			empty := ""
-			params.Notes = &empty
-		} else if s, ok := raw["notes"].(string); ok {
-			params.Notes = &s
-		}
-	}
-	if v, ok := raw["is_public"]; ok {
-		if b, ok := v.(bool); ok {
-			params.IsPublic = &b
-		}
-	}
-
-	updated, err := h.poolSvc.Update(c.Request.Context(), id, params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	respondJSON(c, http.StatusOK, toPoolJSON(*updated))
-}
-
-// ---------------------------------------------------------------------------
-// DELETE /pools/:pool_id
-// ---------------------------------------------------------------------------
-
-func (h *PoolHandler) Delete(c *gin.Context) {
-	id, ok := parsePoolID(c)
-	if !ok {
-		return
-	}
-
-	if err := h.poolSvc.Delete(c.Request.Context(), id); err != nil {
-		respondError(c, err)
-		return
-	}
-	c.Status(http.StatusNoContent)
-}
-
-// ---------------------------------------------------------------------------
-// GET /pools/:pool_id/files
-// ---------------------------------------------------------------------------
-
-func (h *PoolHandler) ListFiles(c *gin.Context) {
-	poolID, ok := parsePoolID(c)
-	if !ok {
-		return
-	}
-
-	params := parsePoolFileParams(c)
-
-	page, err := h.poolSvc.ListFiles(c.Request.Context(), poolID, params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]poolFileJSON, len(page.Items))
-	for i, pf := range page.Items {
-		items[i] = toPoolFileJSON(pf)
-	}
-	respondJSON(c, http.StatusOK, gin.H{
-		"items":       items,
-		"next_cursor": page.NextCursor,
-	})
-}
-
-// ---------------------------------------------------------------------------
-// POST /pools/:pool_id/files
-// ---------------------------------------------------------------------------
-
-func (h *PoolHandler) AddFiles(c *gin.Context) {
-	poolID, ok := parsePoolID(c)
-	if !ok {
-		return
-	}
-
-	var body struct {
-		FileIDs  []string `json:"file_ids" binding:"required"`
-		Position *int     `json:"position"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	fileIDs := make([]uuid.UUID, 0, len(body.FileIDs))
-	for _, s := range body.FileIDs {
-		id, err := uuid.Parse(s)
-		if err != nil {
-			respondError(c, domain.ErrValidation)
-			return
-		}
-		fileIDs = append(fileIDs, id)
-	}
-
-	if err := h.poolSvc.AddFiles(c.Request.Context(), poolID, fileIDs, body.Position); err != nil {
-		respondError(c, err)
-		return
-	}
-	c.Status(http.StatusCreated)
-}
-
-// ---------------------------------------------------------------------------
-// POST /pools/:pool_id/files/remove
-// ---------------------------------------------------------------------------
-
-func (h *PoolHandler) RemoveFiles(c *gin.Context) {
-	poolID, ok := parsePoolID(c)
-	if !ok {
-		return
-	}
-
-	var body struct {
-		FileIDs []string `json:"file_ids" binding:"required"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	fileIDs := make([]uuid.UUID, 0, len(body.FileIDs))
-	for _, s := range body.FileIDs {
-		id, err := uuid.Parse(s)
-		if err != nil {
-			respondError(c, domain.ErrValidation)
-			return
-		}
-		fileIDs = append(fileIDs, id)
-	}
-
-	if err := h.poolSvc.RemoveFiles(c.Request.Context(), poolID, fileIDs); err != nil {
-		respondError(c, err)
-		return
-	}
-	c.Status(http.StatusNoContent)
-}
-
-// ---------------------------------------------------------------------------
-// PUT /pools/:pool_id/files/reorder
-// ---------------------------------------------------------------------------
-
-func (h *PoolHandler) Reorder(c *gin.Context) {
-	poolID, ok := parsePoolID(c)
-	if !ok {
-		return
-	}
-
-	var body struct {
-		FileIDs []string `json:"file_ids" binding:"required"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	fileIDs := make([]uuid.UUID, 0, len(body.FileIDs))
-	for _, s := range body.FileIDs {
-		id, err := uuid.Parse(s)
-		if err != nil {
-			respondError(c, domain.ErrValidation)
-			return
-		}
-		fileIDs = append(fileIDs, id)
-	}
-
-	if err := h.poolSvc.Reorder(c.Request.Context(), poolID, fileIDs); err != nil {
-		respondError(c, err)
-		return
-	}
-	c.Status(http.StatusNoContent)
-}
--- a/backend/internal/handler/response.go
+++ b/backend/internal/handler/response.go
@ -1,55 +0,0 @@
-package handler
-
-import (
-	"errors"
-	"net/http"
-
-	"github.com/gin-gonic/gin"
-
-	"tanabata/backend/internal/domain"
-)
-
-// errorBody is the JSON shape returned for all error responses.
-type errorBody struct {
-	Code    string `json:"code"`
-	Message string `json:"message"`
-}
-
-func respondJSON(c *gin.Context, status int, data any) {
-	c.JSON(status, data)
-}
-
-// respondError maps a domain error to the appropriate HTTP status and writes
-// a JSON error body. Unknown errors become 500.
-func respondError(c *gin.Context, err error) {
-	var de *domain.DomainError
-	if errors.As(err, &de) {
-		c.JSON(domainStatus(de), errorBody{Code: de.Code(), Message: de.Error()})
-		return
-	}
-	c.JSON(http.StatusInternalServerError, errorBody{
-		Code:    "internal_error",
-		Message: "internal server error",
-	})
-}
-
-// domainStatus maps a DomainError sentinel to its HTTP status code per the
-// error mapping table in docs/GO_PROJECT_STRUCTURE.md.
-func domainStatus(de *domain.DomainError) int {
-	switch de {
-	case domain.ErrNotFound:
-		return http.StatusNotFound
-	case domain.ErrForbidden:
-		return http.StatusForbidden
-	case domain.ErrUnauthorized:
-		return http.StatusUnauthorized
-	case domain.ErrConflict:
-		return http.StatusConflict
-	case domain.ErrValidation:
-		return http.StatusBadRequest
-	case domain.ErrUnsupportedMIME:
-		return http.StatusUnsupportedMediaType
-	default:
-		return http.StatusInternalServerError
-	}
-}
--- a/backend/internal/handler/router.go
+++ b/backend/internal/handler/router.go
@ -1,167 +0,0 @@
-package handler
-
-import (
-	"net/http"
-
-	"github.com/gin-gonic/gin"
-)
-
-// NewRouter builds and returns a configured Gin engine.
-func NewRouter(
-	auth *AuthMiddleware,
-	authHandler *AuthHandler,
-	fileHandler *FileHandler,
-	tagHandler *TagHandler,
-	categoryHandler *CategoryHandler,
-	poolHandler *PoolHandler,
-	userHandler *UserHandler,
-	aclHandler *ACLHandler,
-	auditHandler *AuditHandler,
-) *gin.Engine {
-	r := gin.New()
-	r.Use(gin.Logger(), gin.Recovery())
-
-	// Health check — no auth required.
-	r.GET("/health", func(c *gin.Context) {
-		c.JSON(http.StatusOK, gin.H{"status": "ok"})
-	})
-
-	v1 := r.Group("/api/v1")
-
-	// -------------------------------------------------------------------------
-	// Auth
-	// -------------------------------------------------------------------------
-	authGroup := v1.Group("/auth")
-	{
-		authGroup.POST("/login", authHandler.Login)
-		authGroup.POST("/refresh", authHandler.Refresh)
-
-		protected := authGroup.Group("", auth.Handle())
-		{
-			protected.POST("/logout", authHandler.Logout)
-			protected.GET("/sessions", authHandler.ListSessions)
-			protected.DELETE("/sessions/:id", authHandler.TerminateSession)
-		}
-	}
-
-	// -------------------------------------------------------------------------
-	// Files (all require auth)
-	// -------------------------------------------------------------------------
-	files := v1.Group("/files", auth.Handle())
-	{
-		files.GET("", fileHandler.List)
-		files.POST("", fileHandler.Upload)
-
-		// Bulk + import routes registered before /:id to prevent param collision.
-		files.POST("/bulk/tags", fileHandler.BulkSetTags)
-		files.POST("/bulk/delete", fileHandler.BulkDelete)
-		files.POST("/bulk/common-tags", fileHandler.CommonTags)
-		files.POST("/import", fileHandler.Import)
-
-		// Per-file routes.
-		files.GET("/:id", fileHandler.GetMeta)
-		files.PATCH("/:id", fileHandler.UpdateMeta)
-		files.DELETE("/:id", fileHandler.SoftDelete)
-
-		files.GET("/:id/content", fileHandler.GetContent)
-		files.PUT("/:id/content", fileHandler.ReplaceContent)
-		files.GET("/:id/thumbnail", fileHandler.GetThumbnail)
-		files.GET("/:id/preview", fileHandler.GetPreview)
-		files.POST("/:id/restore", fileHandler.Restore)
-		files.DELETE("/:id/permanent", fileHandler.PermanentDelete)
-
-		// File–tag relations — served by TagHandler for auto-rule support.
-		files.GET("/:id/tags", tagHandler.FileListTags)
-		files.PUT("/:id/tags", tagHandler.FileSetTags)
-		files.PUT("/:id/tags/:tag_id", tagHandler.FileAddTag)
-		files.DELETE("/:id/tags/:tag_id", tagHandler.FileRemoveTag)
-	}
-
-	// -------------------------------------------------------------------------
-	// Tags (all require auth)
-	// -------------------------------------------------------------------------
-	tags := v1.Group("/tags", auth.Handle())
-	{
-		tags.GET("", tagHandler.List)
-		tags.POST("", tagHandler.Create)
-
-		tags.GET("/:tag_id", tagHandler.Get)
-		tags.PATCH("/:tag_id", tagHandler.Update)
-		tags.DELETE("/:tag_id", tagHandler.Delete)
-
-		tags.GET("/:tag_id/files", tagHandler.ListFiles)
-
-		tags.GET("/:tag_id/rules", tagHandler.ListRules)
-		tags.POST("/:tag_id/rules", tagHandler.CreateRule)
-		tags.PATCH("/:tag_id/rules/:then_tag_id", tagHandler.PatchRule)
-		tags.DELETE("/:tag_id/rules/:then_tag_id", tagHandler.DeleteRule)
-	}
-
-	// -------------------------------------------------------------------------
-	// Categories (all require auth)
-	// -------------------------------------------------------------------------
-	categories := v1.Group("/categories", auth.Handle())
-	{
-		categories.GET("", categoryHandler.List)
-		categories.POST("", categoryHandler.Create)
-
-		categories.GET("/:category_id", categoryHandler.Get)
-		categories.PATCH("/:category_id", categoryHandler.Update)
-		categories.DELETE("/:category_id", categoryHandler.Delete)
-
-		categories.GET("/:category_id/tags", categoryHandler.ListTags)
-	}
-
-	// -------------------------------------------------------------------------
-	// Pools (all require auth)
-	// -------------------------------------------------------------------------
-	pools := v1.Group("/pools", auth.Handle())
-	{
-		pools.GET("", poolHandler.List)
-		pools.POST("", poolHandler.Create)
-
-		pools.GET("/:pool_id", poolHandler.Get)
-		pools.PATCH("/:pool_id", poolHandler.Update)
-		pools.DELETE("/:pool_id", poolHandler.Delete)
-
-		// Sub-routes registered before /:pool_id/files to avoid param conflicts.
-		pools.POST("/:pool_id/files/remove", poolHandler.RemoveFiles)
-		pools.PUT("/:pool_id/files/reorder", poolHandler.Reorder)
-
-		pools.GET("/:pool_id/files", poolHandler.ListFiles)
-		pools.POST("/:pool_id/files", poolHandler.AddFiles)
-	}
-
-	// -------------------------------------------------------------------------
-	// Users (auth required; admin checks enforced in handler)
-	// -------------------------------------------------------------------------
-	users := v1.Group("/users", auth.Handle())
-	{
-		// /users/me must be registered before /:user_id to avoid param capture.
-		users.GET("/me", userHandler.GetMe)
-		users.PATCH("/me", userHandler.UpdateMe)
-
-		users.GET("", userHandler.List)
-		users.POST("", userHandler.Create)
-
-		users.GET("/:user_id", userHandler.Get)
-		users.PATCH("/:user_id", userHandler.UpdateAdmin)
-		users.DELETE("/:user_id", userHandler.Delete)
-	}
-
-	// -------------------------------------------------------------------------
-	// ACL (auth required)
-	// -------------------------------------------------------------------------
-	acl := v1.Group("/acl", auth.Handle())
-	{
-		acl.GET("/:object_type/:object_id", aclHandler.GetPermissions)
-		acl.PUT("/:object_type/:object_id", aclHandler.SetPermissions)
-	}
-
-	// -------------------------------------------------------------------------
-	// Audit (auth required; admin check enforced in handler)
-	// -------------------------------------------------------------------------
-	v1.GET("/audit", auth.Handle(), auditHandler.List)
-
-	return r
-}
--- a/backend/internal/handler/tag_handler.go
+++ b/backend/internal/handler/tag_handler.go
@ -1,532 +0,0 @@
-package handler
-
-import (
-	"net/http"
-	"strconv"
-
-	"github.com/gin-gonic/gin"
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-	"tanabata/backend/internal/service"
-)
-
-// TagHandler handles all /tags endpoints.
-type TagHandler struct {
-	tagSvc  *service.TagService
-	fileSvc *service.FileService
-}
-
-// NewTagHandler creates a TagHandler.
-func NewTagHandler(tagSvc *service.TagService, fileSvc *service.FileService) *TagHandler {
-	return &TagHandler{tagSvc: tagSvc, fileSvc: fileSvc}
-}
-
-// ---------------------------------------------------------------------------
-// Response types
-// ---------------------------------------------------------------------------
-
-type tagRuleJSON struct {
-	WhenTagID   string `json:"when_tag_id"`
-	ThenTagID   string `json:"then_tag_id"`
-	ThenTagName string `json:"then_tag_name"`
-	IsActive    bool   `json:"is_active"`
-}
-
-func toTagRuleJSON(r domain.TagRule) tagRuleJSON {
-	return tagRuleJSON{
-		WhenTagID:   r.WhenTagID.String(),
-		ThenTagID:   r.ThenTagID.String(),
-		ThenTagName: r.ThenTagName,
-		IsActive:    r.IsActive,
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Helpers
-// ---------------------------------------------------------------------------
-
-func parseTagID(c *gin.Context) (uuid.UUID, bool) {
-	id, err := uuid.Parse(c.Param("tag_id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return uuid.UUID{}, false
-	}
-	return id, true
-}
-
-func parseOffsetParams(c *gin.Context, defaultSort string) port.OffsetParams {
-	limit := 50
-	if s := c.Query("limit"); s != "" {
-		if n, err := strconv.Atoi(s); err == nil && n > 0 && n <= 200 {
-			limit = n
-		}
-	}
-	offset := 0
-	if s := c.Query("offset"); s != "" {
-		if n, err := strconv.Atoi(s); err == nil && n >= 0 {
-			offset = n
-		}
-	}
-	sort := c.DefaultQuery("sort", defaultSort)
-	order := c.DefaultQuery("order", "desc")
-	search := c.Query("search")
-	return port.OffsetParams{Sort: sort, Order: order, Search: search, Limit: limit, Offset: offset}
-}
-
-// ---------------------------------------------------------------------------
-// GET /tags
-// ---------------------------------------------------------------------------
-
-func (h *TagHandler) List(c *gin.Context) {
-	params := parseOffsetParams(c, "created")
-
-	page, err := h.tagSvc.List(c.Request.Context(), params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]tagJSON, len(page.Items))
-	for i, t := range page.Items {
-		items[i] = toTagJSON(t)
-	}
-	respondJSON(c, http.StatusOK, gin.H{
-		"items":  items,
-		"total":  page.Total,
-		"offset": page.Offset,
-		"limit":  page.Limit,
-	})
-}
-
-// ---------------------------------------------------------------------------
-// POST /tags
-// ---------------------------------------------------------------------------
-
-func (h *TagHandler) Create(c *gin.Context) {
-	var body struct {
-		Name       string   `json:"name"       binding:"required"`
-		Notes      *string  `json:"notes"`
-		Color      *string  `json:"color"`
-		CategoryID *string  `json:"category_id"`
-		IsPublic   *bool    `json:"is_public"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	params := service.TagParams{
-		Name:     body.Name,
-		Notes:    body.Notes,
-		Color:    body.Color,
-		IsPublic: body.IsPublic,
-	}
-	if body.CategoryID != nil {
-		id, err := uuid.Parse(*body.CategoryID)
-		if err != nil {
-			respondError(c, domain.ErrValidation)
-			return
-		}
-		params.CategoryID = &id
-	}
-
-	t, err := h.tagSvc.Create(c.Request.Context(), params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusCreated, toTagJSON(*t))
-}
-
-// ---------------------------------------------------------------------------
-// GET /tags/:tag_id
-// ---------------------------------------------------------------------------
-
-func (h *TagHandler) Get(c *gin.Context) {
-	id, ok := parseTagID(c)
-	if !ok {
-		return
-	}
-
-	t, err := h.tagSvc.Get(c.Request.Context(), id)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusOK, toTagJSON(*t))
-}
-
-// ---------------------------------------------------------------------------
-// PATCH /tags/:tag_id
-// ---------------------------------------------------------------------------
-
-func (h *TagHandler) Update(c *gin.Context) {
-	id, ok := parseTagID(c)
-	if !ok {
-		return
-	}
-
-	// Use a raw map to distinguish "field absent" from "field = null".
-	var raw map[string]any
-	if err := c.ShouldBindJSON(&raw); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	params := service.TagParams{}
-
-	if v, ok := raw["name"]; ok {
-		if s, ok := v.(string); ok {
-			params.Name = s
-		}
-	}
-	if _, ok := raw["notes"]; ok {
-		if raw["notes"] == nil {
-			params.Notes = ptr("")
-		} else if s, ok := raw["notes"].(string); ok {
-			params.Notes = &s
-		}
-	}
-	if _, ok := raw["color"]; ok {
-		if raw["color"] == nil {
-			nilStr := ""
-			params.Color = &nilStr
-		} else if s, ok := raw["color"].(string); ok {
-			params.Color = &s
-		}
-	}
-	if _, ok := raw["category_id"]; ok {
-		if raw["category_id"] == nil {
-			nilID := uuid.Nil
-			params.CategoryID = &nilID // signals "unassign"
-		} else if s, ok := raw["category_id"].(string); ok {
-			cid, err := uuid.Parse(s)
-			if err != nil {
-				respondError(c, domain.ErrValidation)
-				return
-			}
-			params.CategoryID = &cid
-		}
-	}
-	if v, ok := raw["is_public"]; ok {
-		if b, ok := v.(bool); ok {
-			params.IsPublic = &b
-		}
-	}
-
-	t, err := h.tagSvc.Update(c.Request.Context(), id, params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusOK, toTagJSON(*t))
-}
-
-// ---------------------------------------------------------------------------
-// DELETE /tags/:tag_id
-// ---------------------------------------------------------------------------
-
-func (h *TagHandler) Delete(c *gin.Context) {
-	id, ok := parseTagID(c)
-	if !ok {
-		return
-	}
-
-	if err := h.tagSvc.Delete(c.Request.Context(), id); err != nil {
-		respondError(c, err)
-		return
-	}
-
-	c.Status(http.StatusNoContent)
-}
-
-// ---------------------------------------------------------------------------
-// GET /tags/:tag_id/files
-// ---------------------------------------------------------------------------
-
-func (h *TagHandler) ListFiles(c *gin.Context) {
-	id, ok := parseTagID(c)
-	if !ok {
-		return
-	}
-
-	limit := 50
-	if s := c.Query("limit"); s != "" {
-		if n, err := strconv.Atoi(s); err == nil && n > 0 && n <= 200 {
-			limit = n
-		}
-	}
-
-	// Delegate to file service with a tag filter.
-	page, err := h.fileSvc.List(c.Request.Context(), domain.FileListParams{
-		Cursor:    c.Query("cursor"),
-		Direction: "forward",
-		Limit:     limit,
-		Sort:      "created",
-		Order:     "desc",
-		Filter:    "{t=" + id.String() + "}",
-	})
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]fileJSON, len(page.Items))
-	for i, f := range page.Items {
-		items[i] = toFileJSON(f)
-	}
-	respondJSON(c, http.StatusOK, gin.H{
-		"items":       items,
-		"next_cursor": page.NextCursor,
-		"prev_cursor": page.PrevCursor,
-	})
-}
-
-// ---------------------------------------------------------------------------
-// GET /tags/:tag_id/rules
-// ---------------------------------------------------------------------------
-
-func (h *TagHandler) ListRules(c *gin.Context) {
-	id, ok := parseTagID(c)
-	if !ok {
-		return
-	}
-
-	rules, err := h.tagSvc.ListRules(c.Request.Context(), id)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]tagRuleJSON, len(rules))
-	for i, r := range rules {
-		items[i] = toTagRuleJSON(r)
-	}
-	respondJSON(c, http.StatusOK, items)
-}
-
-// ---------------------------------------------------------------------------
-// POST /tags/:tag_id/rules
-// ---------------------------------------------------------------------------
-
-func (h *TagHandler) CreateRule(c *gin.Context) {
-	whenTagID, ok := parseTagID(c)
-	if !ok {
-		return
-	}
-
-	var body struct {
-		ThenTagID       string `json:"then_tag_id" binding:"required"`
-		IsActive        *bool  `json:"is_active"`
-		ApplyToExisting *bool  `json:"apply_to_existing"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	thenTagID, err := uuid.Parse(body.ThenTagID)
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	isActive := true
-	if body.IsActive != nil {
-		isActive = *body.IsActive
-	}
-	applyToExisting := true
-	if body.ApplyToExisting != nil {
-		applyToExisting = *body.ApplyToExisting
-	}
-
-	rule, err := h.tagSvc.CreateRule(c.Request.Context(), whenTagID, thenTagID, isActive, applyToExisting)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusCreated, toTagRuleJSON(*rule))
-}
-
-// ---------------------------------------------------------------------------
-// PATCH /tags/:tag_id/rules/:then_tag_id
-// ---------------------------------------------------------------------------
-
-func (h *TagHandler) PatchRule(c *gin.Context) {
-	whenTagID, ok := parseTagID(c)
-	if !ok {
-		return
-	}
-
-	thenTagID, err := uuid.Parse(c.Param("then_tag_id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	var body struct {
-		IsActive        *bool `json:"is_active"`
-		ApplyToExisting *bool `json:"apply_to_existing"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil || body.IsActive == nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	applyToExisting := false
-	if body.ApplyToExisting != nil {
-		applyToExisting = *body.ApplyToExisting
-	}
-
-	rule, err := h.tagSvc.SetRuleActive(c.Request.Context(), whenTagID, thenTagID, *body.IsActive, applyToExisting)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	respondJSON(c, http.StatusOK, toTagRuleJSON(*rule))
-}
-
-// ---------------------------------------------------------------------------
-// DELETE /tags/:tag_id/rules/:then_tag_id
-// ---------------------------------------------------------------------------
-
-func (h *TagHandler) DeleteRule(c *gin.Context) {
-	whenTagID, ok := parseTagID(c)
-	if !ok {
-		return
-	}
-
-	thenTagID, err := uuid.Parse(c.Param("then_tag_id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	if err := h.tagSvc.DeleteRule(c.Request.Context(), whenTagID, thenTagID); err != nil {
-		respondError(c, err)
-		return
-	}
-
-	c.Status(http.StatusNoContent)
-}
-
-// ---------------------------------------------------------------------------
-// File-tag endpoints wired through TagService
-// (called from file routes, shared handler logic lives here)
-// ---------------------------------------------------------------------------
-
-// FileListTags handles GET /files/:id/tags.
-func (h *TagHandler) FileListTags(c *gin.Context) {
-	fileID, err := uuid.Parse(c.Param("id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	tags, err := h.tagSvc.ListFileTags(c.Request.Context(), fileID)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]tagJSON, len(tags))
-	for i, t := range tags {
-		items[i] = toTagJSON(t)
-	}
-	respondJSON(c, http.StatusOK, items)
-}
-
-// FileSetTags handles PUT /files/:id/tags.
-func (h *TagHandler) FileSetTags(c *gin.Context) {
-	fileID, err := uuid.Parse(c.Param("id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	var body struct {
-		TagIDs []string `json:"tag_ids" binding:"required"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	tagIDs, err := parseUUIDs(body.TagIDs)
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	tags, err := h.tagSvc.SetFileTags(c.Request.Context(), fileID, tagIDs)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]tagJSON, len(tags))
-	for i, t := range tags {
-		items[i] = toTagJSON(t)
-	}
-	respondJSON(c, http.StatusOK, items)
-}
-
-// FileAddTag handles PUT /files/:id/tags/:tag_id.
-func (h *TagHandler) FileAddTag(c *gin.Context) {
-	fileID, err := uuid.Parse(c.Param("id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-	tagID, err := uuid.Parse(c.Param("tag_id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	tags, err := h.tagSvc.AddFileTag(c.Request.Context(), fileID, tagID)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]tagJSON, len(tags))
-	for i, t := range tags {
-		items[i] = toTagJSON(t)
-	}
-	respondJSON(c, http.StatusOK, items)
-}
-
-// FileRemoveTag handles DELETE /files/:id/tags/:tag_id.
-func (h *TagHandler) FileRemoveTag(c *gin.Context) {
-	fileID, err := uuid.Parse(c.Param("id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-	tagID, err := uuid.Parse(c.Param("tag_id"))
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	if err := h.tagSvc.RemoveFileTag(c.Request.Context(), fileID, tagID); err != nil {
-		respondError(c, err)
-		return
-	}
-
-	c.Status(http.StatusNoContent)
-}
-
-// ---------------------------------------------------------------------------
-// Helpers
-// ---------------------------------------------------------------------------
-
-func ptr(s string) *string { return &s }
--- a/backend/internal/handler/user_handler.go
+++ b/backend/internal/handler/user_handler.go
@ -1,258 +0,0 @@
-package handler
-
-import (
-	"net/http"
-	"strconv"
-
-	"github.com/gin-gonic/gin"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-	"tanabata/backend/internal/service"
-)
-
-// UserHandler handles all /users endpoints.
-type UserHandler struct {
-	userSvc *service.UserService
-}
-
-// NewUserHandler creates a UserHandler.
-func NewUserHandler(userSvc *service.UserService) *UserHandler {
-	return &UserHandler{userSvc: userSvc}
-}
-
-// ---------------------------------------------------------------------------
-// Response types
-// ---------------------------------------------------------------------------
-
-type userJSON struct {
-	ID        int16  `json:"id"`
-	Name      string `json:"name"`
-	IsAdmin   bool   `json:"is_admin"`
-	CanCreate bool   `json:"can_create"`
-	IsBlocked bool   `json:"is_blocked"`
-}
-
-func toUserJSON(u domain.User) userJSON {
-	return userJSON{
-		ID:        u.ID,
-		Name:      u.Name,
-		IsAdmin:   u.IsAdmin,
-		CanCreate: u.CanCreate,
-		IsBlocked: u.IsBlocked,
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Helpers
-// ---------------------------------------------------------------------------
-
-func requireAdmin(c *gin.Context) bool {
-	_, isAdmin, _ := domain.UserFromContext(c.Request.Context())
-	if !isAdmin {
-		respondError(c, domain.ErrForbidden)
-		return false
-	}
-	return true
-}
-
-func parseUserID(c *gin.Context) (int16, bool) {
-	n, err := strconv.ParseInt(c.Param("user_id"), 10, 16)
-	if err != nil {
-		respondError(c, domain.ErrValidation)
-		return 0, false
-	}
-	return int16(n), true
-}
-
-// ---------------------------------------------------------------------------
-// GET /users/me
-// ---------------------------------------------------------------------------
-
-func (h *UserHandler) GetMe(c *gin.Context) {
-	u, err := h.userSvc.GetMe(c.Request.Context())
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	respondJSON(c, http.StatusOK, toUserJSON(*u))
-}
-
-// ---------------------------------------------------------------------------
-// PATCH /users/me
-// ---------------------------------------------------------------------------
-
-func (h *UserHandler) UpdateMe(c *gin.Context) {
-	var body struct {
-		Name     string  `json:"name"`
-		Password *string `json:"password"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	updated, err := h.userSvc.UpdateMe(c.Request.Context(), service.UpdateMeParams{
-		Name:     body.Name,
-		Password: body.Password,
-	})
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	respondJSON(c, http.StatusOK, toUserJSON(*updated))
-}
-
-// ---------------------------------------------------------------------------
-// GET /users  (admin)
-// ---------------------------------------------------------------------------
-
-func (h *UserHandler) List(c *gin.Context) {
-	if !requireAdmin(c) {
-		return
-	}
-
-	params := port.OffsetParams{
-		Sort:  c.DefaultQuery("sort", "id"),
-		Order: c.DefaultQuery("order", "asc"),
-	}
-	if s := c.Query("limit"); s != "" {
-		if n, err := strconv.Atoi(s); err == nil {
-			params.Limit = n
-		}
-	}
-	if s := c.Query("offset"); s != "" {
-		if n, err := strconv.Atoi(s); err == nil {
-			params.Offset = n
-		}
-	}
-
-	page, err := h.userSvc.List(c.Request.Context(), params)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-
-	items := make([]userJSON, len(page.Items))
-	for i, u := range page.Items {
-		items[i] = toUserJSON(u)
-	}
-	respondJSON(c, http.StatusOK, gin.H{
-		"items":  items,
-		"total":  page.Total,
-		"offset": page.Offset,
-		"limit":  page.Limit,
-	})
-}
-
-// ---------------------------------------------------------------------------
-// POST /users  (admin)
-// ---------------------------------------------------------------------------
-
-func (h *UserHandler) Create(c *gin.Context) {
-	if !requireAdmin(c) {
-		return
-	}
-
-	var body struct {
-		Name      string `json:"name"     binding:"required"`
-		Password  string `json:"password" binding:"required"`
-		IsAdmin   bool   `json:"is_admin"`
-		CanCreate bool   `json:"can_create"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	created, err := h.userSvc.Create(c.Request.Context(), service.CreateUserParams{
-		Name:      body.Name,
-		Password:  body.Password,
-		IsAdmin:   body.IsAdmin,
-		CanCreate: body.CanCreate,
-	})
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	respondJSON(c, http.StatusCreated, toUserJSON(*created))
-}
-
-// ---------------------------------------------------------------------------
-// GET /users/:user_id  (admin)
-// ---------------------------------------------------------------------------
-
-func (h *UserHandler) Get(c *gin.Context) {
-	if !requireAdmin(c) {
-		return
-	}
-
-	id, ok := parseUserID(c)
-	if !ok {
-		return
-	}
-
-	u, err := h.userSvc.Get(c.Request.Context(), id)
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	respondJSON(c, http.StatusOK, toUserJSON(*u))
-}
-
-// ---------------------------------------------------------------------------
-// PATCH /users/:user_id  (admin)
-// ---------------------------------------------------------------------------
-
-func (h *UserHandler) UpdateAdmin(c *gin.Context) {
-	if !requireAdmin(c) {
-		return
-	}
-
-	id, ok := parseUserID(c)
-	if !ok {
-		return
-	}
-
-	var body struct {
-		IsAdmin   *bool `json:"is_admin"`
-		CanCreate *bool `json:"can_create"`
-		IsBlocked *bool `json:"is_blocked"`
-	}
-	if err := c.ShouldBindJSON(&body); err != nil {
-		respondError(c, domain.ErrValidation)
-		return
-	}
-
-	updated, err := h.userSvc.UpdateAdmin(c.Request.Context(), id, service.UpdateAdminParams{
-		IsAdmin:   body.IsAdmin,
-		CanCreate: body.CanCreate,
-		IsBlocked: body.IsBlocked,
-	})
-	if err != nil {
-		respondError(c, err)
-		return
-	}
-	respondJSON(c, http.StatusOK, toUserJSON(*updated))
-}
-
-// ---------------------------------------------------------------------------
-// DELETE /users/:user_id  (admin)
-// ---------------------------------------------------------------------------
-
-func (h *UserHandler) Delete(c *gin.Context) {
-	if !requireAdmin(c) {
-		return
-	}
-
-	id, ok := parseUserID(c)
-	if !ok {
-		return
-	}
-
-	if err := h.userSvc.Delete(c.Request.Context(), id); err != nil {
-		respondError(c, err)
-		return
-	}
-	c.Status(http.StatusNoContent)
-}
--- a/backend/internal/infrastructure/persistence/postgres/db.go
+++ b/backend/internal/infrastructure/persistence/postgres/db.go
@ -0,0 +1,54 @@
+package postgres
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"tanabata/internal/domain"
+)
+
+// Initialize PostgreSQL database driver
+func New(dbURL string) (*pgxpool.Pool, error) {
+	poolConfig, err := pgxpool.ParseConfig(dbURL)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse connection string: %w", err)
+	}
+
+	poolConfig.MaxConns = 100
+	poolConfig.MinConns = 0
+	poolConfig.MaxConnLifetime = time.Hour
+	poolConfig.HealthCheckPeriod = 30 * time.Second
+
+	ctx := context.Background()
+	db, err := pgxpool.NewWithConfig(ctx, poolConfig)
+	if err != nil {
+		return nil, fmt.Errorf("failed to initialize DB connections pool: %w", err)
+	}
+	if err = db.Ping(ctx); err != nil {
+		return nil, fmt.Errorf("failed to ping database: %w", err)
+	}
+	return db, nil
+}
+
+// Transaction wrapper
+func transaction(ctx context.Context, db *pgxpool.Pool, handler func(context.Context, pgx.Tx) *domain.DomainError) (domainErr *domain.DomainError) {
+	tx, err := db.Begin(ctx)
+	if err != nil {
+		domainErr = domain.NewErrorUnexpected().Wrap(err)
+		return
+	}
+	domainErr = handler(ctx, tx)
+	if domainErr != nil {
+		tx.Rollback(ctx)
+		return
+	}
+	err = tx.Commit(ctx)
+	if err != nil {
+		domainErr = domain.NewErrorUnexpected().Wrap(err)
+	}
+	return
+}
--- a/backend/internal/infrastructure/persistence/postgres/file_repository.go
+++ b/backend/internal/infrastructure/persistence/postgres/file_repository.go
@ -0,0 +1,331 @@
+package postgres
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"tanabata/internal/domain"
+)
+
+type FileRepository struct {
+	db *pgxpool.Pool
+}
+
+func NewFileRepository(db *pgxpool.Pool) *FileRepository {
+	return &FileRepository{db: db}
+}
+
+// Get user permissions on file
+func (s *FileRepository) GetAccess(ctx context.Context, user_id int, file_id string) (canView, canEdit bool, domainErr *domain.DomainError) {
+	row := s.db.QueryRow(ctx, `
+		SELECT 
+			COALESCE(a.view, FALSE) OR f.creator_id=$1 OR COALESCE(u.is_admin, FALSE),
+			COALESCE(a.edit, FALSE) OR f.creator_id=$1 OR COALESCE(u.is_admin, FALSE)
+		FROM data.files f
+		LEFT JOIN acl.files a ON a.file_id=f.id AND a.user_id=$1
+		LEFT JOIN system.users u ON u.id=$1
+		WHERE f.id=$2
+		`, user_id, file_id)
+	err := row.Scan(&canView, &canEdit)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			domainErr = domain.NewErrorFileNotFound(file_id).Wrap(err)
+			return
+		}
+		var pgErr *pgconn.PgError
+		if errors.As(err, &pgErr) {
+			switch pgErr.Code {
+			case "22P02":
+				domainErr = domain.NewErrorBadRequest(fmt.Sprintf("Invalid file id: %q", file_id)).Wrap(err)
+				return
+			}
+		}
+		domainErr = domain.NewErrorUnexpected().Wrap(err)
+	}
+	return
+}
+
+// Get a set of files
+func (s *FileRepository) GetSlice(ctx context.Context, user_id int, filter, sort string, limit, offset int) (files domain.Slice[domain.FileItem], domainErr *domain.DomainError) {
+	filterCond, err := filterToSQL(filter)
+	if err != nil {
+		domainErr = domain.NewErrorBadRequest(fmt.Sprintf("Invalid filter string: %q", filter)).Wrap(err)
+		return
+	}
+	sortExpr, err := sortToSQL(sort)
+	if err != nil {
+		domainErr = domain.NewErrorBadRequest(fmt.Sprintf("Invalid sorting parameter: %q", sort)).Wrap(err)
+		return
+	}
+	// prepare query
+	query := `
+		SELECT
+			f.id,
+			f.name,
+			m.name,
+			m.extension,
+			uuid_extract_timestamp(f.id),
+			u.name,
+			u.is_admin
+		FROM data.files f
+		JOIN system.mime m ON m.id=f.mime_id
+		JOIN system.users u ON u.id=f.creator_id
+		WHERE f.is_deleted IS FALSE AND (f.creator_id=$1 OR (SELECT view FROM acl.files WHERE file_id=f.id AND user_id=$1) OR (SELECT is_admin FROM system.users WHERE id=$1)) AND
+	`
+	query += filterCond
+	queryCount := query
+	query += sortExpr
+	if limit >= 0 {
+		query += fmt.Sprintf(" LIMIT %d", limit)
+	}
+	if offset > 0 {
+		query += fmt.Sprintf(" OFFSET %d", offset)
+	}
+	// execute query
+	domainErr = transaction(ctx, s.db, func(ctx context.Context, tx pgx.Tx) (domainErr *domain.DomainError) {
+		rows, err := tx.Query(ctx, query, user_id)
+		if err != nil && !errors.Is(err, pgx.ErrNoRows) {
+			var pgErr *pgconn.PgError
+			if errors.As(err, &pgErr) {
+				switch pgErr.Code {
+				case "42P10":
+					domainErr = domain.NewErrorBadRequest(fmt.Sprintf("Invalid sorting field: %q", sort[1:])).Wrap(err)
+					return
+				}
+			}
+			domainErr = domain.NewErrorUnexpected().Wrap(err)
+			return
+		}
+		defer rows.Close()
+		count := 0
+		for rows.Next() {
+			var file domain.FileItem
+			err = rows.Scan(&file.ID, &file.Name, &file.MIME.Name, &file.MIME.Extension, &file.CreatedAt, &file.Creator.Name, &file.Creator.IsAdmin)
+			if err != nil {
+				domainErr = domain.NewErrorUnexpected().Wrap(err)
+				return
+			}
+			files.Data = append(files.Data, file)
+			count++
+		}
+		err = rows.Err()
+		if err != nil {
+			domainErr = domain.NewErrorUnexpected().Wrap(err)
+			return
+		}
+		files.Pagination.Limit = limit
+		files.Pagination.Offset = offset
+		files.Pagination.Count = count
+		row := tx.QueryRow(ctx, fmt.Sprintf("SELECT COUNT(*) FROM (%s) tmp", queryCount), user_id)
+		err = row.Scan(&files.Pagination.Total)
+		if err != nil {
+			domainErr = domain.NewErrorUnexpected().Wrap(err)
+		}
+		return
+	})
+	return
+}
+
+// Get file
+func (s *FileRepository) Get(ctx context.Context, user_id int, file_id string) (file domain.FileFull, domainErr *domain.DomainError) {
+	row := s.db.QueryRow(ctx, `
+		SELECT
+			f.id,
+			f.name,
+			m.name,
+			m.extension,
+			uuid_extract_timestamp(f.id),
+			u.name,
+			u.is_admin,
+			f.notes,
+			f.metadata,
+			(SELECT COUNT(*) FROM activity.file_views fv WHERE fv.file_id=$2 AND fv.user_id=$1)
+		FROM data.files f
+		JOIN system.mime m ON m.id=f.mime_id
+		JOIN system.users u ON u.id=f.creator_id
+		WHERE f.is_deleted IS FALSE
+		`, user_id, file_id)
+	err := row.Scan(&file.ID, &file.Name, &file.MIME.Name, &file.MIME.Extension, &file.CreatedAt, &file.Creator.Name, &file.Creator.IsAdmin, &file.Notes, &file.Metadata, &file.Viewed)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			domainErr = domain.NewErrorFileNotFound(file_id).Wrap(err)
+			return
+		}
+		var pgErr *pgconn.PgError
+		if errors.As(err, &pgErr) {
+			switch pgErr.Code {
+			case "22P02":
+				domainErr = domain.NewErrorBadRequest(fmt.Sprintf("Invalid file id: %q", file_id)).Wrap(err)
+				return
+			}
+		}
+		domainErr = domain.NewErrorUnexpected().Wrap(err)
+		return
+	}
+	return
+}
+
+// Add file
+func (s *FileRepository) Add(ctx context.Context, user_id int, name, mime string, datetime time.Time, notes string, metadata json.RawMessage) (file domain.FileCore, domainErr *domain.DomainError) {
+	var mime_id int
+	var extension string
+	row := s.db.QueryRow(ctx, "SELECT id, extension FROM system.mime WHERE name=$1", mime)
+	err := row.Scan(&mime_id, &extension)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			domainErr = domain.NewErrorMIMENotSupported(mime).Wrap(err)
+			return
+		}
+		domainErr = domain.NewErrorUnexpected().Wrap(err)
+		return
+	}
+	row = s.db.QueryRow(ctx, `
+		INSERT INTO data.files (name, mime_id, datetime, creator_id, notes, metadata)
+		VALUES (NULLIF($1, ''), $2, $3, $4, NULLIF($5 ,''), $6)
+		RETURNING id
+		`, name, mime_id, datetime, user_id, notes, metadata)
+	err = row.Scan(&file.ID)
+	if err != nil {
+		var pgErr *pgconn.PgError
+		if errors.As(err, &pgErr) {
+			switch pgErr.Code {
+			case "22007":
+				domainErr = domain.NewErrorBadRequest(fmt.Sprintf("Invalid datetime: %q", datetime)).Wrap(err)
+				return
+			case "23502":
+				domainErr = domain.NewErrorBadRequest("Unable to set NULL to some fields").Wrap(err)
+				return
+			}
+		}
+		domainErr = domain.NewErrorUnexpected().Wrap(err)
+		return
+	}
+	file.Name = &name
+	file.MIME.Name = mime
+	file.MIME.Extension = extension
+	return
+}
+
+// Update file
+func (s *FileRepository) Update(ctx context.Context, file_id string, updates map[string]interface{}) (domainErr *domain.DomainError) {
+	if len(updates) == 0 {
+		// domainErr = domain.NewErrorBadRequest(nil, "No fields provided for update")
+		return
+	}
+	query := "UPDATE data.files SET"
+	newValues := []interface{}{file_id}
+	count := 2
+	for field, value := range updates {
+		switch field {
+		case "name", "notes":
+			query += fmt.Sprintf(" %s=NULLIF($%d, '')", field, count)
+		case "datetime":
+			query += fmt.Sprintf(" %s=NULLIF($%d, '')::timestamptz", field, count)
+		case "metadata":
+			query += fmt.Sprintf(" %s=NULLIF($%d, '')::jsonb", field, count)
+		default:
+			domainErr = domain.NewErrorBadRequest(fmt.Sprintf("Unknown field: %q", field))
+			return
+		}
+		newValues = append(newValues, value)
+		count++
+	}
+	query += fmt.Sprintf(" WHERE id=$1 AND is_deleted IS FALSE")
+	commandTag, err := s.db.Exec(ctx, query, newValues...)
+	if err != nil {
+		var pgErr *pgconn.PgError
+		if errors.As(err, &pgErr) {
+			switch pgErr.Code {
+			case "22P02":
+				domainErr = domain.NewErrorBadRequest("Invalid format of some values").Wrap(err)
+				return
+			case "22007":
+				domainErr = domain.NewErrorBadRequest(fmt.Sprintf("Invalid datetime: %q", updates["datetime"])).Wrap(err)
+				return
+			case "23502":
+				domainErr = domain.NewErrorBadRequest("Some fields cannot be empty").Wrap(err)
+				return
+			}
+		}
+		domainErr = domain.NewErrorUnexpected().Wrap(err)
+		return
+	}
+	if commandTag.RowsAffected() == 0 {
+		domainErr = domain.NewErrorFileNotFound(file_id).Wrap(err)
+		return
+	}
+	return
+}
+
+// Delete file
+func (s *FileRepository) Delete(ctx context.Context, file_id string) (domainErr *domain.DomainError) {
+	commandTag, err := s.db.Exec(ctx,
+		"UPDATE data.files SET is_deleted=true WHERE id=$1 AND is_deleted IS FALSE",
+		file_id)
+	if err != nil {
+		var pgErr *pgconn.PgError
+		if errors.As(err, &pgErr) {
+			switch pgErr.Code {
+			case "22P02":
+				domainErr = domain.NewErrorBadRequest(fmt.Sprintf("Invalid file id: %q", file_id)).Wrap(err)
+				return
+			}
+		}
+		domainErr = domain.NewErrorUnexpected().Wrap(err)
+		return
+	}
+	if commandTag.RowsAffected() == 0 {
+		domainErr = domain.NewErrorFileNotFound(file_id).Wrap(err)
+		return
+	}
+	return
+}
+
+// Get list of tags of file
+func (s *FileRepository) GetTags(ctx context.Context, user_id int, file_id string) (tags []domain.TagItem, domainErr *domain.DomainError) {
+	rows, err := s.db.Query(ctx, `
+		SELECT
+			t.id,
+			t.name,
+			t.color,
+			c.id,
+			c.name,
+			c.color
+		FROM data.tags t
+		LEFT JOIN data.categories c ON c.id=t.category_id
+		JOIN data.file_tag ft ON ft.tag_id=t.id AND ft.file_id=$2
+		JOIN data.files f ON f.id=$2
+		WHERE NOT f.is_deleted AND (f.creator_id=$1 OR (SELECT view FROM acl.files WHERE file_id=$2 AND user_id=$1) OR (SELECT is_admin FROM system.users WHERE id=$1))
+		`, user_id, file_id)
+	if err != nil {
+		var pgErr *pgconn.PgError
+		if errors.As(err, &pgErr) && (pgErr.Code == "22P02" || pgErr.Code == "22007") {
+			domainErr = domain.NewErrorBadRequest(pgErr.Message).Wrap(err)
+			return
+		}
+		domainErr = domain.NewErrorUnexpected().Wrap(err)
+		return
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var tag domain.TagItem
+		err = rows.Scan(&tag.ID, &tag.Name, &tag.Color, &tag.Category.ID, &tag.Category.Name, &tag.Category.Color)
+		if err != nil {
+			domainErr = domain.NewErrorUnexpected().Wrap(err)
+			return
+		}
+		tags = append(tags, tag)
+	}
+	err = rows.Err()
+	if err != nil {
+		domainErr = domain.NewErrorUnexpected().Wrap(err)
+	}
+	return
+}
--- a/backend/internal/infrastructure/persistence/postgres/utils.go
+++ b/backend/internal/infrastructure/persistence/postgres/utils.go
@ -1,21 +1,52 @@
 package postgres

 import (
+	"errors"
 	"fmt"
 	"net/http"
 	"strconv"
 	"strings"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
 )

+// Handle database error
+func handleDBError(errIn error) (statusCode int, err error) {
+	if errIn == nil {
+		statusCode = http.StatusOK
+		return
+	}
+	if errors.Is(errIn, pgx.ErrNoRows) {
+		err = fmt.Errorf("not found")
+		statusCode = http.StatusNotFound
+		return
+	}
+	var pgErr *pgconn.PgError
+	if errors.As(errIn, &pgErr) {
+		switch pgErr.Code {
+		case "22P02", "22007": // Invalid data format
+			err = fmt.Errorf("%s", pgErr.Message)
+			statusCode = http.StatusBadRequest
+			return
+		case "23505": // Unique constraint violation
+			err = fmt.Errorf("already exists")
+			statusCode = http.StatusConflict
+			return
+		}
+	}
+	return http.StatusInternalServerError, errIn
+}
+
 // Convert "filter" URL param to SQL "WHERE" condition
-func filterToSQL(filter string) (sql string, statusCode int, err error) {
+func filterToSQL(filter string) (sql string, err error) {
 	// filterTokens := strings.Split(string(filter), ";")
 	sql = "(true)"
 	return
 }

 // Convert "sort" URL param to SQL "ORDER BY"
-func sortToSQL(sort string) (sql string, statusCode int, err error) {
+func sortToSQL(sort string) (sql string, err error) {
 	if sort == "" {
 		return
 	}
@ -32,7 +63,6 @@ func sortToSQL(sort string) (sql string, statusCode int, err error) {
 			sortOrder = "DESC"
 		default:
 			err = fmt.Errorf("invalid sorting order mark: %q", sortOrder)
-			statusCode = http.StatusBadRequest
 			return
 		}
 		// validate sorting column
@ -40,7 +70,6 @@ func sortToSQL(sort string) (sql string, statusCode int, err error) {
 		n, err = strconv.Atoi(sortColumn)
 		if err != nil || n < 0 {
 			err = fmt.Errorf("invalid sorting column: %q", sortColumn)
-			statusCode = http.StatusBadRequest
 			return
 		}
 		// add sorting option to query
--- a/backend/internal/integration/server_test.go
+++ b/backend/internal/integration/server_test.go
@ -1,767 +0,0 @@
-// Package integration contains end-to-end tests that start a real HTTP server
-// against a disposable PostgreSQL database created on the fly.
-//
-// The test connects to an admin DSN (defaults to the local PG 16 socket) to
-// CREATE / DROP an ephemeral database per test suite run, then runs all goose
-// migrations on it.
-//
-// Override the admin DSN with TANABATA_TEST_ADMIN_DSN:
-//
-//	export TANABATA_TEST_ADMIN_DSN="host=/var/run/postgresql port=5434 user=h1k0 dbname=postgres sslmode=disable"
-//	go test -v -timeout 120s tanabata/backend/internal/integration
-package integration
-
-import (
-	"bytes"
-	"context"
-	"encoding/json"
-	"fmt"
-	"io"
-	"mime/multipart"
-	"net"
-	"net/http"
-	"net/http/httptest"
-	"os"
-	"path/filepath"
-	"strings"
-	"testing"
-	"time"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-	"github.com/jackc/pgx/v5/stdlib"
-	"github.com/pressly/goose/v3"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	"tanabata/backend/internal/db/postgres"
-	"tanabata/backend/internal/handler"
-	"tanabata/backend/internal/service"
-	"tanabata/backend/internal/storage"
-	"tanabata/backend/migrations"
-)
-
-// defaultAdminDSN is the fallback when TANABATA_TEST_ADMIN_DSN is unset.
-// Targets the PG 16 cluster on this machine (port 5434, Unix socket).
-const defaultAdminDSN = "host=/var/run/postgresql port=5434 user=h1k0 dbname=postgres sslmode=disable"
-
-// ---------------------------------------------------------------------------
-// Test harness
-// ---------------------------------------------------------------------------
-
-type harness struct {
-	t      *testing.T
-	server *httptest.Server
-	client *http.Client
-}
-
-// setupSuite creates an ephemeral database, runs migrations, wires the full
-// service graph into an httptest.Server, and registers cleanup.
-func setupSuite(t *testing.T) *harness {
-	t.Helper()
-	ctx := context.Background()
-
-	// --- Create an isolated test database ------------------------------------
-	adminDSN := os.Getenv("TANABATA_TEST_ADMIN_DSN")
-	if adminDSN == "" {
-		adminDSN = defaultAdminDSN
-	}
-
-	// Use a unique name so parallel test runs don't collide.
-	dbName := fmt.Sprintf("tanabata_test_%d", time.Now().UnixNano())
-
-	adminConn, err := pgx.Connect(ctx, adminDSN)
-	require.NoError(t, err, "connect to admin DSN: %s", adminDSN)
-
-	_, err = adminConn.Exec(ctx, "CREATE DATABASE "+dbName)
-	require.NoError(t, err)
-	adminConn.Close(ctx)
-
-	// Build the DSN for the new database (replace dbname= in adminDSN).
-	testDSN := replaceDSNDatabase(adminDSN, dbName)
-
-	t.Cleanup(func() {
-		// Drop all connections then drop the database.
-		conn, err := pgx.Connect(context.Background(), adminDSN)
-		if err != nil {
-			return
-		}
-		defer conn.Close(context.Background())
-		_, _ = conn.Exec(context.Background(),
-			"SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname = $1", dbName)
-		_, _ = conn.Exec(context.Background(), "DROP DATABASE IF EXISTS "+dbName)
-	})
-
-	// --- Migrations ----------------------------------------------------------
-	pool, err := pgxpool.New(ctx, testDSN)
-	require.NoError(t, err)
-	t.Cleanup(pool.Close)
-
-	migDB := stdlib.OpenDBFromPool(pool)
-	goose.SetBaseFS(migrations.FS)
-	require.NoError(t, goose.SetDialect("postgres"))
-	require.NoError(t, goose.Up(migDB, "."))
-	migDB.Close()
-
-	// --- Temp directories for storage ----------------------------------------
-	filesDir := t.TempDir()
-	thumbsDir := t.TempDir()
-
-	diskStorage, err := storage.NewDiskStorage(filesDir, thumbsDir, 160, 160, 1920, 1080)
-	require.NoError(t, err)
-
-	// --- Repositories --------------------------------------------------------
-	userRepo     := postgres.NewUserRepo(pool)
-	sessionRepo  := postgres.NewSessionRepo(pool)
-	fileRepo     := postgres.NewFileRepo(pool)
-	mimeRepo     := postgres.NewMimeRepo(pool)
-	aclRepo      := postgres.NewACLRepo(pool)
-	auditRepo    := postgres.NewAuditRepo(pool)
-	tagRepo      := postgres.NewTagRepo(pool)
-	tagRuleRepo  := postgres.NewTagRuleRepo(pool)
-	categoryRepo := postgres.NewCategoryRepo(pool)
-	poolRepo     := postgres.NewPoolRepo(pool)
-	transactor   := postgres.NewTransactor(pool)
-
-	// --- Services ------------------------------------------------------------
-	authSvc     := service.NewAuthService(userRepo, sessionRepo, "test-secret", 15*time.Minute, 720*time.Hour)
-	aclSvc      := service.NewACLService(aclRepo)
-	auditSvc    := service.NewAuditService(auditRepo)
-	tagSvc      := service.NewTagService(tagRepo, tagRuleRepo, aclSvc, auditSvc, transactor)
-	categorySvc := service.NewCategoryService(categoryRepo, tagRepo, aclSvc, auditSvc)
-	poolSvc     := service.NewPoolService(poolRepo, aclSvc, auditSvc)
-	fileSvc     := service.NewFileService(fileRepo, mimeRepo, diskStorage, aclSvc, auditSvc, tagSvc, transactor, filesDir)
-	userSvc     := service.NewUserService(userRepo, auditSvc)
-
-	// --- Handlers ------------------------------------------------------------
-	authMiddleware  := handler.NewAuthMiddleware(authSvc)
-	authHandler     := handler.NewAuthHandler(authSvc)
-	fileHandler     := handler.NewFileHandler(fileSvc, tagSvc)
-	tagHandler      := handler.NewTagHandler(tagSvc, fileSvc)
-	categoryHandler := handler.NewCategoryHandler(categorySvc)
-	poolHandler     := handler.NewPoolHandler(poolSvc)
-	userHandler     := handler.NewUserHandler(userSvc)
-	aclHandler      := handler.NewACLHandler(aclSvc)
-	auditHandler    := handler.NewAuditHandler(auditSvc)
-
-	r := handler.NewRouter(
-		authMiddleware, authHandler,
-		fileHandler, tagHandler, categoryHandler, poolHandler,
-		userHandler, aclHandler, auditHandler,
-	)
-
-	srv := httptest.NewServer(r)
-	t.Cleanup(srv.Close)
-
-	return &harness{
-		t:      t,
-		server: srv,
-		client: srv.Client(),
-	}
-}
-
-// ---------------------------------------------------------------------------
-// HTTP helpers
-// ---------------------------------------------------------------------------
-
-// testResponse wraps an HTTP response with the body already read into memory.
-// This avoids the "body consumed by error-message arg before decode" pitfall.
-type testResponse struct {
-	StatusCode int
-	bodyBytes  []byte
-}
-
-// String returns the body as a string (for use in assertion messages).
-func (r *testResponse) String() string { return string(r.bodyBytes) }
-
-// decode unmarshals the body JSON into dst.
-func (r *testResponse) decode(t *testing.T, dst any) {
-	t.Helper()
-	require.NoError(t, json.Unmarshal(r.bodyBytes, dst), "decode body: %s", r.String())
-}
-
-func (h *harness) url(path string) string {
-	return h.server.URL + "/api/v1" + path
-}
-
-func (h *harness) do(method, path string, body io.Reader, token string, contentType string) *testResponse {
-	h.t.Helper()
-	req, err := http.NewRequest(method, h.url(path), body)
-	require.NoError(h.t, err)
-	if token != "" {
-		req.Header.Set("Authorization", "Bearer "+token)
-	}
-	if contentType != "" {
-		req.Header.Set("Content-Type", contentType)
-	}
-	httpResp, err := h.client.Do(req)
-	require.NoError(h.t, err)
-	b, _ := io.ReadAll(httpResp.Body)
-	httpResp.Body.Close()
-	return &testResponse{StatusCode: httpResp.StatusCode, bodyBytes: b}
-}
-
-func (h *harness) doJSON(method, path string, payload any, token string) *testResponse {
-	h.t.Helper()
-	var buf io.Reader
-	if payload != nil {
-		b, err := json.Marshal(payload)
-		require.NoError(h.t, err)
-		buf = bytes.NewReader(b)
-	}
-	return h.do(method, path, buf, token, "application/json")
-}
-
-// login posts credentials and returns an access token.
-func (h *harness) login(name, password string) string {
-	h.t.Helper()
-	resp := h.doJSON("POST", "/auth/login", map[string]string{
-		"name": name, "password": password,
-	}, "")
-	require.Equal(h.t, http.StatusOK, resp.StatusCode, "login failed: %s", resp)
-	var out struct {
-		AccessToken string `json:"access_token"`
-	}
-	resp.decode(h.t, &out)
-	require.NotEmpty(h.t, out.AccessToken)
-	return out.AccessToken
-}
-
-// uploadJPEG uploads a minimal valid JPEG and returns the created file object.
-func (h *harness) uploadJPEG(token, originalName string) map[string]any {
-	h.t.Helper()
-
-	var buf bytes.Buffer
-	mw := multipart.NewWriter(&buf)
-	fw, err := mw.CreateFormFile("file", originalName)
-	require.NoError(h.t, err)
-	_, err = fw.Write(minimalJPEG())
-	require.NoError(h.t, err)
-	require.NoError(h.t, mw.Close())
-
-	resp := h.do("POST", "/files", &buf, token, mw.FormDataContentType())
-	require.Equal(h.t, http.StatusCreated, resp.StatusCode, "upload failed: %s", resp)
-
-	var out map[string]any
-	resp.decode(h.t, &out)
-	return out
-}
-
-// ---------------------------------------------------------------------------
-// Main integration test
-// ---------------------------------------------------------------------------
-
-func TestFullFlow(t *testing.T) {
-	if testing.Short() {
-		t.Skip("skipping integration test in short mode")
-	}
-
-	h := setupSuite(t)
-
-	// =========================================================================
-	// 1. Admin login (seeded by 007_seed_data.sql)
-	// =========================================================================
-	adminToken := h.login("admin", "admin")
-
-	// =========================================================================
-	// 2. Create a regular user
-	// =========================================================================
-	resp := h.doJSON("POST", "/users", map[string]any{
-		"name": "alice", "password": "alicepass", "can_create": true,
-	}, adminToken)
-	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
-	var aliceUser map[string]any
-	resp.decode(t, &aliceUser)
-	assert.Equal(t, "alice", aliceUser["name"])
-
-	// Create a second regular user for ACL testing.
-	resp = h.doJSON("POST", "/users", map[string]any{
-		"name": "bob", "password": "bobpass", "can_create": true,
-	}, adminToken)
-	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
-
-	// =========================================================================
-	// 3. Log in as alice
-	// =========================================================================
-	aliceToken := h.login("alice", "alicepass")
-	bobToken   := h.login("bob", "bobpass")
-
-	// =========================================================================
-	// 4. Alice uploads a private JPEG
-	// =========================================================================
-	fileObj := h.uploadJPEG(aliceToken, "sunset.jpg")
-	fileID, ok := fileObj["id"].(string)
-	require.True(t, ok, "file id missing")
-	assert.Equal(t, "sunset.jpg", fileObj["original_name"])
-	assert.Equal(t, false, fileObj["is_public"])
-
-	// =========================================================================
-	// 5. Create a tag and assign it to the file
-	// =========================================================================
-	resp = h.doJSON("POST", "/tags", map[string]any{
-		"name": "nature", "is_public": true,
-	}, aliceToken)
-	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
-	var tagObj map[string]any
-	resp.decode(t, &tagObj)
-	tagID := tagObj["id"].(string)
-
-	resp = h.doJSON("PUT", "/files/"+fileID+"/tags", map[string]any{
-		"tag_ids": []string{tagID},
-	}, aliceToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
-
-	// Verify tag is returned with the file.
-	resp = h.doJSON("GET", "/files/"+fileID, nil, aliceToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var fileWithTags map[string]any
-	resp.decode(t, &fileWithTags)
-	tags := fileWithTags["tags"].([]any)
-	require.Len(t, tags, 1)
-	assert.Equal(t, "nature", tags[0].(map[string]any)["name"])
-
-	// =========================================================================
-	// 6. Filter files by tag
-	// =========================================================================
-	resp = h.doJSON("GET", "/files?filter=%7Bt%3D"+tagID+"%7D", nil, aliceToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var filePage map[string]any
-	resp.decode(t, &filePage)
-	items := filePage["items"].([]any)
-	require.Len(t, items, 1)
-	assert.Equal(t, fileID, items[0].(map[string]any)["id"])
-
-	// =========================================================================
-	// 7. ACL — Bob cannot see Alice's private file
-	// =========================================================================
-	resp = h.doJSON("GET", "/files/"+fileID, nil, bobToken)
-	assert.Equal(t, http.StatusForbidden, resp.StatusCode, resp.String())
-
-	// Grant Bob view access.
-	bobUserID := int(aliceUser["id"].(float64)) // alice's id used for reference; get bob's
-	// Resolve bob's real ID via admin.
-	resp = h.doJSON("GET", "/users", nil, adminToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var usersPage map[string]any
-	resp.decode(t, &usersPage)
-	var bobID float64
-	for _, u := range usersPage["items"].([]any) {
-		um := u.(map[string]any)
-		if um["name"] == "bob" {
-			bobID = um["id"].(float64)
-		}
-	}
-	_ = bobUserID
-	require.NotZero(t, bobID)
-
-	resp = h.doJSON("PUT", "/acl/file/"+fileID, map[string]any{
-		"permissions": []map[string]any{
-			{"user_id": bobID, "can_view": true, "can_edit": false},
-		},
-	}, aliceToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
-
-	// Now Bob can view.
-	resp = h.doJSON("GET", "/files/"+fileID, nil, bobToken)
-	assert.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
-
-	// =========================================================================
-	// 8. Create a pool and add the file
-	// =========================================================================
-	resp = h.doJSON("POST", "/pools", map[string]any{
-		"name": "alice's pool", "is_public": false,
-	}, aliceToken)
-	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
-	var poolObj map[string]any
-	resp.decode(t, &poolObj)
-	poolID := poolObj["id"].(string)
-	assert.Equal(t, "alice's pool", poolObj["name"])
-
-	resp = h.doJSON("POST", "/pools/"+poolID+"/files", map[string]any{
-		"file_ids": []string{fileID},
-	}, aliceToken)
-	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
-
-	// Pool file count should now be 1.
-	resp = h.doJSON("GET", "/pools/"+poolID, nil, aliceToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var poolFull map[string]any
-	resp.decode(t, &poolFull)
-	assert.Equal(t, float64(1), poolFull["file_count"])
-
-	// List pool files and verify position.
-	resp = h.doJSON("GET", "/pools/"+poolID+"/files", nil, aliceToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var poolFiles map[string]any
-	resp.decode(t, &poolFiles)
-	poolItems := poolFiles["items"].([]any)
-	require.Len(t, poolItems, 1)
-	assert.Equal(t, fileID, poolItems[0].(map[string]any)["id"])
-
-	// =========================================================================
-	// 9. Trash flow: soft-delete → list trash → restore → permanent delete
-	// =========================================================================
-
-	// Soft-delete the file.
-	resp = h.doJSON("DELETE", "/files/"+fileID, nil, aliceToken)
-	require.Equal(t, http.StatusNoContent, resp.StatusCode, resp.String())
-
-	// File no longer appears in normal listing.
-	resp = h.doJSON("GET", "/files", nil, aliceToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var normalPage map[string]any
-	resp.decode(t, &normalPage)
-	normalItems, _ := normalPage["items"].([]any)
-	assert.Len(t, normalItems, 0)
-
-	// File appears in trash listing.
-	resp = h.doJSON("GET", "/files?trash=true", nil, aliceToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var trashPage map[string]any
-	resp.decode(t, &trashPage)
-	trashItems := trashPage["items"].([]any)
-	require.Len(t, trashItems, 1)
-	assert.Equal(t, fileID, trashItems[0].(map[string]any)["id"])
-	assert.Equal(t, true, trashItems[0].(map[string]any)["is_deleted"])
-
-	// Restore the file.
-	resp = h.doJSON("POST", "/files/"+fileID+"/restore", nil, aliceToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
-
-	// File is back in normal listing.
-	resp = h.doJSON("GET", "/files", nil, aliceToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var restoredPage map[string]any
-	resp.decode(t, &restoredPage)
-	restoredItems := restoredPage["items"].([]any)
-	require.Len(t, restoredItems, 1)
-	assert.Equal(t, fileID, restoredItems[0].(map[string]any)["id"])
-
-	// Soft-delete again then permanently delete.
-	resp = h.doJSON("DELETE", "/files/"+fileID, nil, aliceToken)
-	require.Equal(t, http.StatusNoContent, resp.StatusCode)
-
-	resp = h.doJSON("DELETE", "/files/"+fileID+"/permanent", nil, aliceToken)
-	require.Equal(t, http.StatusNoContent, resp.StatusCode, resp.String())
-
-	// File is gone entirely.
-	resp = h.doJSON("GET", "/files/"+fileID, nil, aliceToken)
-	assert.Equal(t, http.StatusNotFound, resp.StatusCode, resp.String())
-
-	// =========================================================================
-	// 10. Audit log records actions (admin only)
-	// =========================================================================
-	resp = h.doJSON("GET", "/audit", nil, adminToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var auditPage map[string]any
-	resp.decode(t, &auditPage)
-	auditItems := auditPage["items"].([]any)
-	assert.NotEmpty(t, auditItems, "audit log should have entries")
-
-	// Non-admin cannot read the audit log.
-	resp = h.doJSON("GET", "/audit", nil, aliceToken)
-	assert.Equal(t, http.StatusForbidden, resp.StatusCode, resp.String())
-}
-
-// ---------------------------------------------------------------------------
-// Additional targeted tests
-// ---------------------------------------------------------------------------
-
-// TestBlockedUserCannotLogin verifies that blocking a user prevents login.
-func TestBlockedUserCannotLogin(t *testing.T) {
-	if testing.Short() {
-		t.Skip("skipping integration test in short mode")
-	}
-
-	h := setupSuite(t)
-	adminToken := h.login("admin", "admin")
-
-	// Create user.
-	resp := h.doJSON("POST", "/users", map[string]any{
-		"name": "charlie", "password": "charliepass",
-	}, adminToken)
-	require.Equal(t, http.StatusCreated, resp.StatusCode)
-	var u map[string]any
-	resp.decode(t, &u)
-	userID := u["id"].(float64)
-
-	// Block charlie.
-	resp = h.doJSON("PATCH", fmt.Sprintf("/users/%.0f", userID), map[string]any{
-		"is_blocked": true,
-	}, adminToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-
-	// Login attempt should return 403.
-	resp = h.doJSON("POST", "/auth/login", map[string]any{
-		"name": "charlie", "password": "charliepass",
-	}, "")
-	assert.Equal(t, http.StatusForbidden, resp.StatusCode)
-}
-
-// TestPoolReorder verifies gap-based position reassignment.
-func TestPoolReorder(t *testing.T) {
-	if testing.Short() {
-		t.Skip("skipping integration test in short mode")
-	}
-
-	h := setupSuite(t)
-	adminToken := h.login("admin", "admin")
-
-	// Upload two files.
-	f1 := h.uploadJPEG(adminToken, "a.jpg")
-	f2 := h.uploadJPEG(adminToken, "b.jpg")
-	id1 := f1["id"].(string)
-	id2 := f2["id"].(string)
-
-	// Create pool and add both files.
-	resp := h.doJSON("POST", "/pools", map[string]any{"name": "reorder-test"}, adminToken)
-	require.Equal(t, http.StatusCreated, resp.StatusCode)
-	var pool map[string]any
-	resp.decode(t, &pool)
-	poolID := pool["id"].(string)
-
-	resp = h.doJSON("POST", "/pools/"+poolID+"/files", map[string]any{
-		"file_ids": []string{id1, id2},
-	}, adminToken)
-	require.Equal(t, http.StatusCreated, resp.StatusCode)
-
-	// Verify initial order: id1 before id2.
-	resp = h.doJSON("GET", "/pools/"+poolID+"/files", nil, adminToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var page map[string]any
-	resp.decode(t, &page)
-	items := page["items"].([]any)
-	require.Len(t, items, 2)
-	assert.Equal(t, id1, items[0].(map[string]any)["id"])
-	assert.Equal(t, id2, items[1].(map[string]any)["id"])
-
-	// Reorder: id2 first.
-	resp = h.doJSON("PUT", "/pools/"+poolID+"/files/reorder", map[string]any{
-		"file_ids": []string{id2, id1},
-	}, adminToken)
-	require.Equal(t, http.StatusNoContent, resp.StatusCode, resp.String())
-
-	// Verify new order.
-	resp = h.doJSON("GET", "/pools/"+poolID+"/files", nil, adminToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var page2 map[string]any
-	resp.decode(t, &page2)
-	items2 := page2["items"].([]any)
-	require.Len(t, items2, 2)
-	assert.Equal(t, id2, items2[0].(map[string]any)["id"])
-	assert.Equal(t, id1, items2[1].(map[string]any)["id"])
-}
-
-// TestTagRuleActivateApplyToExisting verifies that activating a rule with
-// apply_to_existing=true retroactively tags existing files, including
-// transitive rules (A→B active+apply, B→C already active → file gets A,B,C).
-func TestTagRuleActivateApplyToExisting(t *testing.T) {
-	if testing.Short() {
-		t.Skip("skipping integration test in short mode")
-	}
-
-	h := setupSuite(t)
-	tok := h.login("admin", "admin")
-
-	// Create three tags: A, B, C.
-	mkTag := func(name string) string {
-		resp := h.doJSON("POST", "/tags", map[string]any{"name": name}, tok)
-		require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
-		var obj map[string]any
-		resp.decode(t, &obj)
-		return obj["id"].(string)
-	}
-	tagA := mkTag("animal")
-	tagB := mkTag("living-thing")
-	tagC := mkTag("organism")
-
-	// Rule A→B: created inactive so it does NOT fire on assign.
-	resp := h.doJSON("POST", "/tags/"+tagA+"/rules", map[string]any{
-		"then_tag_id": tagB,
-		"is_active":   false,
-	}, tok)
-	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
-
-	// Rule B→C: active, so it fires transitively when B is applied.
-	resp = h.doJSON("POST", "/tags/"+tagB+"/rules", map[string]any{
-		"then_tag_id": tagC,
-		"is_active":   true,
-	}, tok)
-	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
-
-	// Upload a file and assign only tag A. A→B is inactive so only A is set.
-	file := h.uploadJPEG(tok, "cat.jpg")
-	fileID := file["id"].(string)
-	resp = h.doJSON("PUT", "/files/"+fileID+"/tags", map[string]any{
-		"tag_ids": []string{tagA},
-	}, tok)
-	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
-
-	tagNames := func() []string {
-		r := h.doJSON("GET", "/files/"+fileID+"/tags", nil, tok)
-		require.Equal(t, http.StatusOK, r.StatusCode)
-		var items []any
-		r.decode(t, &items)
-		names := make([]string, 0, len(items))
-		for _, it := range items {
-			names = append(names, it.(map[string]any)["name"].(string))
-		}
-		return names
-	}
-
-	// Before activation: file should only have tag A.
-	assert.ElementsMatch(t, []string{"animal"}, tagNames())
-
-	// Activate A→B WITHOUT apply_to_existing — existing file must not change.
-	resp = h.doJSON("PATCH", "/tags/"+tagA+"/rules/"+tagB, map[string]any{
-		"is_active":        true,
-		"apply_to_existing": false,
-	}, tok)
-	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
-	assert.ElementsMatch(t, []string{"animal"}, tagNames(), "file should be unchanged when apply_to_existing=false")
-
-	// Deactivate again so we can test the positive case cleanly.
-	resp = h.doJSON("PATCH", "/tags/"+tagA+"/rules/"+tagB, map[string]any{
-		"is_active": false,
-	}, tok)
-	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
-
-	// Activate A→B WITH apply_to_existing=true.
-	// Expectation: file gets B directly, and C transitively via the active B→C rule.
-	resp = h.doJSON("PATCH", "/tags/"+tagA+"/rules/"+tagB, map[string]any{
-		"is_active":        true,
-		"apply_to_existing": true,
-	}, tok)
-	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
-	assert.ElementsMatch(t, []string{"animal", "living-thing", "organism"}, tagNames())
-}
-
-// TestTagAutoRule verifies that adding a tag automatically applies then_tags.
-func TestTagAutoRule(t *testing.T) {
-	if testing.Short() {
-		t.Skip("skipping integration test in short mode")
-	}
-
-	h := setupSuite(t)
-	adminToken := h.login("admin", "admin")
-
-	// Create two tags: "outdoor" and "nature".
-	resp := h.doJSON("POST", "/tags", map[string]any{"name": "outdoor"}, adminToken)
-	require.Equal(t, http.StatusCreated, resp.StatusCode)
-	var outdoor map[string]any
-	resp.decode(t, &outdoor)
-	outdoorID := outdoor["id"].(string)
-
-	resp = h.doJSON("POST", "/tags", map[string]any{"name": "nature"}, adminToken)
-	require.Equal(t, http.StatusCreated, resp.StatusCode)
-	var nature map[string]any
-	resp.decode(t, &nature)
-	natureID := nature["id"].(string)
-
-	// Create rule: when "outdoor" → also apply "nature".
-	resp = h.doJSON("POST", "/tags/"+outdoorID+"/rules", map[string]any{
-		"then_tag_id": natureID,
-	}, adminToken)
-	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
-
-	// Upload a file and assign only "outdoor".
-	file := h.uploadJPEG(adminToken, "park.jpg")
-	fileID := file["id"].(string)
-
-	resp = h.doJSON("PUT", "/files/"+fileID+"/tags", map[string]any{
-		"tag_ids": []string{outdoorID},
-	}, adminToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
-
-	// Both "outdoor" and "nature" should be on the file.
-	resp = h.doJSON("GET", "/files/"+fileID+"/tags", nil, adminToken)
-	require.Equal(t, http.StatusOK, resp.StatusCode)
-	var tagsResp []any
-	resp.decode(t, &tagsResp)
-	names := make([]string, 0, len(tagsResp))
-	for _, tg := range tagsResp {
-		names = append(names, tg.(map[string]any)["name"].(string))
-	}
-	assert.ElementsMatch(t, []string{"outdoor", "nature"}, names)
-}
-
-// ---------------------------------------------------------------------------
-// Test helpers
-// ---------------------------------------------------------------------------
-
-// minimalJPEG returns the bytes of a 1×1 white JPEG image.
-// Generated offline; no external dependency needed.
-func minimalJPEG() []byte {
-	// This is a valid minimal JPEG: SOI + APP0 + DQT + SOF0 + DHT + SOS + EOI.
-	// 1×1 white pixel, quality ~50. Verified with `file` and browsers.
-	return []byte{
-		0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01,
-		0x01, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0xff, 0xdb, 0x00, 0x43,
-		0x00, 0x08, 0x06, 0x06, 0x07, 0x06, 0x05, 0x08, 0x07, 0x07, 0x07, 0x09,
-		0x09, 0x08, 0x0a, 0x0c, 0x14, 0x0d, 0x0c, 0x0b, 0x0b, 0x0c, 0x19, 0x12,
-		0x13, 0x0f, 0x14, 0x1d, 0x1a, 0x1f, 0x1e, 0x1d, 0x1a, 0x1c, 0x1c, 0x20,
-		0x24, 0x2e, 0x27, 0x20, 0x22, 0x2c, 0x23, 0x1c, 0x1c, 0x28, 0x37, 0x29,
-		0x2c, 0x30, 0x31, 0x34, 0x34, 0x34, 0x1f, 0x27, 0x39, 0x3d, 0x38, 0x32,
-		0x3c, 0x2e, 0x33, 0x34, 0x32, 0xff, 0xc0, 0x00, 0x0b, 0x08, 0x00, 0x01,
-		0x00, 0x01, 0x01, 0x01, 0x11, 0x00, 0xff, 0xc4, 0x00, 0x1f, 0x00, 0x00,
-		0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00,
-		0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
-		0x09, 0x0a, 0x0b, 0xff, 0xc4, 0x00, 0xb5, 0x10, 0x00, 0x02, 0x01, 0x03,
-		0x03, 0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7d,
-		0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06,
-		0x13, 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
-		0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72,
-		0x82, 0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
-		0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45,
-		0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
-		0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75,
-		0x76, 0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
-		0x8a, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4,
-		0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
-		0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca,
-		0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, 0xe3,
-		0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5,
-		0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xff, 0xda, 0x00, 0x08, 0x01, 0x01, 0x00,
-		0x00, 0x3f, 0x00, 0xfb, 0xd3, 0xff, 0xd9,
-	}
-}
-
-// replaceDSNDatabase returns a copy of dsn with the dbname parameter replaced.
-// Handles both key=value libpq-style strings and postgres:// URLs.
-func replaceDSNDatabase(dsn, newDB string) string {
-	// key=value style: replace dbname=xxx or append if absent.
-	if !strings.Contains(dsn, "://") {
-		const key = "dbname="
-		if idx := strings.Index(dsn, key); idx >= 0 {
-			end := strings.IndexByte(dsn[idx+len(key):], ' ')
-			if end < 0 {
-				return dsn[:idx] + key + newDB
-			}
-			return dsn[:idx] + key + newDB + dsn[idx+len(key)+end:]
-		}
-		return dsn + " dbname=" + newDB
-	}
-	// URL style: not used in our defaults, but handled for completeness.
-	return dsn
-}
-
-// freePort returns an available TCP port on localhost.
-func freePort() int {
-	l, _ := net.Listen("tcp", ":0")
-	defer l.Close()
-	return l.Addr().(*net.TCPAddr).Port
-}
-
-// writeFile writes content to a temp file and returns its path.
-func writeFile(t *testing.T, dir, name string, content []byte) string {
-	t.Helper()
-	path := filepath.Join(dir, name)
-	require.NoError(t, os.WriteFile(path, content, 0o644))
-	return path
-}
-
-// suppress unused-import warnings for helpers kept for future use.
-var (
-	_ = freePort
-	_ = writeFile
-)
--- a/backend/internal/interfaces/rest/handlers/error_handler.go
+++ b/backend/internal/interfaces/rest/handlers/error_handler.go
@ -0,0 +1,43 @@
+package rest
+
+import (
+	"net/http"
+
+	"tanabata/internal/domain"
+)
+
+type ErrorResponse struct {
+	Error   string `json:"error"`
+	Code    string `json:"code,omitempty"`
+	Message string `json:"message,omitempty"`
+}
+
+type ErrorMapper struct{}
+
+func (m *ErrorMapper) MapError(err domain.DomainError) (int, ErrorResponse) {
+	switch err.Code {
+	case domain.ErrCodeFileNotFound:
+		return http.StatusNotFound, ErrorResponse{
+			Error:   "Not Found",
+			Code:    string(err.Code),
+			Message: err.Message,
+		}
+	case domain.ErrCodeMIMENotSupported:
+		return http.StatusNotFound, ErrorResponse{
+			Error:   "MIME not supported",
+			Code:    string(err.Code),
+			Message: err.Message,
+		}
+	case domain.ErrCodeBadRequest:
+		return http.StatusNotFound, ErrorResponse{
+			Error:   "Bad Request",
+			Code:    string(err.Code),
+			Message: err.Message,
+		}
+	}
+	return http.StatusInternalServerError, ErrorResponse{
+		Error:   "Internal Server Error",
+		Code:    string(err.Code),
+		Message: err.Message,
+	}
+}
--- a/backend/internal/port/repository.go
+++ b/backend/internal/port/repository.go
@ -1,170 +0,0 @@
-package port
-
-import (
-	"context"
-	"time"
-
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-)
-
-// Transactor executes fn inside a single database transaction.
-// All repository calls made within fn receive the transaction via context.
-type Transactor interface {
-	WithTx(ctx context.Context, fn func(ctx context.Context) error) error
-}
-
-// OffsetParams holds common offset-pagination and sort parameters.
-type OffsetParams struct {
-	Sort   string
-	Order  string // "asc" | "desc"
-	Search string
-	Offset int
-	Limit  int
-}
-
-// PoolFileListParams holds parameters for listing files inside a pool.
-type PoolFileListParams struct {
-	Cursor string
-	Limit  int
-	Filter string // filter DSL expression
-}
-
-// FileRepo is the persistence interface for file records.
-type FileRepo interface {
-	// List returns a cursor-based page of files.
-	List(ctx context.Context, params domain.FileListParams) (*domain.FilePage, error)
-	// GetByID returns the file with its tags loaded.
-	GetByID(ctx context.Context, id uuid.UUID) (*domain.File, error)
-	// Create inserts a new file record and returns it.
-	Create(ctx context.Context, f *domain.File) (*domain.File, error)
-	// Update applies partial metadata changes and returns the updated record.
-	Update(ctx context.Context, id uuid.UUID, f *domain.File) (*domain.File, error)
-	// SoftDelete moves a file to trash (sets is_deleted = true).
-	SoftDelete(ctx context.Context, id uuid.UUID) error
-	// Restore moves a file out of trash (sets is_deleted = false).
-	Restore(ctx context.Context, id uuid.UUID) (*domain.File, error)
-	// DeletePermanent removes a file record. Only allowed when is_deleted = true.
-	DeletePermanent(ctx context.Context, id uuid.UUID) error
-
-	// ListTags returns all tags assigned to a file.
-	ListTags(ctx context.Context, fileID uuid.UUID) ([]domain.Tag, error)
-	// SetTags replaces all tags on a file (full replace semantics).
-	SetTags(ctx context.Context, fileID uuid.UUID, tagIDs []uuid.UUID) error
-}
-
-// TagRepo is the persistence interface for tags.
-type TagRepo interface {
-	List(ctx context.Context, params OffsetParams) (*domain.TagOffsetPage, error)
-	// ListByCategory returns tags belonging to a specific category.
-	ListByCategory(ctx context.Context, categoryID uuid.UUID, params OffsetParams) (*domain.TagOffsetPage, error)
-	GetByID(ctx context.Context, id uuid.UUID) (*domain.Tag, error)
-	Create(ctx context.Context, t *domain.Tag) (*domain.Tag, error)
-	Update(ctx context.Context, id uuid.UUID, t *domain.Tag) (*domain.Tag, error)
-	Delete(ctx context.Context, id uuid.UUID) error
-
-	// ListByFile returns all tags assigned to a specific file, ordered by name.
-	ListByFile(ctx context.Context, fileID uuid.UUID) ([]domain.Tag, error)
-	// AddFileTag inserts a single file→tag relation. No-op if already present.
-	AddFileTag(ctx context.Context, fileID, tagID uuid.UUID) error
-	// RemoveFileTag deletes a single file→tag relation.
-	RemoveFileTag(ctx context.Context, fileID, tagID uuid.UUID) error
-	// SetFileTags replaces all tags on a file (full replace semantics).
-	SetFileTags(ctx context.Context, fileID uuid.UUID, tagIDs []uuid.UUID) error
-	// CommonTagsForFiles returns tags present on every one of the given files.
-	CommonTagsForFiles(ctx context.Context, fileIDs []uuid.UUID) ([]domain.Tag, error)
-	// PartialTagsForFiles returns tags present on some but not all of the given files.
-	PartialTagsForFiles(ctx context.Context, fileIDs []uuid.UUID) ([]domain.Tag, error)
-}
-
-// TagRuleRepo is the persistence interface for auto-tag rules.
-type TagRuleRepo interface {
-	// ListByTag returns all rules where WhenTagID == tagID.
-	ListByTag(ctx context.Context, tagID uuid.UUID) ([]domain.TagRule, error)
-	Create(ctx context.Context, r domain.TagRule) (*domain.TagRule, error)
-	// SetActive toggles a rule's is_active flag. When active and applyToExisting
-	// are both true, the full transitive expansion of thenTagID is retroactively
-	// applied to all files that already carry whenTagID.
-	SetActive(ctx context.Context, whenTagID, thenTagID uuid.UUID, active, applyToExisting bool) error
-	Delete(ctx context.Context, whenTagID, thenTagID uuid.UUID) error
-}
-
-// CategoryRepo is the persistence interface for categories.
-type CategoryRepo interface {
-	List(ctx context.Context, params OffsetParams) (*domain.CategoryOffsetPage, error)
-	GetByID(ctx context.Context, id uuid.UUID) (*domain.Category, error)
-	Create(ctx context.Context, c *domain.Category) (*domain.Category, error)
-	Update(ctx context.Context, id uuid.UUID, c *domain.Category) (*domain.Category, error)
-	Delete(ctx context.Context, id uuid.UUID) error
-}
-
-// PoolRepo is the persistence interface for pools and pool–file membership.
-type PoolRepo interface {
-	List(ctx context.Context, params OffsetParams) (*domain.PoolOffsetPage, error)
-	GetByID(ctx context.Context, id uuid.UUID) (*domain.Pool, error)
-	Create(ctx context.Context, p *domain.Pool) (*domain.Pool, error)
-	Update(ctx context.Context, id uuid.UUID, p *domain.Pool) (*domain.Pool, error)
-	Delete(ctx context.Context, id uuid.UUID) error
-
-	// ListFiles returns pool files ordered by position (cursor-based).
-	ListFiles(ctx context.Context, poolID uuid.UUID, params PoolFileListParams) (*domain.PoolFilePage, error)
-	// AddFiles appends files starting at position; nil position means append at end.
-	AddFiles(ctx context.Context, poolID uuid.UUID, fileIDs []uuid.UUID, position *int) error
-	// RemoveFiles removes files from the pool.
-	RemoveFiles(ctx context.Context, poolID uuid.UUID, fileIDs []uuid.UUID) error
-	// Reorder sets the full ordered sequence of file IDs in the pool.
-	Reorder(ctx context.Context, poolID uuid.UUID, fileIDs []uuid.UUID) error
-}
-
-// UserRepo is the persistence interface for users.
-type UserRepo interface {
-	List(ctx context.Context, params OffsetParams) (*domain.UserPage, error)
-	GetByID(ctx context.Context, id int16) (*domain.User, error)
-	// GetByName is used during login to look up credentials.
-	GetByName(ctx context.Context, name string) (*domain.User, error)
-	Create(ctx context.Context, u *domain.User) (*domain.User, error)
-	Update(ctx context.Context, id int16, u *domain.User) (*domain.User, error)
-	Delete(ctx context.Context, id int16) error
-}
-
-// SessionRepo is the persistence interface for auth sessions.
-type SessionRepo interface {
-	// ListByUser returns all active sessions for a user.
-	ListByUser(ctx context.Context, userID int16) (*domain.SessionList, error)
-	// GetByTokenHash looks up a session by the hashed refresh token.
-	GetByTokenHash(ctx context.Context, hash string) (*domain.Session, error)
-	Create(ctx context.Context, s *domain.Session) (*domain.Session, error)
-	// UpdateLastActivity refreshes the last_activity timestamp.
-	UpdateLastActivity(ctx context.Context, id int, t time.Time) error
-	// Delete terminates a single session.
-	Delete(ctx context.Context, id int) error
-	// DeleteByUserID terminates all sessions for a user (logout everywhere).
-	DeleteByUserID(ctx context.Context, userID int16) error
-}
-
-// ACLRepo is the persistence interface for per-object permissions.
-type ACLRepo interface {
-	// List returns all permission entries for a given object.
-	List(ctx context.Context, objectTypeID int16, objectID uuid.UUID) ([]domain.Permission, error)
-	// Get returns the permission entry for a specific user and object; returns
-	// ErrNotFound if no entry exists.
-	Get(ctx context.Context, userID int16, objectTypeID int16, objectID uuid.UUID) (*domain.Permission, error)
-	// Set replaces all permissions for an object (full replace semantics).
-	Set(ctx context.Context, objectTypeID int16, objectID uuid.UUID, perms []domain.Permission) error
-}
-
-// AuditRepo is the persistence interface for the audit log.
-type AuditRepo interface {
-	Log(ctx context.Context, entry domain.AuditEntry) error
-	List(ctx context.Context, filter domain.AuditFilter) (*domain.AuditPage, error)
-}
-
-// MimeRepo is the persistence interface for the MIME type whitelist.
-type MimeRepo interface {
-	// List returns all supported MIME types.
-	List(ctx context.Context) ([]domain.MIMEType, error)
-	// GetByName returns the MIME type record for a given MIME name (e.g. "image/jpeg").
-	// Returns ErrUnsupportedMIME if not in the whitelist.
-	GetByName(ctx context.Context, name string) (*domain.MIMEType, error)
-}
--- a/backend/internal/port/storage.go
+++ b/backend/internal/port/storage.go
@ -1,31 +0,0 @@
-package port
-
-import (
-	"context"
-	"io"
-
-	"github.com/google/uuid"
-)
-
-// FileStorage abstracts disk (or object-store) operations for file content,
-// thumbnails, and previews.
-type FileStorage interface {
-	// Save writes the reader's content to storage and returns the number of
-	// bytes written.
-	Save(ctx context.Context, id uuid.UUID, r io.Reader) (int64, error)
-
-	// Read opens the file content for reading. The caller must close the returned
-	// ReadCloser.
-	Read(ctx context.Context, id uuid.UUID) (io.ReadCloser, error)
-
-	// Delete removes the file content from storage.
-	Delete(ctx context.Context, id uuid.UUID) error
-
-	// Thumbnail opens the pre-generated thumbnail (JPEG). Returns ErrNotFound
-	// if the thumbnail has not been generated yet.
-	Thumbnail(ctx context.Context, id uuid.UUID) (io.ReadCloser, error)
-
-	// Preview opens the pre-generated preview image (JPEG). Returns ErrNotFound
-	// if the preview has not been generated yet.
-	Preview(ctx context.Context, id uuid.UUID) (io.ReadCloser, error)
-}
--- a/backend/internal/service/acl_service.go
+++ b/backend/internal/service/acl_service.go
@ -1,81 +0,0 @@
-package service
-
-import (
-	"context"
-	"errors"
-
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// ACLService handles access control checks and permission management.
-type ACLService struct {
-	aclRepo port.ACLRepo
-}
-
-func NewACLService(aclRepo port.ACLRepo) *ACLService {
-	return &ACLService{aclRepo: aclRepo}
-}
-
-// CanView returns true if the user may view the object.
-// isAdmin, creatorID, isPublic must be populated from the object record by the caller.
-func (s *ACLService) CanView(
-	ctx context.Context,
-	userID int16, isAdmin bool,
-	creatorID int16, isPublic bool,
-	objectTypeID int16, objectID uuid.UUID,
-) (bool, error) {
-	if isAdmin {
-		return true, nil
-	}
-	if isPublic {
-		return true, nil
-	}
-	if userID == creatorID {
-		return true, nil
-	}
-	perm, err := s.aclRepo.Get(ctx, userID, objectTypeID, objectID)
-	if err != nil {
-		if errors.Is(err, domain.ErrNotFound) {
-			return false, nil
-		}
-		return false, err
-	}
-	return perm.CanView, nil
-}
-
-// CanEdit returns true if the user may edit the object.
-// is_public does not grant edit access; only admins, creators, and explicit grants.
-func (s *ACLService) CanEdit(
-	ctx context.Context,
-	userID int16, isAdmin bool,
-	creatorID int16,
-	objectTypeID int16, objectID uuid.UUID,
-) (bool, error) {
-	if isAdmin {
-		return true, nil
-	}
-	if userID == creatorID {
-		return true, nil
-	}
-	perm, err := s.aclRepo.Get(ctx, userID, objectTypeID, objectID)
-	if err != nil {
-		if errors.Is(err, domain.ErrNotFound) {
-			return false, nil
-		}
-		return false, err
-	}
-	return perm.CanEdit, nil
-}
-
-// GetPermissions returns all explicit ACL entries for an object.
-func (s *ACLService) GetPermissions(ctx context.Context, objectTypeID int16, objectID uuid.UUID) ([]domain.Permission, error) {
-	return s.aclRepo.List(ctx, objectTypeID, objectID)
-}
-
-// SetPermissions replaces all ACL entries for an object (full replace semantics).
-func (s *ACLService) SetPermissions(ctx context.Context, objectTypeID int16, objectID uuid.UUID, perms []domain.Permission) error {
-	return s.aclRepo.Set(ctx, objectTypeID, objectID, perms)
-}
--- a/backend/internal/service/audit_service.go
+++ b/backend/internal/service/audit_service.go
@ -1,57 +0,0 @@
-package service
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// AuditService records user actions to the audit trail.
-type AuditService struct {
-	repo port.AuditRepo
-}
-
-func NewAuditService(repo port.AuditRepo) *AuditService {
-	return &AuditService{repo: repo}
-}
-
-// Log records an action performed by the user in ctx.
-// objectType and objectID are optional — pass nil when the action has no target object.
-// details can be any JSON-serializable value, or nil.
-func (s *AuditService) Log(
-	ctx context.Context,
-	action string,
-	objectType *string,
-	objectID *uuid.UUID,
-	details any,
-) error {
-	userID, _, _ := domain.UserFromContext(ctx)
-
-	var raw json.RawMessage
-	if details != nil {
-		b, err := json.Marshal(details)
-		if err != nil {
-			return fmt.Errorf("AuditService.Log marshal details: %w", err)
-		}
-		raw = b
-	}
-
-	entry := domain.AuditEntry{
-		UserID:     userID,
-		Action:     action,
-		ObjectType: objectType,
-		ObjectID:   objectID,
-		Details:    raw,
-	}
-	return s.repo.Log(ctx, entry)
-}
-
-// Query returns a filtered, paginated page of audit log entries.
-func (s *AuditService) Query(ctx context.Context, filter domain.AuditFilter) (*domain.AuditPage, error) {
-	return s.repo.List(ctx, filter)
-}
--- a/backend/internal/service/auth_service.go
+++ b/backend/internal/service/auth_service.go
@ -1,282 +0,0 @@
-package service
-
-import (
-	"context"
-	"crypto/sha256"
-	"encoding/hex"
-	"fmt"
-	"time"
-
-	"github.com/golang-jwt/jwt/v5"
-	"golang.org/x/crypto/bcrypt"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// Claims is the JWT payload for both access and refresh tokens.
-type Claims struct {
-	jwt.RegisteredClaims
-	UserID    int16 `json:"uid"`
-	IsAdmin   bool  `json:"adm"`
-	SessionID int   `json:"sid"`
-}
-
-// TokenPair holds an issued access/refresh token pair with the access TTL.
-type TokenPair struct {
-	AccessToken  string
-	RefreshToken string
-	ExpiresIn    int // access token TTL in seconds
-}
-
-// AuthService handles authentication and session lifecycle.
-type AuthService struct {
-	users    port.UserRepo
-	sessions port.SessionRepo
-	secret   []byte
-	accessTTL  time.Duration
-	refreshTTL time.Duration
-}
-
-// NewAuthService creates an AuthService.
-func NewAuthService(
-	users port.UserRepo,
-	sessions port.SessionRepo,
-	jwtSecret string,
-	accessTTL time.Duration,
-	refreshTTL time.Duration,
-) *AuthService {
-	return &AuthService{
-		users:      users,
-		sessions:   sessions,
-		secret:     []byte(jwtSecret),
-		accessTTL:  accessTTL,
-		refreshTTL: refreshTTL,
-	}
-}
-
-// Login validates credentials, creates a session, and returns a token pair.
-func (s *AuthService) Login(ctx context.Context, name, password, userAgent string) (*TokenPair, error) {
-	user, err := s.users.GetByName(ctx, name)
-	if err != nil {
-		// Return ErrUnauthorized regardless of whether the user exists,
-		// to avoid username enumeration.
-		return nil, domain.ErrUnauthorized
-	}
-
-	if user.IsBlocked {
-		return nil, domain.ErrForbidden
-	}
-
-	if err := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(password)); err != nil {
-		return nil, domain.ErrUnauthorized
-	}
-
-	var expiresAt *time.Time
-	if s.refreshTTL > 0 {
-		t := time.Now().Add(s.refreshTTL)
-		expiresAt = &t
-	}
-
-	// Issue the refresh token first so we can store its hash.
-	refreshToken, err := s.issueToken(user.ID, user.IsAdmin, 0, s.refreshTTL)
-	if err != nil {
-		return nil, fmt.Errorf("issue refresh token: %w", err)
-	}
-
-	session, err := s.sessions.Create(ctx, &domain.Session{
-		TokenHash: hashToken(refreshToken),
-		UserID:    user.ID,
-		UserAgent: userAgent,
-		ExpiresAt: expiresAt,
-	})
-	if err != nil {
-		return nil, fmt.Errorf("create session: %w", err)
-	}
-
-	accessToken, err := s.issueToken(user.ID, user.IsAdmin, session.ID, s.accessTTL)
-	if err != nil {
-		return nil, fmt.Errorf("issue access token: %w", err)
-	}
-
-	// Re-issue the refresh token with the real session ID now that we have it.
-	refreshToken, err = s.issueToken(user.ID, user.IsAdmin, session.ID, s.refreshTTL)
-	if err != nil {
-		return nil, fmt.Errorf("issue refresh token: %w", err)
-	}
-
-	return &TokenPair{
-		AccessToken:  accessToken,
-		RefreshToken: refreshToken,
-		ExpiresIn:    int(s.accessTTL.Seconds()),
-	}, nil
-}
-
-// Logout deactivates the session identified by sessionID.
-func (s *AuthService) Logout(ctx context.Context, sessionID int) error {
-	if err := s.sessions.Delete(ctx, sessionID); err != nil {
-		return fmt.Errorf("logout: %w", err)
-	}
-	return nil
-}
-
-// Refresh validates a refresh token, issues a new token pair, and deactivates
-// the old session.
-func (s *AuthService) Refresh(ctx context.Context, refreshToken, userAgent string) (*TokenPair, error) {
-	claims, err := s.parseToken(refreshToken)
-	if err != nil {
-		return nil, domain.ErrUnauthorized
-	}
-
-	session, err := s.sessions.GetByTokenHash(ctx, hashToken(refreshToken))
-	if err != nil {
-		return nil, domain.ErrUnauthorized
-	}
-
-	if session.ExpiresAt != nil && time.Now().After(*session.ExpiresAt) {
-		_ = s.sessions.Delete(ctx, session.ID)
-		return nil, domain.ErrUnauthorized
-	}
-
-	// Rotate: deactivate old session.
-	if err := s.sessions.Delete(ctx, session.ID); err != nil {
-		return nil, fmt.Errorf("deactivate old session: %w", err)
-	}
-
-	user, err := s.users.GetByID(ctx, claims.UserID)
-	if err != nil {
-		return nil, domain.ErrUnauthorized
-	}
-
-	if user.IsBlocked {
-		return nil, domain.ErrForbidden
-	}
-
-	var expiresAt *time.Time
-	if s.refreshTTL > 0 {
-		t := time.Now().Add(s.refreshTTL)
-		expiresAt = &t
-	}
-
-	newRefresh, err := s.issueToken(user.ID, user.IsAdmin, 0, s.refreshTTL)
-	if err != nil {
-		return nil, fmt.Errorf("issue refresh token: %w", err)
-	}
-
-	newSession, err := s.sessions.Create(ctx, &domain.Session{
-		TokenHash: hashToken(newRefresh),
-		UserID:    user.ID,
-		UserAgent: userAgent,
-		ExpiresAt: expiresAt,
-	})
-	if err != nil {
-		return nil, fmt.Errorf("create session: %w", err)
-	}
-
-	accessToken, err := s.issueToken(user.ID, user.IsAdmin, newSession.ID, s.accessTTL)
-	if err != nil {
-		return nil, fmt.Errorf("issue access token: %w", err)
-	}
-
-	newRefresh, err = s.issueToken(user.ID, user.IsAdmin, newSession.ID, s.refreshTTL)
-	if err != nil {
-		return nil, fmt.Errorf("issue refresh token: %w", err)
-	}
-
-	return &TokenPair{
-		AccessToken:  accessToken,
-		RefreshToken: newRefresh,
-		ExpiresIn:    int(s.accessTTL.Seconds()),
-	}, nil
-}
-
-// ListSessions returns all active sessions for the given user.
-func (s *AuthService) ListSessions(ctx context.Context, userID int16, currentSessionID int) (*domain.SessionList, error) {
-	list, err := s.sessions.ListByUser(ctx, userID)
-	if err != nil {
-		return nil, fmt.Errorf("list sessions: %w", err)
-	}
-	for i := range list.Items {
-		list.Items[i].IsCurrent = list.Items[i].ID == currentSessionID
-	}
-	return list, nil
-}
-
-// TerminateSession deactivates a specific session, enforcing ownership.
-func (s *AuthService) TerminateSession(ctx context.Context, callerID int16, isAdmin bool, sessionID int) error {
-	if !isAdmin {
-		list, err := s.sessions.ListByUser(ctx, callerID)
-		if err != nil {
-			return fmt.Errorf("terminate session: %w", err)
-		}
-		owned := false
-		for _, sess := range list.Items {
-			if sess.ID == sessionID {
-				owned = true
-				break
-			}
-		}
-		if !owned {
-			return domain.ErrForbidden
-		}
-	}
-
-	if err := s.sessions.Delete(ctx, sessionID); err != nil {
-		return fmt.Errorf("terminate session: %w", err)
-	}
-	return nil
-}
-
-// ParseAccessToken parses and validates an access token, returning its claims.
-func (s *AuthService) ParseAccessToken(tokenStr string) (*Claims, error) {
-	claims, err := s.parseToken(tokenStr)
-	if err != nil {
-		return nil, domain.ErrUnauthorized
-	}
-	return claims, nil
-}
-
-// issueToken signs a JWT with the given parameters.
-func (s *AuthService) issueToken(userID int16, isAdmin bool, sessionID int, ttl time.Duration) (string, error) {
-	now := time.Now()
-	claims := Claims{
-		RegisteredClaims: jwt.RegisteredClaims{
-			IssuedAt:  jwt.NewNumericDate(now),
-			ExpiresAt: jwt.NewNumericDate(now.Add(ttl)),
-		},
-		UserID:    userID,
-		IsAdmin:   isAdmin,
-		SessionID: sessionID,
-	}
-	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
-	signed, err := token.SignedString(s.secret)
-	if err != nil {
-		return "", fmt.Errorf("sign token: %w", err)
-	}
-	return signed, nil
-}
-
-// parseToken verifies the signature and parses claims from a token string.
-func (s *AuthService) parseToken(tokenStr string) (*Claims, error) {
-	token, err := jwt.ParseWithClaims(tokenStr, &Claims{}, func(t *jwt.Token) (any, error) {
-		if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
-			return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
-		}
-		return s.secret, nil
-	})
-	if err != nil || !token.Valid {
-		return nil, domain.ErrUnauthorized
-	}
-	claims, ok := token.Claims.(*Claims)
-	if !ok {
-		return nil, domain.ErrUnauthorized
-	}
-	return claims, nil
-}
-
-// hashToken returns the SHA-256 hex digest of a token string.
-// The raw token is never stored; only the hash goes to the database.
-func hashToken(token string) string {
-	sum := sha256.Sum256([]byte(token))
-	return hex.EncodeToString(sum[:])
-}
--- a/backend/internal/service/category_service.go
+++ b/backend/internal/service/category_service.go
@ -1,164 +0,0 @@
-package service
-
-import (
-	"context"
-	"encoding/json"
-
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-const categoryObjectType          = "category"
-const categoryObjectTypeID int16  = 3 // third row in 007_seed_data.sql object_types
-
-// CategoryParams holds the fields for creating or patching a category.
-type CategoryParams struct {
-	Name     string
-	Notes    *string
-	Color    *string         // nil = no change; pointer to empty string = clear
-	Metadata json.RawMessage
-	IsPublic *bool
-}
-
-// CategoryService handles category CRUD with ACL enforcement and audit logging.
-type CategoryService struct {
-	categories port.CategoryRepo
-	tags       port.TagRepo
-	acl        *ACLService
-	audit      *AuditService
-}
-
-// NewCategoryService creates a CategoryService.
-func NewCategoryService(
-	categories port.CategoryRepo,
-	tags port.TagRepo,
-	acl *ACLService,
-	audit *AuditService,
-) *CategoryService {
-	return &CategoryService{
-		categories: categories,
-		tags:       tags,
-		acl:        acl,
-		audit:      audit,
-	}
-}
-
-// ---------------------------------------------------------------------------
-// CRUD
-// ---------------------------------------------------------------------------
-
-// List returns a paginated, optionally filtered list of categories.
-func (s *CategoryService) List(ctx context.Context, params port.OffsetParams) (*domain.CategoryOffsetPage, error) {
-	return s.categories.List(ctx, params)
-}
-
-// Get returns a category by ID.
-func (s *CategoryService) Get(ctx context.Context, id uuid.UUID) (*domain.Category, error) {
-	return s.categories.GetByID(ctx, id)
-}
-
-// Create inserts a new category record.
-func (s *CategoryService) Create(ctx context.Context, p CategoryParams) (*domain.Category, error) {
-	userID, _, _ := domain.UserFromContext(ctx)
-
-	c := &domain.Category{
-		Name:      p.Name,
-		Notes:     p.Notes,
-		Color:     p.Color,
-		Metadata:  p.Metadata,
-		CreatorID: userID,
-	}
-	if p.IsPublic != nil {
-		c.IsPublic = *p.IsPublic
-	}
-
-	created, err := s.categories.Create(ctx, c)
-	if err != nil {
-		return nil, err
-	}
-
-	objType := categoryObjectType
-	_ = s.audit.Log(ctx, "category_create", &objType, &created.ID, nil)
-	return created, nil
-}
-
-// Update applies a partial patch to a category.
-func (s *CategoryService) Update(ctx context.Context, id uuid.UUID, p CategoryParams) (*domain.Category, error) {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	current, err := s.categories.GetByID(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-
-	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, current.CreatorID, categoryObjectTypeID, id)
-	if err != nil {
-		return nil, err
-	}
-	if !ok {
-		return nil, domain.ErrForbidden
-	}
-
-	patch := *current
-	if p.Name != "" {
-		patch.Name = p.Name
-	}
-	if p.Notes != nil {
-		patch.Notes = p.Notes
-	}
-	if p.Color != nil {
-		patch.Color = p.Color
-	}
-	if len(p.Metadata) > 0 {
-		patch.Metadata = p.Metadata
-	}
-	if p.IsPublic != nil {
-		patch.IsPublic = *p.IsPublic
-	}
-
-	updated, err := s.categories.Update(ctx, id, &patch)
-	if err != nil {
-		return nil, err
-	}
-
-	objType := categoryObjectType
-	_ = s.audit.Log(ctx, "category_edit", &objType, &id, nil)
-	return updated, nil
-}
-
-// Delete removes a category by ID, enforcing edit ACL.
-func (s *CategoryService) Delete(ctx context.Context, id uuid.UUID) error {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	c, err := s.categories.GetByID(ctx, id)
-	if err != nil {
-		return err
-	}
-
-	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, c.CreatorID, categoryObjectTypeID, id)
-	if err != nil {
-		return err
-	}
-	if !ok {
-		return domain.ErrForbidden
-	}
-
-	if err := s.categories.Delete(ctx, id); err != nil {
-		return err
-	}
-
-	objType := categoryObjectType
-	_ = s.audit.Log(ctx, "category_delete", &objType, &id, nil)
-	return nil
-}
-
-// ---------------------------------------------------------------------------
-// Tags in category
-// ---------------------------------------------------------------------------
-
-// ListTags returns a paginated list of tags belonging to this category.
-func (s *CategoryService) ListTags(ctx context.Context, categoryID uuid.UUID, params port.OffsetParams) (*domain.TagOffsetPage, error) {
-	return s.tags.ListByCategory(ctx, categoryID, params)
-}
--- a/backend/internal/service/file_service.go
+++ b/backend/internal/service/file_service.go
@ -1,569 +0,0 @@
-package service
-
-import (
-	"bytes"
-	"context"
-	"encoding/json"
-	"fmt"
-	"io"
-	"os"
-	"path/filepath"
-	"time"
-
-	"github.com/gabriel-vasile/mimetype"
-	"github.com/google/uuid"
-	"github.com/rwcarlsen/goexif/exif"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-const fileObjectType = "file"
-
-// fileObjectTypeID is the primary key of the "file" row in core.object_types.
-// It matches the first value inserted in 007_seed_data.sql.
-const fileObjectTypeID int16 = 1
-
-// UploadParams holds the parameters for uploading a new file.
-type UploadParams struct {
-	Reader          io.Reader
-	MIMEType        string
-	OriginalName    *string
-	Notes           *string
-	Metadata        json.RawMessage
-	ContentDatetime *time.Time
-	IsPublic        bool
-	TagIDs          []uuid.UUID
-}
-
-// UpdateParams holds the parameters for updating file metadata.
-type UpdateParams struct {
-	OriginalName    *string
-	Notes           *string
-	Metadata        json.RawMessage
-	ContentDatetime *time.Time
-	IsPublic        *bool
-	TagIDs          *[]uuid.UUID // nil means don't change tags
-}
-
-// ContentResult holds the open reader and metadata for a file download.
-type ContentResult struct {
-	Body         io.ReadCloser
-	MIMEType     string
-	OriginalName *string
-}
-
-// ImportFileError records a failed file during an import operation.
-type ImportFileError struct {
-	Filename string `json:"filename"`
-	Reason   string `json:"reason"`
-}
-
-// ImportResult summarises a directory import.
-type ImportResult struct {
-	Imported int               `json:"imported"`
-	Skipped  int               `json:"skipped"`
-	Errors   []ImportFileError `json:"errors"`
-}
-
-// FileService handles business logic for file records.
-type FileService struct {
-	files      port.FileRepo
-	mimes      port.MimeRepo
-	storage    port.FileStorage
-	acl        *ACLService
-	audit      *AuditService
-	tags       *TagService
-	tx         port.Transactor
-	importPath string // default server-side import directory
-}
-
-// NewFileService creates a FileService.
-func NewFileService(
-	files port.FileRepo,
-	mimes port.MimeRepo,
-	storage port.FileStorage,
-	acl *ACLService,
-	audit *AuditService,
-	tags *TagService,
-	tx port.Transactor,
-	importPath string,
-) *FileService {
-	return &FileService{
-		files:      files,
-		mimes:      mimes,
-		storage:    storage,
-		acl:        acl,
-		audit:      audit,
-		tags:       tags,
-		tx:         tx,
-		importPath: importPath,
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Core CRUD
-// ---------------------------------------------------------------------------
-
-// Upload validates the MIME type, saves the file to storage, creates the DB
-// record, and applies any initial tags — all within a single transaction.
-// If ContentDatetime is nil and EXIF DateTimeOriginal is present, it is used.
-func (s *FileService) Upload(ctx context.Context, p UploadParams) (*domain.File, error) {
-	userID, _, _ := domain.UserFromContext(ctx)
-
-	// Validate MIME type against the whitelist.
-	mime, err := s.mimes.GetByName(ctx, p.MIMEType)
-	if err != nil {
-		return nil, err // ErrUnsupportedMIME or DB error
-	}
-
-	// Buffer the upload so we can extract EXIF without re-reading storage.
-	var buf bytes.Buffer
-	if _, err := io.Copy(&buf, p.Reader); err != nil {
-		return nil, fmt.Errorf("FileService.Upload: read body: %w", err)
-	}
-	data := buf.Bytes()
-
-	// Extract EXIF metadata (best-effort; non-image files will error silently).
-	exifData, exifDatetime := extractEXIFWithDatetime(data)
-
-	// Resolve content datetime: explicit > EXIF > zero value.
-	var contentDatetime time.Time
-	if p.ContentDatetime != nil {
-		contentDatetime = *p.ContentDatetime
-	} else if exifDatetime != nil {
-		contentDatetime = *exifDatetime
-	}
-
-	// Assign UUID v7 so CreatedAt can be derived from it later.
-	fileID, err := uuid.NewV7()
-	if err != nil {
-		return nil, fmt.Errorf("FileService.Upload: generate UUID: %w", err)
-	}
-
-	// Save file bytes to disk before opening the transaction so that a disk
-	// failure does not abort an otherwise healthy DB transaction.
-	if _, err := s.storage.Save(ctx, fileID, bytes.NewReader(data)); err != nil {
-		return nil, fmt.Errorf("FileService.Upload: save to storage: %w", err)
-	}
-
-	var created *domain.File
-	txErr := s.tx.WithTx(ctx, func(ctx context.Context) error {
-		f := &domain.File{
-			ID:              fileID,
-			OriginalName:    p.OriginalName,
-			MIMEType:        mime.Name,
-			MIMEExtension:   mime.Extension,
-			ContentDatetime: contentDatetime,
-			Notes:           p.Notes,
-			Metadata:        p.Metadata,
-			EXIF:            exifData,
-			CreatorID:       userID,
-			IsPublic:        p.IsPublic,
-		}
-
-		var createErr error
-		created, createErr = s.files.Create(ctx, f)
-		if createErr != nil {
-			return createErr
-		}
-
-		if len(p.TagIDs) > 0 {
-			tags, err := s.tags.SetFileTags(ctx, created.ID, p.TagIDs)
-			if err != nil {
-				return err
-			}
-			created.Tags = tags
-		}
-		return nil
-	})
-	if txErr != nil {
-		// Attempt to clean up the orphaned file; ignore cleanup errors.
-		_ = s.storage.Delete(ctx, fileID)
-		return nil, txErr
-	}
-
-	objType := fileObjectType
-	_ = s.audit.Log(ctx, "file_create", &objType, &created.ID, nil)
-	return created, nil
-}
-
-// Get returns a file by ID, enforcing view ACL.
-func (s *FileService) Get(ctx context.Context, id uuid.UUID) (*domain.File, error) {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	f, err := s.files.GetByID(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-
-	ok, err := s.acl.CanView(ctx, userID, isAdmin, f.CreatorID, f.IsPublic, fileObjectTypeID, id)
-	if err != nil {
-		return nil, err
-	}
-	if !ok {
-		return nil, domain.ErrForbidden
-	}
-	return f, nil
-}
-
-// Update applies metadata changes to a file, enforcing edit ACL.
-func (s *FileService) Update(ctx context.Context, id uuid.UUID, p UpdateParams) (*domain.File, error) {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	f, err := s.files.GetByID(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-
-	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, f.CreatorID, fileObjectTypeID, id)
-	if err != nil {
-		return nil, err
-	}
-	if !ok {
-		return nil, domain.ErrForbidden
-	}
-
-	patch := &domain.File{}
-	if p.OriginalName != nil {
-		patch.OriginalName = p.OriginalName
-	}
-	if p.Notes != nil {
-		patch.Notes = p.Notes
-	}
-	if p.Metadata != nil {
-		patch.Metadata = p.Metadata
-	}
-	if p.ContentDatetime != nil {
-		patch.ContentDatetime = *p.ContentDatetime
-	}
-	if p.IsPublic != nil {
-		patch.IsPublic = *p.IsPublic
-	}
-
-	var updated *domain.File
-	txErr := s.tx.WithTx(ctx, func(ctx context.Context) error {
-		var updateErr error
-		updated, updateErr = s.files.Update(ctx, id, patch)
-		if updateErr != nil {
-			return updateErr
-		}
-		if p.TagIDs != nil {
-			tags, err := s.tags.SetFileTags(ctx, id, *p.TagIDs)
-			if err != nil {
-				return err
-			}
-			updated.Tags = tags
-		}
-		return nil
-	})
-	if txErr != nil {
-		return nil, txErr
-	}
-
-	objType := fileObjectType
-	_ = s.audit.Log(ctx, "file_edit", &objType, &id, nil)
-	return updated, nil
-}
-
-// Delete soft-deletes a file (moves to trash), enforcing edit ACL.
-func (s *FileService) Delete(ctx context.Context, id uuid.UUID) error {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	f, err := s.files.GetByID(ctx, id)
-	if err != nil {
-		return err
-	}
-
-	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, f.CreatorID, fileObjectTypeID, id)
-	if err != nil {
-		return err
-	}
-	if !ok {
-		return domain.ErrForbidden
-	}
-
-	if err := s.files.SoftDelete(ctx, id); err != nil {
-		return err
-	}
-
-	objType := fileObjectType
-	_ = s.audit.Log(ctx, "file_delete", &objType, &id, nil)
-	return nil
-}
-
-// Restore moves a soft-deleted file out of trash, enforcing edit ACL.
-func (s *FileService) Restore(ctx context.Context, id uuid.UUID) (*domain.File, error) {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	f, err := s.files.GetByID(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-
-	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, f.CreatorID, fileObjectTypeID, id)
-	if err != nil {
-		return nil, err
-	}
-	if !ok {
-		return nil, domain.ErrForbidden
-	}
-
-	restored, err := s.files.Restore(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-
-	objType := fileObjectType
-	_ = s.audit.Log(ctx, "file_restore", &objType, &id, nil)
-	return restored, nil
-}
-
-// PermanentDelete removes the file record and its stored bytes. Only allowed
-// when the file is already in trash.
-func (s *FileService) PermanentDelete(ctx context.Context, id uuid.UUID) error {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	f, err := s.files.GetByID(ctx, id)
-	if err != nil {
-		return err
-	}
-	if !f.IsDeleted {
-		return domain.ErrConflict
-	}
-
-	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, f.CreatorID, fileObjectTypeID, id)
-	if err != nil {
-		return err
-	}
-	if !ok {
-		return domain.ErrForbidden
-	}
-
-	if err := s.files.DeletePermanent(ctx, id); err != nil {
-		return err
-	}
-	_ = s.storage.Delete(ctx, id)
-
-	objType := fileObjectType
-	_ = s.audit.Log(ctx, "file_permanent_delete", &objType, &id, nil)
-	return nil
-}
-
-// Replace swaps the stored bytes for a file with new content.
-func (s *FileService) Replace(ctx context.Context, id uuid.UUID, p UploadParams) (*domain.File, error) {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	f, err := s.files.GetByID(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-
-	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, f.CreatorID, fileObjectTypeID, id)
-	if err != nil {
-		return nil, err
-	}
-	if !ok {
-		return nil, domain.ErrForbidden
-	}
-
-	mime, err := s.mimes.GetByName(ctx, p.MIMEType)
-	if err != nil {
-		return nil, err
-	}
-
-	var buf bytes.Buffer
-	if _, err := io.Copy(&buf, p.Reader); err != nil {
-		return nil, fmt.Errorf("FileService.Replace: read body: %w", err)
-	}
-	data := buf.Bytes()
-	exifData, _ := extractEXIFWithDatetime(data)
-
-	if _, err := s.storage.Save(ctx, id, bytes.NewReader(data)); err != nil {
-		return nil, fmt.Errorf("FileService.Replace: save to storage: %w", err)
-	}
-
-	patch := &domain.File{
-		MIMEType:      mime.Name,
-		MIMEExtension: mime.Extension,
-		EXIF:          exifData,
-	}
-	if p.OriginalName != nil {
-		patch.OriginalName = p.OriginalName
-	}
-
-	updated, err := s.files.Update(ctx, id, patch)
-	if err != nil {
-		return nil, err
-	}
-
-	objType := fileObjectType
-	_ = s.audit.Log(ctx, "file_replace", &objType, &id, nil)
-	return updated, nil
-}
-
-// List delegates to FileRepo with the given params.
-func (s *FileService) List(ctx context.Context, params domain.FileListParams) (*domain.FilePage, error) {
-	return s.files.List(ctx, params)
-}
-
-// ---------------------------------------------------------------------------
-// Content / thumbnail / preview streaming
-// ---------------------------------------------------------------------------
-
-// GetContent opens the raw file for download, enforcing view ACL.
-func (s *FileService) GetContent(ctx context.Context, id uuid.UUID) (*ContentResult, error) {
-	f, err := s.Get(ctx, id) // ACL checked inside Get
-	if err != nil {
-		return nil, err
-	}
-	rc, err := s.storage.Read(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-	return &ContentResult{
-		Body:         rc,
-		MIMEType:     f.MIMEType,
-		OriginalName: f.OriginalName,
-	}, nil
-}
-
-// GetThumbnail returns the thumbnail JPEG, enforcing view ACL.
-func (s *FileService) GetThumbnail(ctx context.Context, id uuid.UUID) (io.ReadCloser, error) {
-	if _, err := s.Get(ctx, id); err != nil {
-		return nil, err
-	}
-	return s.storage.Thumbnail(ctx, id)
-}
-
-// GetPreview returns the preview JPEG, enforcing view ACL.
-func (s *FileService) GetPreview(ctx context.Context, id uuid.UUID) (io.ReadCloser, error) {
-	if _, err := s.Get(ctx, id); err != nil {
-		return nil, err
-	}
-	return s.storage.Preview(ctx, id)
-}
-
-// ---------------------------------------------------------------------------
-// Bulk operations
-// ---------------------------------------------------------------------------
-
-// BulkDelete soft-deletes multiple files. Files the caller cannot edit are silently skipped.
-func (s *FileService) BulkDelete(ctx context.Context, fileIDs []uuid.UUID) error {
-	for _, id := range fileIDs {
-		if err := s.Delete(ctx, id); err != nil {
-			if err == domain.ErrNotFound || err == domain.ErrForbidden {
-				continue
-			}
-			return err
-		}
-	}
-	return nil
-}
-
-// ---------------------------------------------------------------------------
-// Import
-// ---------------------------------------------------------------------------
-
-// Import scans a server-side directory and uploads all supported files.
-// If path is empty, the configured default import path is used.
-func (s *FileService) Import(ctx context.Context, path string) (*ImportResult, error) {
-	dir := path
-	if dir == "" {
-		dir = s.importPath
-	}
-	if dir == "" {
-		return nil, domain.ErrValidation
-	}
-
-	entries, err := os.ReadDir(dir)
-	if err != nil {
-		return nil, fmt.Errorf("FileService.Import: read dir %q: %w", dir, err)
-	}
-
-	result := &ImportResult{Errors: []ImportFileError{}}
-
-	for _, entry := range entries {
-		if entry.IsDir() {
-			result.Skipped++
-			continue
-		}
-
-		fullPath := filepath.Join(dir, entry.Name())
-
-		mt, err := mimetype.DetectFile(fullPath)
-		if err != nil {
-			result.Errors = append(result.Errors, ImportFileError{
-				Filename: entry.Name(),
-				Reason:   fmt.Sprintf("MIME detection failed: %s", err),
-			})
-			continue
-		}
-
-		mimeStr := mt.String()
-		// Strip parameters (e.g. "text/plain; charset=utf-8" → "text/plain").
-		if idx := len(mimeStr); idx > 0 {
-			for i, c := range mimeStr {
-				if c == ';' {
-					mimeStr = mimeStr[:i]
-					break
-				}
-			}
-		}
-
-		if _, err := s.mimes.GetByName(ctx, mimeStr); err != nil {
-			result.Skipped++
-			continue
-		}
-
-		f, err := os.Open(fullPath)
-		if err != nil {
-			result.Errors = append(result.Errors, ImportFileError{
-				Filename: entry.Name(),
-				Reason:   fmt.Sprintf("open failed: %s", err),
-			})
-			continue
-		}
-
-		name := entry.Name()
-		_, uploadErr := s.Upload(ctx, UploadParams{
-			Reader:       f,
-			MIMEType:     mimeStr,
-			OriginalName: &name,
-		})
-		f.Close()
-
-		if uploadErr != nil {
-			result.Errors = append(result.Errors, ImportFileError{
-				Filename: entry.Name(),
-				Reason:   uploadErr.Error(),
-			})
-			continue
-		}
-		result.Imported++
-	}
-
-	return result, nil
-}
-
-// ---------------------------------------------------------------------------
-// Internal helpers
-// ---------------------------------------------------------------------------
-
-// extractEXIFWithDatetime parses EXIF from raw bytes, returning both the JSON
-// representation and the DateTimeOriginal (if present). Both may be nil.
-func extractEXIFWithDatetime(data []byte) (json.RawMessage, *time.Time) {
-	x, err := exif.Decode(bytes.NewReader(data))
-	if err != nil {
-		return nil, nil
-	}
-	b, err := x.MarshalJSON()
-	if err != nil {
-		return nil, nil
-	}
-	var dt *time.Time
-	if t, err := x.DateTime(); err == nil {
-		dt = &t
-	}
-	return json.RawMessage(b), dt
-}
--- a/backend/internal/service/pool_service.go
+++ b/backend/internal/service/pool_service.go
@ -1,177 +0,0 @@
-package service
-
-import (
-	"context"
-	"encoding/json"
-
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-const poolObjectType         = "pool"
-const poolObjectTypeID int16 = 4 // fourth row in 007_seed_data.sql object_types
-
-// PoolParams holds the fields for creating or patching a pool.
-type PoolParams struct {
-	Name     string
-	Notes    *string
-	Metadata json.RawMessage
-	IsPublic *bool
-}
-
-// PoolService handles pool CRUD and pool–file management with ACL + audit.
-type PoolService struct {
-	pools port.PoolRepo
-	acl   *ACLService
-	audit *AuditService
-}
-
-// NewPoolService creates a PoolService.
-func NewPoolService(
-	pools port.PoolRepo,
-	acl *ACLService,
-	audit *AuditService,
-) *PoolService {
-	return &PoolService{pools: pools, acl: acl, audit: audit}
-}
-
-// ---------------------------------------------------------------------------
-// CRUD
-// ---------------------------------------------------------------------------
-
-// List returns a paginated list of pools.
-func (s *PoolService) List(ctx context.Context, params port.OffsetParams) (*domain.PoolOffsetPage, error) {
-	return s.pools.List(ctx, params)
-}
-
-// Get returns a pool by ID.
-func (s *PoolService) Get(ctx context.Context, id uuid.UUID) (*domain.Pool, error) {
-	return s.pools.GetByID(ctx, id)
-}
-
-// Create inserts a new pool.
-func (s *PoolService) Create(ctx context.Context, p PoolParams) (*domain.Pool, error) {
-	userID, _, _ := domain.UserFromContext(ctx)
-
-	pool := &domain.Pool{
-		Name:      p.Name,
-		Notes:     p.Notes,
-		Metadata:  p.Metadata,
-		CreatorID: userID,
-	}
-	if p.IsPublic != nil {
-		pool.IsPublic = *p.IsPublic
-	}
-
-	created, err := s.pools.Create(ctx, pool)
-	if err != nil {
-		return nil, err
-	}
-
-	objType := poolObjectType
-	_ = s.audit.Log(ctx, "pool_create", &objType, &created.ID, nil)
-	return created, nil
-}
-
-// Update applies a partial patch to a pool.
-func (s *PoolService) Update(ctx context.Context, id uuid.UUID, p PoolParams) (*domain.Pool, error) {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	current, err := s.pools.GetByID(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-
-	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, current.CreatorID, poolObjectTypeID, id)
-	if err != nil {
-		return nil, err
-	}
-	if !ok {
-		return nil, domain.ErrForbidden
-	}
-
-	patch := *current
-	if p.Name != "" {
-		patch.Name = p.Name
-	}
-	if p.Notes != nil {
-		patch.Notes = p.Notes
-	}
-	if len(p.Metadata) > 0 {
-		patch.Metadata = p.Metadata
-	}
-	if p.IsPublic != nil {
-		patch.IsPublic = *p.IsPublic
-	}
-
-	updated, err := s.pools.Update(ctx, id, &patch)
-	if err != nil {
-		return nil, err
-	}
-
-	objType := poolObjectType
-	_ = s.audit.Log(ctx, "pool_edit", &objType, &id, nil)
-	return updated, nil
-}
-
-// Delete removes a pool by ID, enforcing edit ACL.
-func (s *PoolService) Delete(ctx context.Context, id uuid.UUID) error {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	pool, err := s.pools.GetByID(ctx, id)
-	if err != nil {
-		return err
-	}
-
-	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, pool.CreatorID, poolObjectTypeID, id)
-	if err != nil {
-		return err
-	}
-	if !ok {
-		return domain.ErrForbidden
-	}
-
-	if err := s.pools.Delete(ctx, id); err != nil {
-		return err
-	}
-
-	objType := poolObjectType
-	_ = s.audit.Log(ctx, "pool_delete", &objType, &id, nil)
-	return nil
-}
-
-// ---------------------------------------------------------------------------
-// Pool–file operations
-// ---------------------------------------------------------------------------
-
-// ListFiles returns cursor-paginated files within a pool ordered by position.
-func (s *PoolService) ListFiles(ctx context.Context, poolID uuid.UUID, params port.PoolFileListParams) (*domain.PoolFilePage, error) {
-	return s.pools.ListFiles(ctx, poolID, params)
-}
-
-// AddFiles adds files to a pool at the given position (nil = append).
-func (s *PoolService) AddFiles(ctx context.Context, poolID uuid.UUID, fileIDs []uuid.UUID, position *int) error {
-	if err := s.pools.AddFiles(ctx, poolID, fileIDs, position); err != nil {
-		return err
-	}
-	objType := poolObjectType
-	_ = s.audit.Log(ctx, "file_pool_add", &objType, &poolID, map[string]any{"count": len(fileIDs)})
-	return nil
-}
-
-// RemoveFiles removes files from a pool.
-func (s *PoolService) RemoveFiles(ctx context.Context, poolID uuid.UUID, fileIDs []uuid.UUID) error {
-	if err := s.pools.RemoveFiles(ctx, poolID, fileIDs); err != nil {
-		return err
-	}
-	objType := poolObjectType
-	_ = s.audit.Log(ctx, "file_pool_remove", &objType, &poolID, map[string]any{"count": len(fileIDs)})
-	return nil
-}
-
-// Reorder sets the full ordered sequence of file IDs within a pool.
-func (s *PoolService) Reorder(ctx context.Context, poolID uuid.UUID, fileIDs []uuid.UUID) error {
-	return s.pools.Reorder(ctx, poolID, fileIDs)
-}
--- a/backend/internal/service/tag_service.go
+++ b/backend/internal/service/tag_service.go
@ -1,412 +0,0 @@
-package service
-
-import (
-	"context"
-	"encoding/json"
-
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-const tagObjectType    = "tag"
-const tagObjectTypeID  int16 = 2 // second row in 007_seed_data.sql object_types
-
-// TagParams holds the fields for creating or patching a tag.
-type TagParams struct {
-	Name       string
-	Notes      *string
-	Color      *string          // nil = no change; pointer to empty string = clear
-	CategoryID *uuid.UUID       // nil = no change; Nil UUID = unassign
-	Metadata   json.RawMessage
-	IsPublic   *bool
-}
-
-// TagService handles tag CRUD, tag-rule management, and file–tag operations
-// including automatic recursive rule application.
-type TagService struct {
-	tags  port.TagRepo
-	rules port.TagRuleRepo
-	acl   *ACLService
-	audit *AuditService
-	tx    port.Transactor
-}
-
-// NewTagService creates a TagService.
-func NewTagService(
-	tags port.TagRepo,
-	rules port.TagRuleRepo,
-	acl *ACLService,
-	audit *AuditService,
-	tx port.Transactor,
-) *TagService {
-	return &TagService{
-		tags:  tags,
-		rules: rules,
-		acl:   acl,
-		audit: audit,
-		tx:    tx,
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Tag CRUD
-// ---------------------------------------------------------------------------
-
-// List returns a paginated, optionally filtered list of tags.
-func (s *TagService) List(ctx context.Context, params port.OffsetParams) (*domain.TagOffsetPage, error) {
-	return s.tags.List(ctx, params)
-}
-
-// Get returns a tag by ID.
-func (s *TagService) Get(ctx context.Context, id uuid.UUID) (*domain.Tag, error) {
-	return s.tags.GetByID(ctx, id)
-}
-
-// Create inserts a new tag record.
-func (s *TagService) Create(ctx context.Context, p TagParams) (*domain.Tag, error) {
-	userID, _, _ := domain.UserFromContext(ctx)
-
-	t := &domain.Tag{
-		Name:       p.Name,
-		Notes:      p.Notes,
-		Color:      p.Color,
-		CategoryID: p.CategoryID,
-		Metadata:   p.Metadata,
-		CreatorID:  userID,
-	}
-	if p.IsPublic != nil {
-		t.IsPublic = *p.IsPublic
-	}
-
-	created, err := s.tags.Create(ctx, t)
-	if err != nil {
-		return nil, err
-	}
-
-	objType := tagObjectType
-	_ = s.audit.Log(ctx, "tag_create", &objType, &created.ID, nil)
-	return created, nil
-}
-
-// Update applies a partial patch to a tag.
-// The service reads the current tag first so the caller only needs to supply
-// the fields that should change.
-func (s *TagService) Update(ctx context.Context, id uuid.UUID, p TagParams) (*domain.Tag, error) {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	current, err := s.tags.GetByID(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-
-	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, current.CreatorID, tagObjectTypeID, id)
-	if err != nil {
-		return nil, err
-	}
-	if !ok {
-		return nil, domain.ErrForbidden
-	}
-
-	// Merge patch into current.
-	patch := *current // copy
-	if p.Name != "" {
-		patch.Name = p.Name
-	}
-	if p.Notes != nil {
-		patch.Notes = p.Notes
-	}
-	if p.Color != nil {
-		patch.Color = p.Color
-	}
-	if p.CategoryID != nil {
-		if *p.CategoryID == uuid.Nil {
-			patch.CategoryID = nil // explicit unassign
-		} else {
-			patch.CategoryID = p.CategoryID
-		}
-	}
-	if len(p.Metadata) > 0 {
-		patch.Metadata = p.Metadata
-	}
-	if p.IsPublic != nil {
-		patch.IsPublic = *p.IsPublic
-	}
-
-	updated, err := s.tags.Update(ctx, id, &patch)
-	if err != nil {
-		return nil, err
-	}
-
-	objType := tagObjectType
-	_ = s.audit.Log(ctx, "tag_edit", &objType, &id, nil)
-	return updated, nil
-}
-
-// Delete removes a tag by ID, enforcing edit ACL.
-func (s *TagService) Delete(ctx context.Context, id uuid.UUID) error {
-	userID, isAdmin, _ := domain.UserFromContext(ctx)
-
-	t, err := s.tags.GetByID(ctx, id)
-	if err != nil {
-		return err
-	}
-
-	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, t.CreatorID, tagObjectTypeID, id)
-	if err != nil {
-		return err
-	}
-	if !ok {
-		return domain.ErrForbidden
-	}
-
-	if err := s.tags.Delete(ctx, id); err != nil {
-		return err
-	}
-
-	objType := tagObjectType
-	_ = s.audit.Log(ctx, "tag_delete", &objType, &id, nil)
-	return nil
-}
-
-// ---------------------------------------------------------------------------
-// Tag rules
-// ---------------------------------------------------------------------------
-
-// ListRules returns all rules for a tag (when this tag is applied, these follow).
-func (s *TagService) ListRules(ctx context.Context, tagID uuid.UUID) ([]domain.TagRule, error) {
-	return s.rules.ListByTag(ctx, tagID)
-}
-
-// CreateRule adds a tag rule. If applyToExisting is true, the then_tag is
-// retroactively applied to all files that already carry the when_tag.
-// Retroactive application requires a FileRepo; it is deferred until wired
-// in a future iteration (see port.FileRepo.ListByTag).
-func (s *TagService) CreateRule(ctx context.Context, whenTagID, thenTagID uuid.UUID, isActive, _ bool) (*domain.TagRule, error) {
-	return s.rules.Create(ctx, domain.TagRule{
-		WhenTagID: whenTagID,
-		ThenTagID: thenTagID,
-		IsActive:  isActive,
-	})
-}
-
-// SetRuleActive toggles a rule's is_active flag and returns the updated rule.
-// When active and applyToExisting are both true, the full transitive expansion
-// of thenTagID is retroactively applied to files already carrying whenTagID.
-func (s *TagService) SetRuleActive(ctx context.Context, whenTagID, thenTagID uuid.UUID, active, applyToExisting bool) (*domain.TagRule, error) {
-	if err := s.rules.SetActive(ctx, whenTagID, thenTagID, active, applyToExisting); err != nil {
-		return nil, err
-	}
-	rules, err := s.rules.ListByTag(ctx, whenTagID)
-	if err != nil {
-		return nil, err
-	}
-	for _, r := range rules {
-		if r.ThenTagID == thenTagID {
-			return &r, nil
-		}
-	}
-	return nil, domain.ErrNotFound
-}
-
-// DeleteRule removes a tag rule.
-func (s *TagService) DeleteRule(ctx context.Context, whenTagID, thenTagID uuid.UUID) error {
-	return s.rules.Delete(ctx, whenTagID, thenTagID)
-}
-
-// ---------------------------------------------------------------------------
-// File–tag operations (with auto-rule expansion)
-// ---------------------------------------------------------------------------
-
-// ListFileTags returns the tags on a file.
-func (s *TagService) ListFileTags(ctx context.Context, fileID uuid.UUID) ([]domain.Tag, error) {
-	return s.tags.ListByFile(ctx, fileID)
-}
-
-// SetFileTags replaces all tags on a file, then applies active rules for all
-// newly set tags (BFS expansion). Returns the full resulting tag set.
-func (s *TagService) SetFileTags(ctx context.Context, fileID uuid.UUID, tagIDs []uuid.UUID) ([]domain.Tag, error) {
-	expanded, err := s.expandTagSet(ctx, tagIDs)
-	if err != nil {
-		return nil, err
-	}
-
-	if err := s.tags.SetFileTags(ctx, fileID, expanded); err != nil {
-		return nil, err
-	}
-
-	objType := fileObjectType
-	_ = s.audit.Log(ctx, "file_tag_add", &objType, &fileID, nil)
-	return s.tags.ListByFile(ctx, fileID)
-}
-
-// AddFileTag adds a single tag to a file, then recursively applies active rules.
-// Returns the full resulting tag set.
-func (s *TagService) AddFileTag(ctx context.Context, fileID, tagID uuid.UUID) ([]domain.Tag, error) {
-	// Compute the full set including rule-expansion from tagID.
-	extra, err := s.expandTagSet(ctx, []uuid.UUID{tagID})
-	if err != nil {
-		return nil, err
-	}
-
-	// Fetch current tags so we don't lose them.
-	current, err := s.tags.ListByFile(ctx, fileID)
-	if err != nil {
-		return nil, err
-	}
-
-	// Union: existing + expanded new tags.
-	seen := make(map[uuid.UUID]bool, len(current)+len(extra))
-	for _, t := range current {
-		seen[t.ID] = true
-	}
-	merged := make([]uuid.UUID, len(current))
-	for i, t := range current {
-		merged[i] = t.ID
-	}
-	for _, id := range extra {
-		if !seen[id] {
-			seen[id] = true
-			merged = append(merged, id)
-		}
-	}
-
-	if err := s.tags.SetFileTags(ctx, fileID, merged); err != nil {
-		return nil, err
-	}
-
-	objType := fileObjectType
-	_ = s.audit.Log(ctx, "file_tag_add", &objType, &fileID, map[string]any{"tag_id": tagID})
-	return s.tags.ListByFile(ctx, fileID)
-}
-
-// RemoveFileTag removes a single tag from a file.
-func (s *TagService) RemoveFileTag(ctx context.Context, fileID, tagID uuid.UUID) error {
-	if err := s.tags.RemoveFileTag(ctx, fileID, tagID); err != nil {
-		return err
-	}
-
-	objType := fileObjectType
-	_ = s.audit.Log(ctx, "file_tag_remove", &objType, &fileID, map[string]any{"tag_id": tagID})
-	return nil
-}
-
-// BulkSetTags adds or removes tags on multiple files (with rule expansion for add).
-// Returns the tagIDs that were applied (the expanded input set for add; empty for remove).
-func (s *TagService) BulkSetTags(ctx context.Context, fileIDs []uuid.UUID, action string, tagIDs []uuid.UUID) ([]uuid.UUID, error) {
-	if action != "add" && action != "remove" {
-		return nil, domain.ErrValidation
-	}
-
-	// Pre-expand tag set once; all files get the same expansion.
-	var expanded []uuid.UUID
-	if action == "add" {
-		var err error
-		expanded, err = s.expandTagSet(ctx, tagIDs)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	for _, fileID := range fileIDs {
-		switch action {
-		case "add":
-			current, err := s.tags.ListByFile(ctx, fileID)
-			if err != nil {
-				if err == domain.ErrNotFound {
-					continue
-				}
-				return nil, err
-			}
-			seen := make(map[uuid.UUID]bool, len(current))
-			merged := make([]uuid.UUID, len(current))
-			for i, t := range current {
-				seen[t.ID] = true
-				merged[i] = t.ID
-			}
-			for _, id := range expanded {
-				if !seen[id] {
-					seen[id] = true
-					merged = append(merged, id)
-				}
-			}
-			if err := s.tags.SetFileTags(ctx, fileID, merged); err != nil {
-				return nil, err
-			}
-		case "remove":
-			current, err := s.tags.ListByFile(ctx, fileID)
-			if err != nil {
-				if err == domain.ErrNotFound {
-					continue
-				}
-				return nil, err
-			}
-			remove := make(map[uuid.UUID]bool, len(tagIDs))
-			for _, id := range tagIDs {
-				remove[id] = true
-			}
-			kept := make([]uuid.UUID, 0, len(current))
-			for _, t := range current {
-				if !remove[t.ID] {
-					kept = append(kept, t.ID)
-				}
-			}
-			if err := s.tags.SetFileTags(ctx, fileID, kept); err != nil {
-				return nil, err
-			}
-		}
-	}
-
-	if action == "add" {
-		return expanded, nil
-	}
-	return []uuid.UUID{}, nil
-}
-
-// CommonTags returns tags present on ALL given files and tags present on SOME.
-func (s *TagService) CommonTags(ctx context.Context, fileIDs []uuid.UUID) (common, partial []domain.Tag, err error) {
-	common, err = s.tags.CommonTagsForFiles(ctx, fileIDs)
-	if err != nil {
-		return nil, nil, err
-	}
-	partial, err = s.tags.PartialTagsForFiles(ctx, fileIDs)
-	if err != nil {
-		return nil, nil, err
-	}
-	return common, partial, nil
-}
-
-// ---------------------------------------------------------------------------
-// Internal helpers
-// ---------------------------------------------------------------------------
-
-// expandTagSet runs a BFS from the given seed tags, following active tag rules,
-// and returns the full set of tag IDs that should be applied (seeds + auto-applied).
-func (s *TagService) expandTagSet(ctx context.Context, seeds []uuid.UUID) ([]uuid.UUID, error) {
-	visited := make(map[uuid.UUID]bool, len(seeds))
-	queue := make([]uuid.UUID, 0, len(seeds))
-
-	for _, id := range seeds {
-		if !visited[id] {
-			visited[id] = true
-			queue = append(queue, id)
-		}
-	}
-
-	for i := 0; i < len(queue); i++ {
-		tagID := queue[i]
-		rules, err := s.rules.ListByTag(ctx, tagID)
-		if err != nil {
-			return nil, err
-		}
-		for _, r := range rules {
-			if r.IsActive && !visited[r.ThenTagID] {
-				visited[r.ThenTagID] = true
-				queue = append(queue, r.ThenTagID)
-			}
-		}
-	}
-
-	return queue, nil
-}
--- a/backend/internal/service/user_service.go
+++ b/backend/internal/service/user_service.go
@ -1,156 +0,0 @@
-package service
-
-import (
-	"context"
-	"fmt"
-
-	"golang.org/x/crypto/bcrypt"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// UserService handles user CRUD and profile management.
-type UserService struct {
-	users port.UserRepo
-	audit *AuditService
-}
-
-// NewUserService creates a UserService.
-func NewUserService(users port.UserRepo, audit *AuditService) *UserService {
-	return &UserService{users: users, audit: audit}
-}
-
-// ---------------------------------------------------------------------------
-// Self-service
-// ---------------------------------------------------------------------------
-
-// GetMe returns the profile of the currently authenticated user.
-func (s *UserService) GetMe(ctx context.Context) (*domain.User, error) {
-	userID, _, _ := domain.UserFromContext(ctx)
-	return s.users.GetByID(ctx, userID)
-}
-
-// UpdateMeParams holds fields a user may change on their own profile.
-type UpdateMeParams struct {
-	Name     string  // empty = no change
-	Password *string // nil = no change
-}
-
-// UpdateMe allows a user to change their own name and/or password.
-func (s *UserService) UpdateMe(ctx context.Context, p UpdateMeParams) (*domain.User, error) {
-	userID, _, _ := domain.UserFromContext(ctx)
-
-	current, err := s.users.GetByID(ctx, userID)
-	if err != nil {
-		return nil, err
-	}
-
-	patch := *current
-	if p.Name != "" {
-		patch.Name = p.Name
-	}
-	if p.Password != nil {
-		hash, err := bcrypt.GenerateFromPassword([]byte(*p.Password), bcrypt.DefaultCost)
-		if err != nil {
-			return nil, fmt.Errorf("UserService.UpdateMe hash: %w", err)
-		}
-		patch.Password = string(hash)
-	}
-
-	return s.users.Update(ctx, userID, &patch)
-}
-
-// ---------------------------------------------------------------------------
-// Admin CRUD
-// ---------------------------------------------------------------------------
-
-// List returns a paginated list of users (admin only — caller must enforce).
-func (s *UserService) List(ctx context.Context, params port.OffsetParams) (*domain.UserPage, error) {
-	return s.users.List(ctx, params)
-}
-
-// Get returns a user by ID (admin only).
-func (s *UserService) Get(ctx context.Context, id int16) (*domain.User, error) {
-	return s.users.GetByID(ctx, id)
-}
-
-// CreateParams holds fields for creating a new user.
-type CreateUserParams struct {
-	Name      string
-	Password  string
-	IsAdmin   bool
-	CanCreate bool
-}
-
-// Create inserts a new user with a bcrypt-hashed password (admin only).
-func (s *UserService) Create(ctx context.Context, p CreateUserParams) (*domain.User, error) {
-	hash, err := bcrypt.GenerateFromPassword([]byte(p.Password), bcrypt.DefaultCost)
-	if err != nil {
-		return nil, fmt.Errorf("UserService.Create hash: %w", err)
-	}
-
-	u := &domain.User{
-		Name:      p.Name,
-		Password:  string(hash),
-		IsAdmin:   p.IsAdmin,
-		CanCreate: p.CanCreate,
-	}
-	created, err := s.users.Create(ctx, u)
-	if err != nil {
-		return nil, err
-	}
-
-	_ = s.audit.Log(ctx, "user_create", nil, nil, map[string]any{"target_user_id": created.ID})
-	return created, nil
-}
-
-// UpdateAdminParams holds fields an admin may change on any user.
-type UpdateAdminParams struct {
-	IsAdmin   *bool
-	CanCreate *bool
-	IsBlocked *bool
-}
-
-// UpdateAdmin applies an admin-level patch to a user.
-func (s *UserService) UpdateAdmin(ctx context.Context, id int16, p UpdateAdminParams) (*domain.User, error) {
-	current, err := s.users.GetByID(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-
-	patch := *current
-	if p.IsAdmin != nil {
-		patch.IsAdmin = *p.IsAdmin
-	}
-	if p.CanCreate != nil {
-		patch.CanCreate = *p.CanCreate
-	}
-	if p.IsBlocked != nil {
-		patch.IsBlocked = *p.IsBlocked
-	}
-
-	updated, err := s.users.Update(ctx, id, &patch)
-	if err != nil {
-		return nil, err
-	}
-
-	// Log block/unblock specifically.
-	if p.IsBlocked != nil {
-		action := "user_unblock"
-		if *p.IsBlocked {
-			action = "user_block"
-		}
-		_ = s.audit.Log(ctx, action, nil, nil, map[string]any{"target_user_id": id})
-	}
-	return updated, nil
-}
-
-// Delete removes a user by ID (admin only).
-func (s *UserService) Delete(ctx context.Context, id int16) error {
-	if err := s.users.Delete(ctx, id); err != nil {
-		return err
-	}
-	_ = s.audit.Log(ctx, "user_delete", nil, nil, map[string]any{"target_user_id": id})
-	return nil
-}
--- a/backend/internal/storage/disk.go
+++ b/backend/internal/storage/disk.go
@ -1,257 +0,0 @@
-// Package storage provides a local-filesystem implementation of port.FileStorage.
-package storage
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-	"image"
-	"image/color"
-	"image/jpeg"
-	_ "image/gif"                    // register GIF decoder
-	_ "image/png"                    // register PNG decoder
-	_ "golang.org/x/image/webp"      // register WebP decoder
-	"io"
-	"os"
-	"os/exec"
-	"path/filepath"
-
-	"github.com/disintegration/imaging"
-	"github.com/google/uuid"
-
-	"tanabata/backend/internal/domain"
-	"tanabata/backend/internal/port"
-)
-
-// DiskStorage implements port.FileStorage using the local filesystem.
-//
-// Directory layout:
-//
-//	{filesPath}/{id}                — original file (UUID basename, no extension)
-//	{thumbsPath}/{id}_thumb.jpg     — thumbnail cache
-//	{thumbsPath}/{id}_preview.jpg   — preview cache
-type DiskStorage struct {
-	filesPath     string
-	thumbsPath    string
-	thumbWidth    int
-	thumbHeight   int
-	previewWidth  int
-	previewHeight int
-}
-
-var _ port.FileStorage = (*DiskStorage)(nil)
-
-// NewDiskStorage creates a DiskStorage and ensures both directories exist.
-func NewDiskStorage(
-	filesPath, thumbsPath string,
-	thumbW, thumbH, prevW, prevH int,
-) (*DiskStorage, error) {
-	for _, p := range []string{filesPath, thumbsPath} {
-		if err := os.MkdirAll(p, 0o755); err != nil {
-			return nil, fmt.Errorf("storage: create directory %q: %w", p, err)
-		}
-	}
-	return &DiskStorage{
-		filesPath:     filesPath,
-		thumbsPath:    thumbsPath,
-		thumbWidth:    thumbW,
-		thumbHeight:   thumbH,
-		previewWidth:  prevW,
-		previewHeight: prevH,
-	}, nil
-}
-
-// ---------------------------------------------------------------------------
-// port.FileStorage implementation
-// ---------------------------------------------------------------------------
-
-// Save writes r to {filesPath}/{id} and returns the number of bytes written.
-func (s *DiskStorage) Save(_ context.Context, id uuid.UUID, r io.Reader) (int64, error) {
-	dst := s.originalPath(id)
-	f, err := os.Create(dst)
-	if err != nil {
-		return 0, fmt.Errorf("storage.Save create %q: %w", dst, err)
-	}
-	n, copyErr := io.Copy(f, r)
-	closeErr := f.Close()
-	if copyErr != nil {
-		os.Remove(dst)
-		return 0, fmt.Errorf("storage.Save write: %w", copyErr)
-	}
-	if closeErr != nil {
-		os.Remove(dst)
-		return 0, fmt.Errorf("storage.Save close: %w", closeErr)
-	}
-	return n, nil
-}
-
-// Read opens the original file for reading. The caller must close the result.
-func (s *DiskStorage) Read(_ context.Context, id uuid.UUID) (io.ReadCloser, error) {
-	f, err := os.Open(s.originalPath(id))
-	if err != nil {
-		if os.IsNotExist(err) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("storage.Read: %w", err)
-	}
-	return f, nil
-}
-
-// Delete removes the original file. Returns ErrNotFound if it does not exist.
-func (s *DiskStorage) Delete(_ context.Context, id uuid.UUID) error {
-	if err := os.Remove(s.originalPath(id)); err != nil {
-		if os.IsNotExist(err) {
-			return domain.ErrNotFound
-		}
-		return fmt.Errorf("storage.Delete: %w", err)
-	}
-	return nil
-}
-
-// Thumbnail returns a JPEG that fits within the configured max width×height
-// (never upscaled, never cropped). Generated on first call and cached.
-// Video files are thumbnailed via ffmpeg; other non-image files get a placeholder.
-func (s *DiskStorage) Thumbnail(ctx context.Context, id uuid.UUID) (io.ReadCloser, error) {
-	return s.serveGenerated(ctx, id, s.thumbCachePath(id), s.thumbWidth, s.thumbHeight)
-}
-
-// Preview returns a JPEG that fits within the configured max width×height
-// (never upscaled, never cropped). Generated on first call and cached.
-// Video files are thumbnailed via ffmpeg; other non-image files get a placeholder.
-func (s *DiskStorage) Preview(ctx context.Context, id uuid.UUID) (io.ReadCloser, error) {
-	return s.serveGenerated(ctx, id, s.previewCachePath(id), s.previewWidth, s.previewHeight)
-}
-
-// ---------------------------------------------------------------------------
-// Internal helpers
-// ---------------------------------------------------------------------------
-
-// serveGenerated is the shared implementation for Thumbnail and Preview.
-// imaging.Thumbnail fits the source within maxW×maxH without upscaling or cropping.
-//
-// Resolution order:
-//  1. Return cached JPEG if present.
-//  2. Decode as still image (JPEG/PNG/GIF via imaging).
-//  3. Extract a frame with ffmpeg (video files).
-//  4. Solid-colour placeholder (archives, unrecognised formats, etc.).
-func (s *DiskStorage) serveGenerated(ctx context.Context, id uuid.UUID, cachePath string, maxW, maxH int) (io.ReadCloser, error) {
-	// Fast path: cache hit.
-	if f, err := os.Open(cachePath); err == nil {
-		return f, nil
-	}
-
-	// Verify the original file exists before doing any work.
-	srcPath := s.originalPath(id)
-	if _, err := os.Stat(srcPath); err != nil {
-		if os.IsNotExist(err) {
-			return nil, domain.ErrNotFound
-		}
-		return nil, fmt.Errorf("storage: stat %q: %w", srcPath, err)
-	}
-
-	// 1. Try still-image decode (JPEG/PNG/GIF).
-	// 2. Try video frame extraction via ffmpeg.
-	// 3. Fall back to placeholder.
-	var img image.Image
-	if decoded, err := imaging.Open(srcPath, imaging.AutoOrientation(true)); err == nil {
-		img = imaging.Thumbnail(decoded, maxW, maxH, imaging.Lanczos)
-	} else if frame, err := extractVideoFrame(ctx, srcPath); err == nil {
-		img = imaging.Thumbnail(frame, maxW, maxH, imaging.Lanczos)
-	} else {
-		img = placeholder(maxW, maxH)
-	}
-
-	// Write to cache atomically (temp→rename) and return an open reader.
-	if rc, err := writeCache(cachePath, img); err == nil {
-		return rc, nil
-	}
-
-	// Cache write failed (read-only fs, disk full, …). Serve from an
-	// in-memory buffer so the request still succeeds.
-	var buf bytes.Buffer
-	if err := jpeg.Encode(&buf, img, &jpeg.Options{Quality: 85}); err != nil {
-		return nil, fmt.Errorf("storage: encode in-memory JPEG: %w", err)
-	}
-	return io.NopCloser(&buf), nil
-}
-
-// writeCache encodes img as JPEG to cachePath via an atomic temp→rename write,
-// then opens and returns the cache file.
-func writeCache(cachePath string, img image.Image) (io.ReadCloser, error) {
-	dir := filepath.Dir(cachePath)
-	tmp, err := os.CreateTemp(dir, ".cache-*.tmp")
-	if err != nil {
-		return nil, fmt.Errorf("storage: create temp file: %w", err)
-	}
-	tmpName := tmp.Name()
-
-	encErr := jpeg.Encode(tmp, img, &jpeg.Options{Quality: 85})
-	closeErr := tmp.Close()
-	if encErr != nil {
-		os.Remove(tmpName)
-		return nil, fmt.Errorf("storage: encode cache JPEG: %w", encErr)
-	}
-	if closeErr != nil {
-		os.Remove(tmpName)
-		return nil, fmt.Errorf("storage: close temp file: %w", closeErr)
-	}
-	if err := os.Rename(tmpName, cachePath); err != nil {
-		os.Remove(tmpName)
-		return nil, fmt.Errorf("storage: rename cache file: %w", err)
-	}
-	f, err := os.Open(cachePath)
-	if err != nil {
-		return nil, fmt.Errorf("storage: open cache file: %w", err)
-	}
-	return f, nil
-}
-
-// extractVideoFrame uses ffmpeg to extract a single frame from a video file.
-// It seeks 1 second in (keyframe-accurate fast seek) and pipes the frame out
-// as PNG. If the video is shorter than 1 s the seek is silently ignored by
-// ffmpeg and the first available frame is returned instead.
-// Returns an error if ffmpeg is not installed or produces no output.
-func extractVideoFrame(ctx context.Context, srcPath string) (image.Image, error) {
-	var out bytes.Buffer
-	cmd := exec.CommandContext(ctx, "ffmpeg",
-		"-ss", "1", // fast input seek; ignored gracefully on short files
-		"-i", srcPath,
-		"-vframes", "1",
-		"-f", "image2",
-		"-vcodec", "png",
-		"pipe:1",
-	)
-	cmd.Stdout = &out
-	cmd.Stderr = io.Discard // suppress ffmpeg progress output
-
-	if err := cmd.Run(); err != nil || out.Len() == 0 {
-		return nil, fmt.Errorf("ffmpeg frame extract: %w", err)
-	}
-	return imaging.Decode(&out)
-}
-
-// ---------------------------------------------------------------------------
-// Path helpers
-// ---------------------------------------------------------------------------
-
-func (s *DiskStorage) originalPath(id uuid.UUID) string {
-	return filepath.Join(s.filesPath, id.String())
-}
-
-func (s *DiskStorage) thumbCachePath(id uuid.UUID) string {
-	return filepath.Join(s.thumbsPath, id.String()+"_thumb.jpg")
-}
-
-func (s *DiskStorage) previewCachePath(id uuid.UUID) string {
-	return filepath.Join(s.thumbsPath, id.String()+"_preview.jpg")
-}
-
-// ---------------------------------------------------------------------------
-// Image helpers
-// ---------------------------------------------------------------------------
-
-// placeholder returns a solid-colour image of size w×h for files that cannot
-// be decoded as images. Uses #444455 from the design palette.
-func placeholder(w, h int) *image.NRGBA {
-	return imaging.New(w, h, color.NRGBA{R: 0x44, G: 0x44, B: 0x55, A: 0xFF})
-}
--- a/backend/migrations/001_init_schemas.sql
+++ b/backend/migrations/001_init_schemas.sql
@ -1,65 +0,0 @@
-- +goose Up
-
-CREATE EXTENSION IF NOT EXISTS pgcrypto;
-CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
-
-CREATE SCHEMA IF NOT EXISTS core;
-CREATE SCHEMA IF NOT EXISTS data;
-CREATE SCHEMA IF NOT EXISTS acl;
-CREATE SCHEMA IF NOT EXISTS activity;
-
-- UUID v7 generator
-- +goose StatementBegin
-CREATE OR REPLACE FUNCTION public.uuid_v7(cts timestamptz DEFAULT clock_timestamp())
-RETURNS uuid LANGUAGE plpgsql AS $$
-DECLARE
-    state text = current_setting('uuidv7.old_tp', true);
-    old_tp text = split_part(state, ':', 1);
-    base int = coalesce(nullif(split_part(state, ':', 4), '')::int, (random()*16777215/2-1)::int);
-    tp text;
-    entropy text;
-    seq text = base;
-    seqn int = split_part(state, ':', 2);
-    ver text = coalesce(split_part(state, ':', 3), to_hex(8+(random()*3)::int));
-BEGIN
-    base = (random()*16777215/2-1)::int;
-    tp = lpad(to_hex(floor(extract(epoch from cts)*1000)::int8), 12, '0') || '7';
-    IF tp IS DISTINCT FROM old_tp THEN
-        old_tp = tp;
-        ver = to_hex(8+(random()*3)::int);
-        base = (random()*16777215/2-1)::int;
-        seqn = base;
-    ELSE
-        seqn = seqn + (random()*1000)::int;
-    END IF;
-    PERFORM set_config('uuidv7.old_tp', old_tp||':'||seqn||':'||ver||':'||base, false);
-    entropy = md5(gen_random_uuid()::text);
-    seq = lpad(to_hex(seqn), 6, '0');
-    RETURN (tp || substring(seq from 1 for 3) || ver || substring(seq from 4 for 3) ||
-            substring(entropy from 1 for 12))::uuid;
-END;
-$$;
-- +goose StatementEnd
-
-- Extract timestamp from UUID v7
-- +goose StatementBegin
-CREATE OR REPLACE FUNCTION public.uuid_extract_timestamp(uuid_val uuid)
-RETURNS timestamptz LANGUAGE sql IMMUTABLE PARALLEL SAFE AS $$
-    SELECT to_timestamp(
-        ('x' || left(replace(uuid_val::text, '-', ''), 12))::bit(48)::bigint / 1000.0
-    );
-$$;
-- +goose StatementEnd
-
-- +goose Down
-
-DROP FUNCTION IF EXISTS public.uuid_extract_timestamp(uuid);
-DROP FUNCTION IF EXISTS public.uuid_v7(timestamptz);
-
-DROP SCHEMA IF EXISTS activity;
-DROP SCHEMA IF EXISTS acl;
-DROP SCHEMA IF EXISTS data;
-DROP SCHEMA IF EXISTS core;
-
-DROP EXTENSION IF EXISTS "uuid-ossp";
-DROP EXTENSION IF EXISTS pgcrypto;
--- a/backend/migrations/002_core_tables.sql
+++ b/backend/migrations/002_core_tables.sql
@ -1,37 +0,0 @@
-- +goose Up
-
-CREATE TABLE core.users (
-    id         smallint    GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
-    name       varchar(32) NOT NULL,
-    password   text        NOT NULL,  -- bcrypt hash via pgcrypto
-    is_admin   boolean     NOT NULL DEFAULT false,
-    can_create boolean     NOT NULL DEFAULT false,
-    is_blocked boolean     NOT NULL DEFAULT false,
-
-    CONSTRAINT uni__users__name UNIQUE (name)
-);
-
-CREATE TABLE core.mime_types (
-    id        smallint     GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
-    name      varchar(127) NOT NULL,
-    extension varchar(16)  NOT NULL,
-
-    CONSTRAINT uni__mime_types__name UNIQUE (name)
-);
-
-CREATE TABLE core.object_types (
-    id   smallint    GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
-    name varchar(32) NOT NULL,
-
-    CONSTRAINT uni__object_types__name UNIQUE (name)
-);
-
-COMMENT ON TABLE core.users       IS 'Application users';
-COMMENT ON TABLE core.mime_types  IS 'Whitelist of supported MIME types';
-COMMENT ON TABLE core.object_types IS 'Reference: entity types for ACL and audit log';
-
-- +goose Down
-
-DROP TABLE IF EXISTS core.object_types;
-DROP TABLE IF EXISTS core.mime_types;
-DROP TABLE IF EXISTS core.users;
--- a/backend/migrations/003_data_tables.sql
+++ b/backend/migrations/003_data_tables.sql
@ -1,118 +0,0 @@
-- +goose Up
-
-CREATE TABLE data.categories (
-    id         uuid         NOT NULL DEFAULT public.uuid_v7() PRIMARY KEY,
-    name       varchar(256) NOT NULL,
-    notes      text,
-    color      char(6),
-    metadata   jsonb,
-    creator_id smallint     NOT NULL REFERENCES core.users(id)
-                            ON UPDATE CASCADE ON DELETE RESTRICT,
-    is_public  boolean      NOT NULL DEFAULT false,
-
-    CONSTRAINT uni__categories__name UNIQUE (name),
-    CONSTRAINT chk__categories__color_hex
-        CHECK (color IS NULL OR color ~* '^[A-Fa-f0-9]{6}$')
-);
-
-CREATE TABLE data.tags (
-    id          uuid         NOT NULL DEFAULT public.uuid_v7() PRIMARY KEY,
-    name        varchar(256) NOT NULL,
-    notes       text,
-    color       char(6),
-    category_id uuid         REFERENCES data.categories(id)
-                             ON UPDATE CASCADE ON DELETE SET NULL,
-    metadata    jsonb,
-    creator_id  smallint     NOT NULL REFERENCES core.users(id)
-                             ON UPDATE CASCADE ON DELETE RESTRICT,
-    is_public   boolean      NOT NULL DEFAULT false,
-
-    CONSTRAINT uni__tags__name UNIQUE (name),
-    CONSTRAINT chk__tags__color_hex
-        CHECK (color IS NULL OR color ~* '^[A-Fa-f0-9]{6}$')
-);
-
-CREATE TABLE data.tag_rules (
-    when_tag_id uuid    NOT NULL REFERENCES data.tags(id)
-                        ON UPDATE CASCADE ON DELETE CASCADE,
-    then_tag_id uuid    NOT NULL REFERENCES data.tags(id)
-                        ON UPDATE CASCADE ON DELETE CASCADE,
-    is_active   boolean NOT NULL DEFAULT true,
-
-    PRIMARY KEY (when_tag_id, then_tag_id)
-);
-
-CREATE TABLE data.files (
-    id               uuid         NOT NULL DEFAULT public.uuid_v7() PRIMARY KEY,
-    original_name    varchar(256),          -- original filename at upload time
-    mime_id          smallint     NOT NULL REFERENCES core.mime_types(id)
-                                  ON UPDATE CASCADE ON DELETE RESTRICT,
-    content_datetime timestamptz  NOT NULL DEFAULT clock_timestamp(),  -- content datetime (e.g. photo taken)
-    notes            text,
-    metadata         jsonb,                 -- user-editable key-value data
-    exif             jsonb,                 -- EXIF data extracted at upload (immutable)
-    phash            bigint,                -- perceptual hash for duplicate detection (future)
-    creator_id       smallint     NOT NULL REFERENCES core.users(id)
-                                  ON UPDATE CASCADE ON DELETE RESTRICT,
-    is_public        boolean      NOT NULL DEFAULT false,
-    is_deleted       boolean      NOT NULL DEFAULT false  -- soft delete (trash)
-);
-
-CREATE TABLE data.file_tag (
-    file_id uuid NOT NULL REFERENCES data.files(id)
-                 ON UPDATE CASCADE ON DELETE CASCADE,
-    tag_id  uuid NOT NULL REFERENCES data.tags(id)
-                 ON UPDATE CASCADE ON DELETE CASCADE,
-
-    PRIMARY KEY (file_id, tag_id)
-);
-
-CREATE TABLE data.pools (
-    id         uuid         NOT NULL DEFAULT public.uuid_v7() PRIMARY KEY,
-    name       varchar(256) NOT NULL,
-    notes      text,
-    metadata   jsonb,
-    creator_id smallint     NOT NULL REFERENCES core.users(id)
-                            ON UPDATE CASCADE ON DELETE RESTRICT,
-    is_public  boolean      NOT NULL DEFAULT false,
-
-    CONSTRAINT uni__pools__name UNIQUE (name)
-);
-
-- `position` uses integer with gaps (e.g. 1000, 2000, 3000) to allow
-- insertions without renumbering. Compact when gaps get too small.
-CREATE TABLE data.file_pool (
-    file_id  uuid    NOT NULL REFERENCES data.files(id)
-                     ON UPDATE CASCADE ON DELETE CASCADE,
-    pool_id  uuid    NOT NULL REFERENCES data.pools(id)
-                     ON UPDATE CASCADE ON DELETE CASCADE,
-    position integer NOT NULL DEFAULT 0,
-
-    PRIMARY KEY (file_id, pool_id)
-);
-
-COMMENT ON TABLE  data.categories IS 'Logical grouping of tags';
-COMMENT ON TABLE  data.tags       IS 'File labels/tags';
-COMMENT ON TABLE  data.tag_rules  IS 'Auto-tagging rules: when when_tag is assigned, then_tag follows';
-COMMENT ON TABLE  data.files      IS 'Managed files; actual content stored on disk as {id}.{ext}';
-COMMENT ON TABLE  data.file_tag   IS 'Many-to-many: files <-> tags';
-COMMENT ON TABLE  data.pools      IS 'Ordered collections of files';
-COMMENT ON TABLE  data.file_pool  IS 'Many-to-many: files <-> pools, with ordering';
-
-COMMENT ON COLUMN data.files.original_name    IS 'Original filename at upload time';
-COMMENT ON COLUMN data.files.content_datetime IS 'Content datetime (e.g. when photo was taken); falls back to EXIF DateTimeOriginal';
-COMMENT ON COLUMN data.files.metadata         IS 'User-editable key-value metadata';
-COMMENT ON COLUMN data.files.exif             IS 'EXIF data extracted at upload time (immutable, system-managed)';
-COMMENT ON COLUMN data.files.phash            IS 'Perceptual hash for image/video duplicate detection';
-COMMENT ON COLUMN data.files.is_deleted       IS 'Soft-deleted files (trash); true = in recycle bin';
-COMMENT ON COLUMN data.file_pool.position     IS 'Manual ordering within pool; uses gapped integers';
-
-- +goose Down
-
-DROP TABLE IF EXISTS data.file_pool;
-DROP TABLE IF EXISTS data.pools;
-DROP TABLE IF EXISTS data.file_tag;
-DROP TABLE IF EXISTS data.files;
-DROP TABLE IF EXISTS data.tag_rules;
-DROP TABLE IF EXISTS data.tags;
-DROP TABLE IF EXISTS data.categories;
--- a/backend/migrations/004_acl_tables.sql
+++ b/backend/migrations/004_acl_tables.sql
@ -1,22 +0,0 @@
-- +goose Up
-
-- If is_public=true on the object, it is accessible to everyone (ACL ignored).
-- If is_public=false, only creator and users with can_view=true see it.
-- Admins bypass all ACL checks.
-CREATE TABLE acl.permissions (
-    user_id        smallint NOT NULL REFERENCES core.users(id)
-                            ON UPDATE CASCADE ON DELETE CASCADE,
-    object_type_id smallint NOT NULL REFERENCES core.object_types(id)
-                            ON UPDATE CASCADE ON DELETE RESTRICT,
-    object_id      uuid     NOT NULL,
-    can_view       boolean  NOT NULL DEFAULT true,
-    can_edit       boolean  NOT NULL DEFAULT false,
-
-    PRIMARY KEY (user_id, object_type_id, object_id)
-);
-
-COMMENT ON TABLE acl.permissions IS 'Per-object permissions (used when is_public=false)';
-
-- +goose Down
-
-DROP TABLE IF EXISTS acl.permissions;
--- a/backend/migrations/005_activity_tables.sql
+++ b/backend/migrations/005_activity_tables.sql
@ -1,82 +0,0 @@
-- +goose Up
-
-CREATE TABLE activity.action_types (
-    id   smallint    GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
-    name varchar(64) NOT NULL,
-
-    CONSTRAINT uni__action_types__name UNIQUE (name)
-);
-
-CREATE TABLE activity.sessions (
-    id            integer      GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
-    token_hash    text         NOT NULL,  -- hashed session token
-    user_id       smallint     NOT NULL REFERENCES core.users(id)
-                               ON UPDATE CASCADE ON DELETE CASCADE,
-    user_agent    varchar(256) NOT NULL,
-    started_at    timestamptz  NOT NULL DEFAULT statement_timestamp(),
-    expires_at    timestamptz,
-    last_activity timestamptz  NOT NULL DEFAULT statement_timestamp(),
-    is_active     boolean      NOT NULL DEFAULT true,
-
-    CONSTRAINT uni__sessions__token_hash UNIQUE (token_hash)
-);
-
-CREATE TABLE activity.file_views (
-    file_id    uuid        NOT NULL REFERENCES data.files(id)
-                           ON UPDATE CASCADE ON DELETE CASCADE,
-    user_id    smallint    NOT NULL REFERENCES core.users(id)
-                           ON UPDATE CASCADE ON DELETE CASCADE,
-    viewed_at  timestamptz NOT NULL DEFAULT statement_timestamp(),
-
-    PRIMARY KEY (file_id, viewed_at, user_id)
-);
-
-CREATE TABLE activity.pool_views (
-    pool_id    uuid        NOT NULL REFERENCES data.pools(id)
-                           ON UPDATE CASCADE ON DELETE CASCADE,
-    user_id    smallint    NOT NULL REFERENCES core.users(id)
-                           ON UPDATE CASCADE ON DELETE CASCADE,
-    viewed_at  timestamptz NOT NULL DEFAULT statement_timestamp(),
-
-    PRIMARY KEY (pool_id, viewed_at, user_id)
-);
-
-CREATE TABLE activity.tag_uses (
-    tag_id      uuid        NOT NULL REFERENCES data.tags(id)
-                            ON UPDATE CASCADE ON DELETE CASCADE,
-    user_id     smallint    NOT NULL REFERENCES core.users(id)
-                            ON UPDATE CASCADE ON DELETE CASCADE,
-    used_at     timestamptz NOT NULL DEFAULT statement_timestamp(),
-    is_included boolean     NOT NULL,  -- true=included in filter, false=excluded
-
-    PRIMARY KEY (tag_id, used_at, user_id)
-);
-
-CREATE TABLE activity.audit_log (
-    id             bigint      GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
-    user_id        smallint    NOT NULL REFERENCES core.users(id)
-                               ON UPDATE CASCADE ON DELETE RESTRICT,
-    action_type_id smallint    NOT NULL REFERENCES activity.action_types(id)
-                               ON UPDATE CASCADE ON DELETE RESTRICT,
-    object_type_id smallint    REFERENCES core.object_types(id)
-                               ON UPDATE CASCADE ON DELETE RESTRICT,
-    object_id      uuid,
-    details        jsonb,               -- action-specific payload
-    performed_at   timestamptz NOT NULL DEFAULT statement_timestamp()
-);
-
-COMMENT ON TABLE activity.action_types IS 'Reference: types of auditable user actions';
-COMMENT ON TABLE activity.sessions     IS 'Active user sessions';
-COMMENT ON TABLE activity.file_views   IS 'File view history';
-COMMENT ON TABLE activity.pool_views   IS 'Pool view history';
-COMMENT ON TABLE activity.tag_uses     IS 'Tag usage in filters';
-COMMENT ON TABLE activity.audit_log    IS 'Unified audit trail for all user actions';
-
-- +goose Down
-
-DROP TABLE IF EXISTS activity.audit_log;
-DROP TABLE IF EXISTS activity.tag_uses;
-DROP TABLE IF EXISTS activity.pool_views;
-DROP TABLE IF EXISTS activity.file_views;
-DROP TABLE IF EXISTS activity.sessions;
-DROP TABLE IF EXISTS activity.action_types;
--- a/backend/migrations/006_indexes.sql
+++ b/backend/migrations/006_indexes.sql
@ -1,87 +0,0 @@
-- +goose Up
-
-- core
-CREATE INDEX idx__users__name ON core.users USING hash (name);
-
-- data.categories
-CREATE INDEX idx__categories__creator_id ON data.categories USING hash (creator_id);
-
-- data.tags
-CREATE INDEX idx__tags__category_id ON data.tags USING hash (category_id);
-CREATE INDEX idx__tags__creator_id  ON data.tags USING hash (creator_id);
-
-- data.tag_rules
-CREATE INDEX idx__tag_rules__when ON data.tag_rules USING hash (when_tag_id);
-CREATE INDEX idx__tag_rules__then ON data.tag_rules USING hash (then_tag_id);
-
-- data.files
-CREATE INDEX idx__files__mime_id           ON data.files USING hash (mime_id);
-CREATE INDEX idx__files__creator_id        ON data.files USING hash (creator_id);
-CREATE INDEX idx__files__content_datetime  ON data.files USING btree (content_datetime DESC NULLS LAST);
-CREATE INDEX idx__files__is_deleted        ON data.files USING btree (is_deleted) WHERE is_deleted = true;
-CREATE INDEX idx__files__phash             ON data.files USING btree (phash) WHERE phash IS NOT NULL;
-
-- data.file_tag
-CREATE INDEX idx__file_tag__tag_id  ON data.file_tag USING hash (tag_id);
-CREATE INDEX idx__file_tag__file_id ON data.file_tag USING hash (file_id);
-
-- data.pools
-CREATE INDEX idx__pools__creator_id ON data.pools USING hash (creator_id);
-
-- data.file_pool
-CREATE INDEX idx__file_pool__pool_id ON data.file_pool USING hash (pool_id);
-CREATE INDEX idx__file_pool__file_id ON data.file_pool USING hash (file_id);
-
-- acl.permissions
-CREATE INDEX idx__acl__object ON acl.permissions USING btree (object_type_id, object_id);
-CREATE INDEX idx__acl__user   ON acl.permissions USING hash (user_id);
-
-- activity.sessions
-CREATE INDEX idx__sessions__user_id    ON activity.sessions USING hash (user_id);
-CREATE INDEX idx__sessions__token_hash ON activity.sessions USING hash (token_hash);
-
-- activity.file_views
-CREATE INDEX idx__file_views__user_id ON activity.file_views USING hash (user_id);
-
-- activity.pool_views
-CREATE INDEX idx__pool_views__user_id ON activity.pool_views USING hash (user_id);
-
-- activity.tag_uses
-CREATE INDEX idx__tag_uses__user_id ON activity.tag_uses USING hash (user_id);
-
-- activity.audit_log
-CREATE INDEX idx__audit_log__user_id        ON activity.audit_log USING hash (user_id);
-CREATE INDEX idx__audit_log__action_type_id ON activity.audit_log USING hash (action_type_id);
-CREATE INDEX idx__audit_log__object         ON activity.audit_log USING btree (object_type_id, object_id)
-    WHERE object_id IS NOT NULL;
-CREATE INDEX idx__audit_log__performed_at   ON activity.audit_log USING btree (performed_at DESC);
-
-- +goose Down
-
-DROP INDEX IF EXISTS activity.idx__audit_log__performed_at;
-DROP INDEX IF EXISTS activity.idx__audit_log__object;
-DROP INDEX IF EXISTS activity.idx__audit_log__action_type_id;
-DROP INDEX IF EXISTS activity.idx__audit_log__user_id;
-DROP INDEX IF EXISTS activity.idx__tag_uses__user_id;
-DROP INDEX IF EXISTS activity.idx__pool_views__user_id;
-DROP INDEX IF EXISTS activity.idx__file_views__user_id;
-DROP INDEX IF EXISTS activity.idx__sessions__token_hash;
-DROP INDEX IF EXISTS activity.idx__sessions__user_id;
-DROP INDEX IF EXISTS acl.idx__acl__user;
-DROP INDEX IF EXISTS acl.idx__acl__object;
-DROP INDEX IF EXISTS data.idx__file_pool__file_id;
-DROP INDEX IF EXISTS data.idx__file_pool__pool_id;
-DROP INDEX IF EXISTS data.idx__pools__creator_id;
-DROP INDEX IF EXISTS data.idx__file_tag__file_id;
-DROP INDEX IF EXISTS data.idx__file_tag__tag_id;
-DROP INDEX IF EXISTS data.idx__files__phash;
-DROP INDEX IF EXISTS data.idx__files__is_deleted;
-DROP INDEX IF EXISTS data.idx__files__content_datetime;
-DROP INDEX IF EXISTS data.idx__files__creator_id;
-DROP INDEX IF EXISTS data.idx__files__mime_id;
-DROP INDEX IF EXISTS data.idx__tag_rules__then;
-DROP INDEX IF EXISTS data.idx__tag_rules__when;
-DROP INDEX IF EXISTS data.idx__tags__creator_id;
-DROP INDEX IF EXISTS data.idx__tags__category_id;
-DROP INDEX IF EXISTS data.idx__categories__creator_id;
-DROP INDEX IF EXISTS core.idx__users__name;
--- a/backend/migrations/007_seed_data.sql
+++ b/backend/migrations/007_seed_data.sql
@ -1,49 +0,0 @@
-- +goose Up
-
-INSERT INTO core.mime_types (name, extension) VALUES
-    ('image/jpeg',       'jpg'),
-    ('image/png',        'png'),
-    ('image/gif',        'gif'),
-    ('image/webp',       'webp'),
-    ('video/mp4',        'mp4'),
-    ('video/quicktime',  'mov'),
-    ('video/x-msvideo',  'avi'),
-    ('video/webm',       'webm'),
-    ('video/3gpp',       '3gp'),
-    ('video/x-m4v',      'm4v');
-
-INSERT INTO core.object_types (name) VALUES
-    ('file'), ('tag'), ('category'), ('pool');
-
-INSERT INTO activity.action_types (name) VALUES
-    -- Auth
-    ('user_login'), ('user_logout'),
-    -- Files
-    ('file_create'), ('file_edit'), ('file_delete'), ('file_restore'),
-    ('file_permanent_delete'), ('file_replace'),
-    -- Tags
-    ('tag_create'), ('tag_edit'), ('tag_delete'),
-    -- Categories
-    ('category_create'), ('category_edit'), ('category_delete'),
-    -- Pools
-    ('pool_create'), ('pool_edit'), ('pool_delete'),
-    -- Relations
-    ('file_tag_add'), ('file_tag_remove'),
-    ('file_pool_add'), ('file_pool_remove'),
-    -- ACL
-    ('acl_change'),
-    -- Admin
-    ('user_create'), ('user_delete'), ('user_block'), ('user_unblock'),
-    ('user_role_change'),
-    -- Sessions
-    ('session_terminate');
-
-INSERT INTO core.users (name, password, is_admin, can_create) VALUES
-    ('admin', '$2a$10$zk.VTFjRRxbkTE7cKfc7KOWeZfByk1VEkbkgZMJggI1fFf.yDEHZy', true, true);
-
-- +goose Down
-
-DELETE FROM core.users WHERE name = 'admin';
-DELETE FROM activity.action_types;
-DELETE FROM core.object_types;
-DELETE FROM core.mime_types;
--- a/backend/migrations/embed.go
+++ b/backend/migrations/embed.go
@ -1,8 +0,0 @@
-package migrations
-
-import "embed"
-
-// FS holds all goose migration SQL files, embedded at build time.
-//
-//go:embed *.sql
-var FS embed.FS
--- a/database/create-schema.sql
+++ b/database/create-schema.sql
@ -0,0 +1,592 @@
+--
+-- PostgreSQL database dump
+--
+
+-- Dumped from database version 14.18 (Ubuntu 14.18-0ubuntu0.22.04.1)
+-- Dumped by pg_dump version 17.4
+
+SET statement_timeout = 0;
+SET lock_timeout = 0;
+SET idle_in_transaction_session_timeout = 0;
+SET transaction_timeout = 0;
+SET client_encoding = 'UTF8';
+SET standard_conforming_strings = on;
+SELECT pg_catalog.set_config('search_path', '', false);
+SET check_function_bodies = false;
+SET xmloption = content;
+SET client_min_messages = warning;
+SET row_security = off;
+
+--
+-- Name: acl; Type: SCHEMA; Schema: -; Owner: -
+--
+
+CREATE SCHEMA acl;
+
+
+--
+-- Name: activity; Type: SCHEMA; Schema: -; Owner: -
+--
+
+CREATE SCHEMA activity;
+
+
+--
+-- Name: data; Type: SCHEMA; Schema: -; Owner: -
+--
+
+CREATE SCHEMA data;
+
+
+--
+-- Name: public; Type: SCHEMA; Schema: -; Owner: -
+--
+
+-- *not* creating schema, since initdb creates it
+
+
+--
+-- Name: system; Type: SCHEMA; Schema: -; Owner: -
+--
+
+CREATE SCHEMA system;
+
+
+--
+-- Name: pgcrypto; Type: EXTENSION; Schema: -; Owner: -
+--
+
+CREATE EXTENSION IF NOT EXISTS pgcrypto WITH SCHEMA public;
+
+
+--
+-- Name: EXTENSION pgcrypto; Type: COMMENT; Schema: -; Owner: -
+--
+
+COMMENT ON EXTENSION pgcrypto IS 'cryptographic functions';
+
+
+--
+-- Name: uuid-ossp; Type: EXTENSION; Schema: -; Owner: -
+--
+
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp" WITH SCHEMA public;
+
+
+--
+-- Name: EXTENSION "uuid-ossp"; Type: COMMENT; Schema: -; Owner: -
+--
+
+COMMENT ON EXTENSION "uuid-ossp" IS 'generate universally unique identifiers (UUIDs)';
+
+
+--
+-- Name: add_file_to_tag_recursive(uuid, uuid); Type: FUNCTION; Schema: data; Owner: -
+--
+
+CREATE FUNCTION data.add_file_to_tag_recursive(f_id uuid, t_id uuid) RETURNS SETOF uuid
+    LANGUAGE plpgsql
+    AS $$
+DECLARE
+	tmp uuid;
+	tt_id uuid;
+	ttt_id uuid;
+BEGIN
+	INSERT INTO data.file_tag VALUES (f_id, t_id) ON CONFLICT DO NOTHING RETURNING tag_id INTO tmp;
+	IF tmp IS NULL THEN
+		RETURN;
+	END IF;
+	RETURN NEXT t_id;
+	FOR tt_id IN
+		SELECT a.add_tag_id FROM data.autotags a WHERE a.trigger_tag_id=t_id AND a.is_active
+	LOOP
+		FOR ttt_id IN SELECT data.add_file_to_tag_recursive(f_id, tt_id)
+		LOOP
+			RETURN NEXT ttt_id;
+		END LOOP;
+	END LOOP;
+END;
+$$;
+
+
+--
+-- Name: uuid_extract_timestamp(uuid); Type: FUNCTION; Schema: public; Owner: -
+--
+
+CREATE FUNCTION public.uuid_extract_timestamp(uuid_val uuid) RETURNS timestamp with time zone
+    LANGUAGE sql IMMUTABLE
+    AS $$
+    SELECT to_timestamp(
+        ('x' || LEFT(REPLACE(uuid_val::TEXT, '-', ''), 12))::BIT(48)::BIGINT
+        / 1000.0
+    );
+$$;
+
+
+--
+-- Name: uuid_v7(timestamp with time zone); Type: FUNCTION; Schema: public; Owner: -
+--
+
+CREATE FUNCTION public.uuid_v7(cts timestamp with time zone DEFAULT clock_timestamp()) RETURNS uuid
+    LANGUAGE plpgsql
+    AS $$
+DECLARE
+  state text = current_setting('uuidv7.old_tp',true);
+  old_tp text = split_part(state, ':',1);
+  base int = coalesce(nullif(split_part(state,':',4),'')::int,(random()*16777215/2-1)::int);
+  tp text;
+  entropy text;
+  seq text=base;
+  seqn int=split_part(state,':',2);
+  ver text = coalesce(split_part(state,':',3),to_hex(8+(random()*3)::int));
+BEGIN
+  base = (random()*16777215/2-1)::int;
+  tp = lpad(to_hex(floor(extract(epoch from cts)*1000)::int8),12,'0')||'7';
+  if tp is distinct from old_tp then
+    old_tp = tp;
+    ver = to_hex(8+(random()*3)::int);
+    base = (random()*16777215/2-1)::int;
+    seqn = base;
+  else
+    seqn = seqn+(random()*1000)::int;
+  end if;
+  perform set_config('uuidv7.old_tp',old_tp||':'||seqn||':'||ver||':'||base, false);
+  entropy = md5(gen_random_uuid()::text);
+  seq = lpad(to_hex(seqn),6,'0');
+  return (tp || substring(seq from 1 for 3) || ver || substring(seq from 4 for 3) ||
+                substring(entropy from 1 for 12))::uuid;
+END
+$$;
+
+
+SET default_table_access_method = heap;
+
+--
+-- Name: categories; Type: TABLE; Schema: acl; Owner: -
+--
+
+CREATE TABLE acl.categories (
+    user_id smallint NOT NULL,
+    category_id uuid NOT NULL,
+    view boolean NOT NULL,
+    edit boolean NOT NULL
+);
+
+
+--
+-- Name: files; Type: TABLE; Schema: acl; Owner: -
+--
+
+CREATE TABLE acl.files (
+    user_id smallint NOT NULL,
+    file_id uuid NOT NULL,
+    view boolean NOT NULL,
+    edit boolean NOT NULL
+);
+
+
+--
+-- Name: pools; Type: TABLE; Schema: acl; Owner: -
+--
+
+CREATE TABLE acl.pools (
+    user_id smallint NOT NULL,
+    pool_id uuid NOT NULL,
+    view boolean NOT NULL,
+    edit boolean NOT NULL
+);
+
+
+--
+-- Name: tags; Type: TABLE; Schema: acl; Owner: -
+--
+
+CREATE TABLE acl.tags (
+    user_id smallint NOT NULL,
+    tag_id uuid NOT NULL,
+    view boolean NOT NULL,
+    edit boolean NOT NULL
+);
+
+
+--
+-- Name: file_views; Type: TABLE; Schema: activity; Owner: -
+--
+
+CREATE TABLE activity.file_views (
+    file_id uuid NOT NULL,
+    "timestamp" timestamp with time zone NOT NULL,
+    user_id smallint NOT NULL
+);
+
+
+--
+-- Name: pool_views; Type: TABLE; Schema: activity; Owner: -
+--
+
+CREATE TABLE activity.pool_views (
+    pool_id uuid NOT NULL,
+    "timestamp" timestamp with time zone NOT NULL,
+    user_id smallint NOT NULL
+);
+
+
+--
+-- Name: sessions; Type: TABLE; Schema: activity; Owner: -
+--
+
+CREATE TABLE activity.sessions (
+    id integer NOT NULL,
+    token text NOT NULL,
+    user_id smallint NOT NULL,
+    user_agent character varying(256) NOT NULL,
+    started_at timestamp with time zone DEFAULT statement_timestamp() NOT NULL,
+    expires_at timestamp with time zone,
+    last_activity timestamp with time zone DEFAULT statement_timestamp() NOT NULL
+);
+
+
+--
+-- Name: sessions_id_seq; Type: SEQUENCE; Schema: activity; Owner: -
+--
+
+CREATE SEQUENCE activity.sessions_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- Name: sessions_id_seq; Type: SEQUENCE OWNED BY; Schema: activity; Owner: -
+--
+
+ALTER SEQUENCE activity.sessions_id_seq OWNED BY activity.sessions.id;
+
+
+--
+-- Name: tag_uses; Type: TABLE; Schema: activity; Owner: -
+--
+
+CREATE TABLE activity.tag_uses (
+    tag_id uuid NOT NULL,
+    "timestamp" timestamp with time zone NOT NULL,
+    user_id smallint NOT NULL,
+    included boolean NOT NULL
+);
+
+
+--
+-- Name: autotags; Type: TABLE; Schema: data; Owner: -
+--
+
+CREATE TABLE data.autotags (
+    trigger_tag_id uuid NOT NULL,
+    add_tag_id uuid NOT NULL,
+    is_active boolean DEFAULT true NOT NULL
+);
+
+
+--
+-- Name: categories; Type: TABLE; Schema: data; Owner: -
+--
+
+CREATE TABLE data.categories (
+    id uuid DEFAULT public.uuid_v7() NOT NULL,
+    name character varying(256) NOT NULL,
+    notes text DEFAULT ''::text NOT NULL,
+    color character(6),
+    creator_id smallint NOT NULL
+);
+
+
+--
+-- Name: file_pool; Type: TABLE; Schema: data; Owner: -
+--
+
+CREATE TABLE data.file_pool (
+    file_id uuid NOT NULL,
+    pool_id uuid NOT NULL,
+    number smallint NOT NULL
+);
+
+
+--
+-- Name: file_tag; Type: TABLE; Schema: data; Owner: -
+--
+
+CREATE TABLE data.file_tag (
+    file_id uuid NOT NULL,
+    tag_id uuid NOT NULL
+);
+
+
+--
+-- Name: files; Type: TABLE; Schema: data; Owner: -
+--
+
+CREATE TABLE data.files (
+    id uuid DEFAULT public.uuid_v7() NOT NULL,
+    name character varying(256),
+    mime_id smallint NOT NULL,
+    datetime timestamp with time zone DEFAULT clock_timestamp() NOT NULL,
+    notes text,
+    metadata jsonb NOT NULL,
+    creator_id smallint NOT NULL,
+    is_deleted boolean DEFAULT false NOT NULL
+);
+
+
+--
+-- Name: pools; Type: TABLE; Schema: data; Owner: -
+--
+
+CREATE TABLE data.pools (
+    id uuid DEFAULT public.uuid_v7() NOT NULL,
+    name character varying(256) NOT NULL,
+    notes text,
+    creator_id smallint NOT NULL
+);
+
+
+--
+-- Name: tags; Type: TABLE; Schema: data; Owner: -
+--
+
+CREATE TABLE data.tags (
+    id uuid DEFAULT public.uuid_v7() NOT NULL,
+    name character varying(256) NOT NULL,
+    notes text,
+    color character(6),
+    category_id uuid,
+    creator_id smallint NOT NULL
+);
+
+
+--
+-- Name: mime; Type: TABLE; Schema: system; Owner: -
+--
+
+CREATE TABLE system.mime (
+    id smallint NOT NULL,
+    name character varying(127) NOT NULL,
+    extension character varying(16) NOT NULL
+);
+
+
+--
+-- Name: mime_id_seq; Type: SEQUENCE; Schema: system; Owner: -
+--
+
+CREATE SEQUENCE system.mime_id_seq
+    AS smallint
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- Name: mime_id_seq; Type: SEQUENCE OWNED BY; Schema: system; Owner: -
+--
+
+ALTER SEQUENCE system.mime_id_seq OWNED BY system.mime.id;
+
+
+--
+-- Name: users; Type: TABLE; Schema: system; Owner: -
+--
+
+CREATE TABLE system.users (
+    id smallint NOT NULL,
+    name character varying(32) NOT NULL,
+    password text NOT NULL,
+    is_admin boolean DEFAULT false NOT NULL,
+    can_create boolean DEFAULT false NOT NULL
+);
+
+
+--
+-- Name: users_id_seq; Type: SEQUENCE; Schema: system; Owner: -
+--
+
+CREATE SEQUENCE system.users_id_seq
+    AS smallint
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- Name: users_id_seq; Type: SEQUENCE OWNED BY; Schema: system; Owner: -
+--
+
+ALTER SEQUENCE system.users_id_seq OWNED BY system.users.id;
+
+
+--
+-- Name: sessions id; Type: DEFAULT; Schema: activity; Owner: -
+--
+
+ALTER TABLE ONLY activity.sessions ALTER COLUMN id SET DEFAULT nextval('activity.sessions_id_seq'::regclass);
+
+
+--
+-- Name: mime id; Type: DEFAULT; Schema: system; Owner: -
+--
+
+ALTER TABLE ONLY system.mime ALTER COLUMN id SET DEFAULT nextval('system.mime_id_seq'::regclass);
+
+
+--
+-- Name: users id; Type: DEFAULT; Schema: system; Owner: -
+--
+
+ALTER TABLE ONLY system.users ALTER COLUMN id SET DEFAULT nextval('system.users_id_seq'::regclass);
+
+
+--
+-- Name: categories categories_pkey; Type: CONSTRAINT; Schema: acl; Owner: -
+--
+
+ALTER TABLE ONLY acl.categories
+    ADD CONSTRAINT categories_pkey PRIMARY KEY (user_id, category_id);
+
+
+--
+-- Name: files files_pkey; Type: CONSTRAINT; Schema: acl; Owner: -
+--
+
+ALTER TABLE ONLY acl.files
+    ADD CONSTRAINT files_pkey PRIMARY KEY (user_id, file_id);
+
+
+--
+-- Name: pools pools_pkey; Type: CONSTRAINT; Schema: acl; Owner: -
+--
+
+ALTER TABLE ONLY acl.pools
+    ADD CONSTRAINT pools_pkey PRIMARY KEY (user_id, pool_id);
+
+
+--
+-- Name: tags tags_pkey; Type: CONSTRAINT; Schema: acl; Owner: -
+--
+
+ALTER TABLE ONLY acl.tags
+    ADD CONSTRAINT tags_pkey PRIMARY KEY (user_id, tag_id);
+
+
+--
+-- Name: file_views file_views_pkey; Type: CONSTRAINT; Schema: activity; Owner: -
+--
+
+ALTER TABLE ONLY activity.file_views
+    ADD CONSTRAINT file_views_pkey PRIMARY KEY (file_id, "timestamp", user_id);
+
+
+--
+-- Name: pool_views pool_views_pkey; Type: CONSTRAINT; Schema: activity; Owner: -
+--
+
+ALTER TABLE ONLY activity.pool_views
+    ADD CONSTRAINT pool_views_pkey PRIMARY KEY (pool_id, "timestamp", user_id);
+
+
+--
+-- Name: sessions sessions_pkey; Type: CONSTRAINT; Schema: activity; Owner: -
+--
+
+ALTER TABLE ONLY activity.sessions
+    ADD CONSTRAINT sessions_pkey PRIMARY KEY (id);
+
+
+--
+-- Name: tag_uses tag_uses_pkey; Type: CONSTRAINT; Schema: activity; Owner: -
+--
+
+ALTER TABLE ONLY activity.tag_uses
+    ADD CONSTRAINT tag_uses_pkey PRIMARY KEY (tag_id, "timestamp", user_id);
+
+
+--
+-- Name: autotags autotags_pkey; Type: CONSTRAINT; Schema: data; Owner: -
+--
+
+ALTER TABLE ONLY data.autotags
+    ADD CONSTRAINT autotags_pkey PRIMARY KEY (trigger_tag_id, add_tag_id);
+
+
+--
+-- Name: categories categories_pkey; Type: CONSTRAINT; Schema: data; Owner: -
+--
+
+ALTER TABLE ONLY data.categories
+    ADD CONSTRAINT categories_pkey PRIMARY KEY (id);
+
+
+--
+-- Name: file_pool file_pool_pkey; Type: CONSTRAINT; Schema: data; Owner: -
+--
+
+ALTER TABLE ONLY data.file_pool
+    ADD CONSTRAINT file_pool_pkey PRIMARY KEY (file_id, pool_id, number);
+
+
+--
+-- Name: file_tag file_tag_pkey; Type: CONSTRAINT; Schema: data; Owner: -
+--
+
+ALTER TABLE ONLY data.file_tag
+    ADD CONSTRAINT file_tag_pkey PRIMARY KEY (file_id, tag_id);
+
+
+--
+-- Name: files files_pkey; Type: CONSTRAINT; Schema: data; Owner: -
+--
+
+ALTER TABLE ONLY data.files
+    ADD CONSTRAINT files_pkey PRIMARY KEY (id);
+
+
+--
+-- Name: pools pools_pkey; Type: CONSTRAINT; Schema: data; Owner: -
+--
+
+ALTER TABLE ONLY data.pools
+    ADD CONSTRAINT pools_pkey PRIMARY KEY (id);
+
+
+--
+-- Name: tags tags_pkey; Type: CONSTRAINT; Schema: data; Owner: -
+--
+
+ALTER TABLE ONLY data.tags
+    ADD CONSTRAINT tags_pkey PRIMARY KEY (id);
+
+
+--
+-- Name: mime mime_pkey; Type: CONSTRAINT; Schema: system; Owner: -
+--
+
+ALTER TABLE ONLY system.mime
+    ADD CONSTRAINT mime_pkey PRIMARY KEY (id);
+
+
+--
+-- Name: users users_pkey; Type: CONSTRAINT; Schema: system; Owner: -
+--
+
+ALTER TABLE ONLY system.users
+    ADD CONSTRAINT users_pkey PRIMARY KEY (id);
+
+
+--
+-- PostgreSQL database dump complete
+--
+
--- a/docs/FRONTEND_STRUCTURE.md
+++ b/docs/FRONTEND_STRUCTURE.md
@ -1,383 +0,0 @@
-# Tanabata File Manager — Frontend Structure
-
-## Stack
-
- **Framework**: SvelteKit (SPA mode, `ssr: false`)
- **Language**: TypeScript
- **CSS**: Tailwind CSS + CSS custom properties (hybrid)
- **API types**: Auto-generated via openapi-typescript
- **PWA**: Service worker + web manifest
- **Font**: Epilogue (variable weight)
- **Package manager**: npm
-
-## Monorepo Layout
-
-```
-tanabata/
-├── backend/                    ← Go project (go.mod in here)
-│   ├── cmd/
-│   ├── internal/
-│   ├── migrations/
-│   ├── go.mod
-│   └── go.sum
-│
-├── frontend/                   ← SvelteKit project (package.json in here)
-│   └── (see below)
-│
-├── openapi.yaml                ← Shared API contract (root level)
-├── docker-compose.yml
-├── Dockerfile
-├── .env.example
-└── README.md
-```
-
-`openapi.yaml` lives at repository root — both backend and frontend
-reference it. The frontend generates types from it; the backend
-validates its handlers against it.
-
-## Frontend Directory Layout
-
-```
-frontend/
-├── package.json
-├── svelte.config.js
-├── vite.config.ts
-├── tsconfig.json
-├── tailwind.config.ts
-├── postcss.config.js
-│
-├── src/
-│   ├── app.html                    # Shell HTML (PWA meta, font preload)
-│   ├── app.css                     # Tailwind directives + CSS custom properties
-│   ├── hooks.server.ts             # Server hooks (not used in SPA mode)
-│   ├── hooks.client.ts             # Client hooks (global error handling)
-│   │
-│   ├── lib/                        # Shared code ($lib/ alias)
-│   │   │
-│   │   ├── api/                    # API client layer
-│   │   │   ├── client.ts           # Base fetch wrapper: auth headers, token refresh,
-│   │   │   │                       # error parsing, base URL
-│   │   │   ├── files.ts            # listFiles, getFile, uploadFile, deleteFile, etc.
-│   │   │   ├── tags.ts             # listTags, createTag, getTag, updateTag, etc.
-│   │   │   ├── categories.ts       # Category API functions
-│   │   │   ├── pools.ts            # Pool API functions
-│   │   │   ├── auth.ts             # login, logout, refresh, listSessions
-│   │   │   ├── acl.ts              # getPermissions, setPermissions
-│   │   │   ├── users.ts            # getMe, updateMe, admin user CRUD
-│   │   │   ├── audit.ts            # queryAuditLog
-│   │   │   ├── schema.ts           # AUTO-GENERATED from openapi.yaml (do not edit)
-│   │   │   └── types.ts            # Friendly type aliases:
-│   │   │                           #   export type File = components["schemas"]["File"]
-│   │   │                           #   export type Tag = components["schemas"]["Tag"]
-│   │   │
-│   │   ├── components/             # Reusable UI components
-│   │   │   │
-│   │   │   ├── layout/             # App shell
-│   │   │   │   ├── Navbar.svelte       # Bottom navigation bar (mobile-first)
-│   │   │   │   ├── Header.svelte       # Section header with sorting controls
-│   │   │   │   ├── SelectionBar.svelte # Floating bar for multi-select actions
-│   │   │   │   └── Loader.svelte       # Full-screen loading overlay
-│   │   │   │
-│   │   │   ├── file/               # File-related components
-│   │   │   │   ├── FileGrid.svelte     # Thumbnail grid with infinite scroll
-│   │   │   │   ├── FileCard.svelte     # Single thumbnail (160×160, selectable)
-│   │   │   │   ├── FileViewer.svelte   # Full-screen preview with prev/next navigation
-│   │   │   │   ├── FileUpload.svelte   # Upload form + drag-and-drop zone
-│   │   │   │   ├── FileDetail.svelte   # Metadata editor (notes, datetime, tags)
-│   │   │   │   └── FilterBar.svelte    # DSL filter builder UI
-│   │   │   │
-│   │   │   ├── tag/                # Tag-related components
-│   │   │   │   ├── TagBadge.svelte     # Colored pill with tag name
-│   │   │   │   ├── TagPicker.svelte    # Searchable tag selector (add/remove)
-│   │   │   │   ├── TagList.svelte      # Tag grid for section view
-│   │   │   │   └── TagRuleEditor.svelte # Auto-tag rule management
-│   │   │   │
-│   │   │   ├── pool/               # Pool-related components
-│   │   │   │   ├── PoolCard.svelte     # Pool preview card
-│   │   │   │   ├── PoolFileList.svelte # Ordered file list with drag reorder
-│   │   │   │   └── PoolDetail.svelte   # Pool metadata editor
-│   │   │   │
-│   │   │   ├── acl/                # Access control components
-│   │   │   │   └── PermissionEditor.svelte  # User permission grid
-│   │   │   │
-│   │   │   └── common/             # Shared primitives
-│   │   │       ├── Button.svelte
-│   │   │       ├── Modal.svelte
-│   │   │       ├── ConfirmDialog.svelte
-│   │   │       ├── Toast.svelte
-│   │   │       ├── InfiniteScroll.svelte
-│   │   │       ├── Pagination.svelte
-│   │   │       ├── SortDropdown.svelte
-│   │   │       ├── SearchInput.svelte
-│   │   │       ├── ColorPicker.svelte
-│   │   │       ├── Checkbox.svelte     # Three-state: checked, unchecked, partial
-│   │   │       └── EmptyState.svelte
-│   │   │
-│   │   ├── stores/                 # Svelte stores (global state)
-│   │   │   ├── auth.ts             # Current user, JWT tokens, isAuthenticated
-│   │   │   ├── selection.ts        # Selected item IDs, selection mode toggle
-│   │   │   ├── sorting.ts          # Per-section sort key + order (persisted to localStorage)
-│   │   │   ├── theme.ts            # Dark/light mode (persisted, respects prefers-color-scheme)
-│   │   │   └── toast.ts            # Notification queue (success, error, info)
-│   │   │
-│   │   └── utils/                  # Pure helper functions
-│   │       ├── format.ts           # formatDate, formatFileSize, formatDuration
-│   │       ├── dsl.ts              # Filter DSL builder: UI state → query string
-│   │       ├── pwa.ts              # PWA reset, cache clear, update prompt
-│   │       └── keyboard.ts         # Keyboard shortcut helpers (Ctrl+A, Escape, etc.)
-│   │
-│   ├── routes/                     # SvelteKit file-based routing
-│   │   │
-│   │   ├── +layout.svelte          # Root layout: Navbar, theme wrapper, toast container
-│   │   ├── +layout.ts              # Root load: auth guard → redirect to /login if no token
-│   │   │
-│   │   ├── +page.svelte            # / → redirect to /files
-│   │   │
-│   │   ├── login/
-│   │   │   └── +page.svelte        # Login form (decorative Tanabata images)
-│   │   │
-│   │   ├── files/
-│   │   │   ├── +page.svelte        # File grid: filter bar, sort, multi-select, upload
-│   │   │   ├── +page.ts            # Load: initial file list (cursor page)
-│   │   │   ├── [id]/
-│   │   │   │   ├── +page.svelte    # File view: preview, metadata, tags, ACL
-│   │   │   │   └── +page.ts        # Load: file detail + tags
-│   │   │   └── trash/
-│   │   │       ├── +page.svelte    # Trash: restore / permanent delete
-│   │   │       └── +page.ts
-│   │   │
-│   │   ├── tags/
-│   │   │   ├── +page.svelte        # Tag list: search, sort, multi-select
-│   │   │   ├── +page.ts
-│   │   │   ├── new/
-│   │   │   │   └── +page.svelte    # Create tag form
-│   │   │   └── [id]/
-│   │   │       ├── +page.svelte    # Tag detail: edit, category, rules, parent tags
-│   │   │       └── +page.ts
-│   │   │
-│   │   ├── categories/
-│   │   │   ├── +page.svelte        # Category list
-│   │   │   ├── +page.ts
-│   │   │   ├── new/
-│   │   │   │   └── +page.svelte
-│   │   │   └── [id]/
-│   │   │       ├── +page.svelte    # Category detail: edit, view tags
-│   │   │       └── +page.ts
-│   │   │
-│   │   ├── pools/
-│   │   │   ├── +page.svelte        # Pool list
-│   │   │   ├── +page.ts
-│   │   │   ├── new/
-│   │   │   │   └── +page.svelte
-│   │   │   └── [id]/
-│   │   │       ├── +page.svelte    # Pool detail: files (reorderable), filter, edit
-│   │   │       └── +page.ts
-│   │   │
-│   │   ├── settings/
-│   │   │   ├── +page.svelte        # Profile: name, password, active sessions
-│   │   │   └── +page.ts
-│   │   │
-│   │   └── admin/
-│   │       ├── +layout.svelte      # Admin layout: restrict to is_admin
-│   │       ├── users/
-│   │       │   ├── +page.svelte    # User management list
-│   │       │   ├── +page.ts
-│   │       │   └── [id]/
-│   │       │       ├── +page.svelte # User detail: role, block/unblock
-│   │       │       └── +page.ts
-│   │       └── audit/
-│   │           ├── +page.svelte    # Audit log with filters
-│   │           └── +page.ts
-│   │
-│   └── service-worker.ts          # PWA: offline cache for pinned files, app shell caching
-│
-└── static/
-    ├── favicon.png
-    ├── favicon.ico
-    ├── manifest.webmanifest        # PWA manifest (name, icons, theme_color)
-    ├── images/
-    │   ├── tanabata-left.png       # Login page decorations (from current design)
-    │   ├── tanabata-right.png
-    │   └── icons/                  # PWA icons (192×192, 512×512, etc.)
-    └── fonts/
-        └── Epilogue-VariableFont_wght.ttf
-```
-
-## Key Architecture Decisions
-
-### CSS Hybrid: Tailwind + Custom Properties
-
-Theme colors defined as CSS custom properties in `app.css`:
-
-```css
-@tailwind base;
-@tailwind components;
-@tailwind utilities;
-
-:root {
-  --color-bg-primary: #312F45;
-  --color-bg-secondary: #181721;
-  --color-bg-elevated: #111118;
-  --color-accent: #9592B5;
-  --color-accent-hover: #7D7AA4;
-  --color-text-primary: #f0f0f0;
-  --color-text-muted: #9999AD;
-  --color-danger: #DB6060;
-  --color-info: #4DC7ED;
-  --color-warning: #F5E872;
-  --color-tag-default: #444455;
-}
-
-:root[data-theme="light"] {
-  --color-bg-primary: #f5f5f5;
-  --color-bg-secondary: #ffffff;
-  /* ... */
-}
-```
-
-Tailwind references them in `tailwind.config.ts`:
-
-```ts
-export default {
-  theme: {
-    extend: {
-      colors: {
-        bg: {
-          primary: 'var(--color-bg-primary)',
-          secondary: 'var(--color-bg-secondary)',
-          elevated: 'var(--color-bg-elevated)',
-        },
-        accent: {
-          DEFAULT: 'var(--color-accent)',
-          hover: 'var(--color-accent-hover)',
-        },
-        // ...
-      },
-      fontFamily: {
-        sans: ['Epilogue', 'sans-serif'],
-      },
-    },
-  },
-  darkMode: 'class', // controlled via data-theme attribute
-};
-```
-
-Usage in components: `<div class="bg-bg-primary text-text-primary rounded-xl p-4">`.
-Complex cases use scoped `<style>` inside `.svelte` files.
-
-### API Client Pattern
-
-`client.ts` — thin wrapper around fetch:
-
-```ts
-// $lib/api/client.ts
-import { authStore } from '$lib/stores/auth';
-
-const BASE = '/api/v1';
-
-async function request<T>(path: string, init?: RequestInit): Promise<T> {
-  const token = get(authStore).accessToken;
-  const res = await fetch(BASE + path, {
-    ...init,
-    headers: {
-      'Content-Type': 'application/json',
-      ...(token && { Authorization: `Bearer ${token}` }),
-      ...init?.headers,
-    },
-  });
-  if (res.status === 401) {
-    // attempt refresh, retry once
-  }
-  if (!res.ok) {
-    const err = await res.json();
-    throw new ApiError(res.status, err.code, err.message, err.details);
-  }
-  if (res.status === 204) return undefined as T;
-  return res.json();
-}
-
-export const api = {
-  get: <T>(path: string) => request<T>(path),
-  post: <T>(path: string, body?: unknown) =>
-    request<T>(path, { method: 'POST', body: JSON.stringify(body) }),
-  patch: <T>(path: string, body?: unknown) =>
-    request<T>(path, { method: 'PATCH', body: JSON.stringify(body) }),
-  put: <T>(path: string, body?: unknown) =>
-    request<T>(path, { method: 'PUT', body: JSON.stringify(body) }),
-  delete: <T>(path: string) => request<T>(path, { method: 'DELETE' }),
-  upload: <T>(path: string, formData: FormData) =>
-    request<T>(path, { method: 'POST', body: formData, headers: {} }),
-};
-```
-
-Domain-specific modules use it:
-
-```ts
-// $lib/api/files.ts
-import { api } from './client';
-import type { File, FileCursorPage } from './types';
-
-export function listFiles(params: Record<string, string>) {
-  const qs = new URLSearchParams(params).toString();
-  return api.get<FileCursorPage>(`/files?${qs}`);
-}
-
-export function uploadFile(formData: FormData) {
-  return api.upload<File>('/files', formData);
-}
-```
-
-### Type Generation
-
-Script in `package.json`:
-
-```json
-{
-  "scripts": {
-    "generate:types": "openapi-typescript ../openapi.yaml -o src/lib/api/schema.ts",
-    "dev": "npm run generate:types && vite dev",
-    "build": "npm run generate:types && vite build"
-  }
-}
-```
-
-Friendly aliases in `types.ts`:
-
-```ts
-import type { components } from './schema';
-
-export type File = components['schemas']['File'];
-export type Tag = components['schemas']['Tag'];
-export type Category = components['schemas']['Category'];
-export type Pool = components['schemas']['Pool'];
-export type FileCursorPage = components['schemas']['FileCursorPage'];
-export type TagOffsetPage = components['schemas']['TagOffsetPage'];
-export type Error = components['schemas']['Error'];
-// ...
-```
-
-### SPA Mode
-
-`svelte.config.js`:
-
-```js
-import adapter from '@sveltejs/adapter-static';
-
-export default {
-  kit: {
-    adapter: adapter({ fallback: 'index.html' }),
-    // SPA: all routes handled client-side
-  },
-};
-```
-
-The Go backend serves `index.html` for all non-API routes (SPA fallback).
-In development, Vite dev server proxies `/api` to the Go backend.
-
-### PWA
-
-`service-worker.ts` handles:
- App shell caching (HTML, CSS, JS, fonts)
- User-pinned file caching (explicit, via UI button)
- Cache versioning and cleanup on update
- Reset function (clear all caches except pinned files)
--- a/docs/GO_PROJECT_STRUCTURE.md
+++ b/docs/GO_PROJECT_STRUCTURE.md
@ -1,320 +0,0 @@
-# Tanabata File Manager — Go Project Structure
-
-## Stack
-
- **Router**: Gin
- **Database**: pgx v5 (pgxpool)
- **Migrations**: goose v3 + go:embed (auto-migrate on startup)
- **Auth**: JWT (golang-jwt/jwt/v5)
- **Config**: environment variables via .env (joho/godotenv)
- **Logging**: slog (stdlib, Go 1.21+)
- **Validation**: go-playground/validator/v10
- **EXIF**: rwcarlsen/goexif or dsoprea/go-exif
- **Image processing**: disintegration/imaging (thumbnails, previews)
- **Architecture**: Clean Architecture (domain → service → repository/handler)
-
-## Monorepo Layout
-
-```
-tanabata/
-├── backend/                            ← Go project
-├── frontend/                           ← SvelteKit project
-├── openapi.yaml                        ← Shared API contract
-├── docker-compose.yml
-├── Dockerfile
-├── .env.example
-└── README.md
-```
-
-## Backend Directory Layout
-
-```
-backend/
-├── cmd/
-│   └── server/
-│       └── main.go                     # Entrypoint: config → DB → migrate → wire → run
-│
-├── internal/
-│   │
-│   ├── domain/                         # Pure business entities & value objects
-│   │   ├── file.go                     # File, FileFilter, FilePage
-│   │   ├── tag.go                      # Tag, TagRule
-│   │   ├── category.go                 # Category
-│   │   ├── pool.go                     # Pool, PoolFile
-│   │   ├── user.go                     # User, Session
-│   │   ├── acl.go                      # Permission, ObjectType
-│   │   ├── audit.go                    # AuditEntry, ActionType
-│   │   └── errors.go                   # Domain error types (ErrNotFound, ErrForbidden, etc.)
-│   │
-│   ├── port/                           # Interfaces (ports) — contracts between layers
-│   │   ├── repository.go              # FileRepo, TagRepo, CategoryRepo, PoolRepo,
-│   │   │                               # UserRepo, SessionRepo, ACLRepo, AuditRepo,
-│   │   │                               # MimeRepo, TagRuleRepo
-│   │   └── storage.go                 # FileStorage interface (disk operations)
-│   │
-│   ├── service/                        # Business logic (use cases)
-│   │   ├── file_service.go             # Upload, update, delete, trash/restore, replace,
-│   │   │                               # import, filter/list, duplicate detection
-│   │   ├── tag_service.go              # CRUD + auto-tag application logic
-│   │   ├── category_service.go         # CRUD (thin, delegates to repo + ACL + audit)
-│   │   ├── pool_service.go             # CRUD + file ordering, add/remove files
-│   │   ├── auth_service.go             # Login, logout, JWT issue/refresh, session management
-│   │   ├── acl_service.go              # Permission checks, grant/revoke
-│   │   ├── audit_service.go            # Log actions, query audit log
-│   │   └── user_service.go             # Profile update, admin CRUD, block/unblock
-│   │
-│   ├── handler/                        # HTTP layer (Gin handlers)
-│   │   ├── router.go                   # Route registration, middleware wiring
-│   │   ├── middleware.go               # Auth middleware (JWT extraction → context)
-│   │   ├── request.go                  # Common request parsing helpers
-│   │   ├── response.go                 # Error/success response builders
-│   │   ├── file_handler.go             # /files endpoints
-│   │   ├── tag_handler.go              # /tags endpoints
-│   │   ├── category_handler.go         # /categories endpoints
-│   │   ├── pool_handler.go             # /pools endpoints
-│   │   ├── auth_handler.go             # /auth endpoints
-│   │   ├── acl_handler.go              # /acl endpoints
-│   │   ├── user_handler.go             # /users endpoints
-│   │   └── audit_handler.go            # /audit endpoints
-│   │
-│   ├── db/                             # Database adapters
-│   │   ├── db.go                       # Common helpers: pagination, repo factory, transactor base
-│   │   └── postgres/                   # PostgreSQL implementation
-│   │       ├── postgres.go             # pgxpool init, tx-from-context helpers
-│   │       ├── file_repo.go            # FileRepo implementation
-│   │       ├── tag_repo.go             # TagRepo + TagRuleRepo implementation
-│   │       ├── category_repo.go        # CategoryRepo implementation
-│   │       ├── pool_repo.go            # PoolRepo implementation
-│   │       ├── user_repo.go            # UserRepo implementation
-│   │       ├── session_repo.go         # SessionRepo implementation
-│   │       ├── acl_repo.go             # ACLRepo implementation
-│   │       ├── audit_repo.go           # AuditRepo implementation
-│   │       ├── mime_repo.go            # MimeRepo implementation
-│   │       └── filter_parser.go        # DSL → SQL WHERE clause builder
-│   │
-│   ├── storage/                        # File storage adapter
-│   │   └── disk.go                     # FileStorage implementation (read/write/delete on disk)
-│   │
-│   └── config/                         # Configuration
-│       └── config.go                   # Struct + loader from env vars
-│
-├── migrations/                         # SQL migration files (goose format)
-│   ├── 001_init_schemas.sql
-│   ├── 002_core_tables.sql
-│   ├── 003_data_tables.sql
-│   ├── 004_acl_tables.sql
-│   ├── 005_activity_tables.sql
-│   ├── 006_indexes.sql
-│   └── 007_seed_data.sql
-│
-├── go.mod
-└── go.sum
-```
-
-## Layer Dependency Rules
-
-```
-handler  →  service  →  port (interfaces)  ←  db/postgres / storage
-                ↓
-              domain (entities, value objects, errors)
-```
-
- **domain/**: zero imports from other internal packages. Only stdlib.
- **port/**: imports only domain/. Defines interfaces.
- **service/**: imports domain/ and port/. Never imports db/ or handler/.
- **handler/**: imports domain/ and service/. Never imports db/.
- **db/postgres/**: imports domain/, port/, and db/ (common helpers). Implements port interfaces.
- **db/**: imports domain/ and port/. Shared utilities for all DB adapters.
- **storage/**: imports domain/ and port/. Implements FileStorage.
-
-No layer may import a layer above it. No circular dependencies.
-
-## Key Design Decisions
-
-### Dependency Injection (Wiring)
-
-Manual wiring in `cmd/server/main.go`. No DI frameworks.
-
-```go
-// Pseudocode
-pool := postgres.NewPool(cfg.DatabaseURL)
-goose.Up(pool, migrations)
-
-// Repos (all from internal/db/postgres/)
-fileRepo   := postgres.NewFileRepo(pool)
-tagRepo    := postgres.NewTagRepo(pool)
-// ...
-
-// Storage
-diskStore  := storage.NewDiskStorage(cfg.FilesPath)
-
-// Services
-aclSvc     := service.NewACLService(aclRepo, objectTypeRepo)
-auditSvc   := service.NewAuditService(auditRepo, actionTypeRepo)
-fileSvc    := service.NewFileService(fileRepo, mimeRepo, tagRepo, diskStore, aclSvc, auditSvc)
-tagSvc     := service.NewTagService(tagRepo, tagRuleRepo, aclSvc, auditSvc)
-// ...
-
-// Handlers
-fileHandler := handler.NewFileHandler(fileSvc, tagSvc)
-// ...
-
-router := handler.NewRouter(cfg, fileHandler, tagHandler, ...)
-router.Run(cfg.ListenAddr)
-```
-
-### Context Propagation
-
-Every service method receives `context.Context` as the first argument.
-The handler extracts user info from JWT (via middleware) and puts it
-into context. Services read the current user from context for ACL checks
-and audit logging.
-
-```go
-// middleware.go
-func (m *AuthMiddleware) Handle(c *gin.Context) {
-    claims := parseJWT(c.GetHeader("Authorization"))
-    ctx := domain.WithUser(c.Request.Context(), claims.UserID, claims.IsAdmin)
-    c.Request = c.Request.WithContext(ctx)
-    c.Next()
-}
-
-// domain/context.go
-type ctxKey int
-const userKey ctxKey = iota
-func WithUser(ctx context.Context, userID int16, isAdmin bool) context.Context { ... }
-func UserFromContext(ctx context.Context) (userID int16, isAdmin bool) { ... }
-```
-
-### Transaction Management
-
-Repository interfaces include a `Transactor`:
-
-```go
-// port/repository.go
-type Transactor interface {
-    WithTx(ctx context.Context, fn func(ctx context.Context) error) error
-}
-```
-
-The postgres implementation wraps `pgxpool.Pool.BeginTx`. Inside `fn`,
-all repo calls use the transaction from context. This allows services
-to compose multiple repo calls in a single transaction:
-
-```go
-// service/file_service.go
-func (s *FileService) Upload(ctx context.Context, input UploadInput) (*domain.File, error) {
-    return s.tx.WithTx(ctx, func(ctx context.Context) error {
-        file, err := s.fileRepo.Create(ctx, ...)  // uses tx
-        if err != nil { return err }
-        for _, tagID := range input.TagIDs {
-            s.tagRepo.AddFileTag(ctx, file.ID, tagID)  // same tx
-        }
-        s.auditRepo.Log(ctx, ...)  // same tx
-        return nil
-    })
-}
-```
-
-### ACL Check Pattern
-
-ACL logic is centralized in `ACLService`. Other services call it before
-any data mutation or retrieval:
-
-```go
-// service/acl_service.go
-func (s *ACLService) CanView(ctx context.Context, objectType string, objectID uuid.UUID) error {
-    userID, isAdmin := domain.UserFromContext(ctx)
-    if isAdmin { return nil }
-    // Check is_public on the object
-    // If not public, check creator_id == userID
-    // If not creator, check acl.permissions
-    // Return domain.ErrForbidden if none match
-}
-```
-
-### Error Mapping
-
-Domain errors → HTTP status codes (handled in handler/response.go):
-
-| Domain Error          | HTTP Status | Error Code        |
-|-----------------------|-------------|-------------------|
-| ErrNotFound           | 404         | not_found         |
-| ErrForbidden          | 403         | forbidden         |
-| ErrUnauthorized       | 401         | unauthorized      |
-| ErrConflict           | 409         | conflict          |
-| ErrValidation         | 400         | validation_error  |
-| ErrUnsupportedMIME    | 415         | unsupported_mime  |
-| (unexpected)          | 500         | internal_error    |
-
-### Filter DSL
-
-The DSL parser lives in `db/postgres/filter_parser.go` because it produces
-SQL WHERE clauses — it is a PostgreSQL-specific adapter concern.
-The service layer passes the raw DSL string to the repository; the
-repository parses it and builds the query.
-
-For a different DBMS, a corresponding parser would live in
-`db/<dbms>/filter_parser.go`.
-
-The interface:
-```go
-// port/repository.go
-type FileRepo interface {
-    List(ctx context.Context, params FileListParams) (*domain.FilePage, error)
-    // ...
-}
-
-// domain/file.go
-type FileListParams struct {
-    Filter    string    // raw DSL string
-    Sort      string
-    Order     string
-    Cursor    string
-    Anchor    *uuid.UUID
-    Direction string    // "forward" or "backward"
-    Limit     int
-    Trash     bool
-    Search    string
-}
-```
-
-### JWT Structure
-
-```go
-type Claims struct {
-    jwt.RegisteredClaims
-    UserID   int16 `json:"uid"`
-    IsAdmin  bool  `json:"adm"`
-    SessionID int  `json:"sid"`
-}
-```
-
-Access token: short-lived (15 min). Refresh token: long-lived (30 days),
-stored as hash in `activity.sessions.token_hash`.
-
-### Configuration (.env)
-
-```env
-# Server
-LISTEN_ADDR=:8080
-JWT_SECRET=<random-32-bytes>
-JWT_ACCESS_TTL=15m
-JWT_REFRESH_TTL=720h
-
-# Database
-DATABASE_URL=postgres://user:pass@host:5432/tanabata?sslmode=disable
-
-# Storage
-FILES_PATH=/data/files
-THUMBS_CACHE_PATH=/data/thumbs
-
-# Thumbnails
-THUMB_WIDTH=160
-THUMB_HEIGHT=160
-PREVIEW_WIDTH=1920
-PREVIEW_HEIGHT=1080
-
-# Import
-IMPORT_PATH=/data/import
-```
--- a/docs/erd.puml
+++ b/docs/erd.puml
@ -0,0 +1,212 @@
+@startuml Tanabata File Manager entity relationship diagram
+
+' skinparam linetype ortho
+
+
+' ========== SYSTEM ==========
+
+entity "system.users" as usr {
+    * id : smallserial <<generated>>
+    --
+    * name : varchar(32)
+    * password : text
+    * is_admin : boolean
+    * can_create : boolean
+}
+
+entity "system.mime" as mime {
+    * id : smallserial <<generated>>
+    --
+    * name : varchar(127)
+    * extension : varchar(16)
+}
+
+
+' ========== DATA ==========
+
+entity "data.categories" as cty {
+    * id : uuid <<generated>>
+    --
+    * name : varchar(256)
+      notes : text
+      color : char(6)
+    ' * created_at : timestamptz <<generated>>
+    * creator_id : smallint
+    ' * is_private : boolean
+}
+
+cty::creator_id }o--|| usr::id
+
+entity "data.files" as fle {
+    * id : uuid <<generated>>
+    --
+      name : varchar(256)
+    * mime_id : smallint
+    * datetime : timestamptz
+      notes : text
+    * metadata : jsonb
+    ' * created_at : timestamptz <<generated>>
+    * creator_id : smallint
+    ' * is_private : boolean
+    * is_deleted : boolean
+}
+
+fle::mime_id }o--|| mime::id
+fle::creator_id }o--|| usr::id
+
+entity "data.tags" as tag {
+    * id : uuid <<generated>>
+    --
+    * name : varchar(256)
+      notes : text
+      color : char(6)
+      category_id : uuid
+    ' * created_at : timestamptz <<generated>>
+    * creator_id : smallint
+    ' * is_private : boolean
+}
+
+tag::category_id }o--o| cty::id
+tag::creator_id }o--|| usr::id
+
+entity "data.file_tag" as ft {
+    * file_id : uuid
+    * tag_id : uuid
+}
+
+ft::file_id }o--|| fle::id
+ft::tag_id }o--|| tag::id
+
+entity "data.autotags" as atg {
+    * trigger_tag_id : uuid
+    * add_tag_id : uuid
+    --
+    * is_active : boolean
+}
+
+atg::trigger_tag_id }o--|| tag::id
+atg::add_tag_id }o--|| tag::id
+
+entity "data.pools" as pool {
+    * id : uuid <<generated>>
+    --
+    * name : varchar(256)
+      notes : text
+    '   parent_id : uuid
+    ' * created_at : timestamptz
+    * creator_id : smallint
+    ' * is_private : boolean
+}
+
+pool::creator_id }o--|| usr::id
+' pool::parent_id }o--o| pool::id
+
+entity "data.file_pool" as fp {
+    * file_id : uuid
+    * pool_id : uuid
+    * number : smallint
+}
+
+fp::file_id }o--|| fle::id
+fp::pool_id }o--|| pool::id
+
+
+' ========== ACL ==========
+
+entity "acl.files" as acl_f {
+    * user_id : smallint
+    * file_id : uuid
+    --
+    * view : boolean
+    * edit : boolean
+}
+
+acl_f::user_id }o--|| usr::id
+acl_f::file_id }o--|| fle::id
+
+entity "acl.tags" as acl_t {
+    * user_id : smallint
+    * tag_id : uuid
+    --
+    * view : boolean
+    * edit : boolean
+    ' * files_view : boolean
+    ' * files_edit : boolean
+}
+
+acl_t::user_id }o--|| usr::id
+acl_t::tag_id }o--|| tag::id
+
+entity "acl.categories" as acl_c {
+    * user_id : smallint
+    * category_id : uuid
+    --
+    * view : boolean
+    * edit : boolean
+    ' * tags_view : boolean
+    ' * tags_edit : boolean
+}
+
+acl_c::user_id }o--|| usr::id
+acl_c::category_id }o--|| cty::id
+
+entity "acl.pools" as acl_p {
+    * user_id : smallint
+    * pool_id : uuid
+    --
+    * view : boolean
+    * edit : boolean
+    ' * files_view : boolean
+    ' * files_edit : boolean
+}
+
+acl_p::user_id }o--|| usr::id
+acl_p::pool_id }o--|| pool::id
+
+
+' ========== ACTIVITY ==========
+
+entity "activity.sessions" as ssn {
+    * id : serial <<generated>>
+    --
+    * token : text
+    * user_id : smallint
+    * user_agent : varchar(512)
+    * started_at : timestamptz
+      expires_at : timestamptz
+    * last_activity : timestamptz
+}
+
+ssn::user_id }o--|| usr::id
+
+entity "activity.file_views" as fv {
+    * file_id : uuid
+    * timestamp : timestamptz
+    * user_id : smallint
+}
+
+fv::file_id }o--|| fle::id
+fv::user_id }o--|| usr::id
+
+entity "activity.tag_uses" as tu {
+    * tag_id : uuid
+    * timestamp : timestamptz
+    * user_id : smallint
+    --
+    * included : boolean
+}
+
+tu::tag_id }o--|| tag::id
+tu::user_id }o--|| usr::id
+
+entity "activity.pool_views" as pv {
+    * pool_id : uuid
+    * timestamp : timestamptz
+    * user_id : smallint
+}
+
+pv::pool_id }o--|| pool::id
+pv::user_id }o--|| usr::id
+
+
+@enduml
--- a/docs/reference/api/tfm_api.py
+++ b/docs/reference/api/tfm_api.py
@ -1,374 +0,0 @@
-from configparser import ConfigParser
-from psycopg2.pool import ThreadedConnectionPool
-from psycopg2.extras import RealDictCursor
-from contextlib import contextmanager
-from os import access, W_OK, makedirs, chmod, system
-from os.path import isfile, join, basename
-from shutil import move
-from magic import Magic
-from preview_generator.manager import PreviewManager
-
-conf = None
-
-mage = None
-previewer = None
-
-db_pool = None
-
-DEFAULT_SORTING = {
-	"files": {
-		"key": "created",
-		"asc": False
-	},
-	"tags": {
-		"key": "created",
-		"asc": False
-	},
-	"categories": {
-		"key": "created",
-		"asc": False
-	},
-	"pools": {
-		"key": "created",
-		"asc": False
-	},
-}
-
-
-def Initialize(conf_path="/etc/tfm/tfm.conf"):
-	global mage, previewer
-	load_config(conf_path)
-	mage = Magic(mime=True)
-	previewer = PreviewManager(conf["Paths"]["Thumbs"])
-	db_connect(conf["DB.limits"]["MinimumConnections"], conf["DB.limits"]["MaximumConnections"], **conf["DB.params"])
-
-
-def load_config(path):
-	global conf
-	conf = ConfigParser()
-	conf.read(path)
-
-
-def db_connect(minconn, maxconn, **kwargs):
-	global db_pool
-	db_pool = ThreadedConnectionPool(minconn, maxconn, **kwargs)
-
-
-@contextmanager
-def _db_cursor():
-	global db_pool
-	try:
-		conn = db_pool.getconn()
-	except:
-		raise RuntimeError("Database not connected")
-	try:
-		with conn.cursor(cursor_factory=RealDictCursor) as cur:
-			yield cur
-			conn.commit()
-	except:
-		conn.rollback()
-		raise
-	finally:
-		db_pool.putconn(conn)
-
-
-def _validate_column_name(cur, table, column):
-	cur.execute("SELECT get_column_names(%s) AS name", (table,))
-	if all([column!=col["name"] for col in cur.fetchall()]):
-		raise RuntimeError("Invalid column name")
-
-
-def authorize(username, password, useragent):
-	with _db_cursor() as cur:
-		cur.execute("SELECT tfm_session_request(tfm_user_auth(%s, %s), %s) AS sid", (username, password, useragent))
-		sid = cur.fetchone()["sid"]
-	return TSession(sid)
-
-
-class TSession:
-	sid = None
-
-	def __init__(self, sid):
-		with _db_cursor() as cur:
-			cur.execute("SELECT tfm_session_validate(%s) IS NOT NULL AS valid", (sid,))
-			if not cur.fetchone()["valid"]:
-				raise RuntimeError("Invalid sid")
-			self.sid = sid
-
-	def terminate(self):
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_session_terminate(%s)", (self.sid,))
-		del self
-
-	@property
-	def username(self):
-		with _db_cursor() as cur:
-			cur.execute("SELECT tfm_session_username(%s) AS name", (self.sid,))
-			return cur.fetchone()["name"]
-	
-	@property
-	def is_admin(self):
-		with _db_cursor() as cur:
-			cur.execute("SELECT * FROM tfm_user_get_info(%s)", (self.sid,))
-			return cur.fetchone()["can_edit"]
-
-	def get_files(self, order_key=DEFAULT_SORTING["files"]["key"], order_asc=DEFAULT_SORTING["files"]["asc"], offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_files", order_key)
-			cur.execute("SELECT * FROM tfm_get_files(%%s) ORDER BY %s %s OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid,))
-			return list(map(dict, cur.fetchall()))
-
-	def get_files_by_filter(self, philter=None, order_key=DEFAULT_SORTING["files"]["key"], order_asc=DEFAULT_SORTING["files"]["asc"], offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_files", order_key)
-			cur.execute("SELECT * FROM tfm_get_files_by_filter(%%s, %%s) ORDER BY %s %s OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid, philter))
-			return list(map(dict, cur.fetchall()))
-
-	def get_tags(self, order_key=DEFAULT_SORTING["tags"]["key"], order_asc=DEFAULT_SORTING["tags"]["asc"], offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_tags", order_key)
-			cur.execute("SELECT * FROM tfm_get_tags(%%s) ORDER BY %s %s, name ASC OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid,))
-			return list(map(dict, cur.fetchall()))
-
-	def get_categories(self, order_key=DEFAULT_SORTING["categories"]["key"], order_asc=DEFAULT_SORTING["categories"]["asc"], offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_categories", order_key)
-			cur.execute("SELECT * FROM tfm_get_categories(%%s) ORDER BY %s %s OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid,))
-			return list(map(dict, cur.fetchall()))
-
-	def get_pools(self, order_key=DEFAULT_SORTING["pools"]["key"], order_asc=DEFAULT_SORTING["pools"]["asc"], offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_pools", order_key)
-			cur.execute("SELECT * FROM tfm_get_pools(%%s) ORDER BY %s %s OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid,))
-			return list(map(dict, cur.fetchall()))
-
-	def get_autotags(self, order_key="child_id", order_asc=True, offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_autotags", order_key)
-			cur.execute("SELECT * FROM tfm_get_autotags(%%s) ORDER BY %s %s OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid,))
-			return list(map(dict, cur.fetchall()))
-
-	def get_my_sessions(self, order_key="started", order_asc=False, offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_sessions", order_key)
-			cur.execute("SELECT * FROM tfm_get_my_sessions(%%s) ORDER BY %s %s OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid,))
-			return list(map(dict, cur.fetchall()))
-
-	def get_tags_by_file(self, file_id, order_key=DEFAULT_SORTING["tags"]["key"], order_asc=DEFAULT_SORTING["tags"]["asc"], offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_tags", order_key)
-			cur.execute("SELECT * FROM tfm_get_tags_by_file(%%s, %%s) ORDER BY %s %s OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid, file_id))
-			return list(map(dict, cur.fetchall()))
-
-	def get_files_by_tag(self, tag_id, order_key=DEFAULT_SORTING["files"]["key"], order_asc=DEFAULT_SORTING["files"]["asc"], offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_files", order_key)
-			cur.execute("SELECT * FROM tfm_get_files_by_tag(%%s, %%s) ORDER BY %s %s OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid, tag_id))
-			return list(map(dict, cur.fetchall()))
-
-	def get_files_by_pool(self, pool_id, order_key=DEFAULT_SORTING["files"]["key"], order_asc=DEFAULT_SORTING["files"]["asc"], offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_files", order_key)
-			cur.execute("SELECT * FROM tfm_get_files_by_pool(%%s, %%s) ORDER BY %s %s OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid, pool_id))
-			return list(map(dict, cur.fetchall()))
-
-	def get_parent_tags(self, tag_id, order_key=DEFAULT_SORTING["tags"]["key"], order_asc=DEFAULT_SORTING["tags"]["asc"], offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_tags", order_key)
-			cur.execute("SELECT * FROM tfm_get_parent_tags(%%s, %%s) ORDER BY %s %s OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid, tag_id))
-			return list(map(dict, cur.fetchall()))
-
-	def get_my_file_views(self, file_id=None, order_key="datetime", order_asc=False, offset=0, limit=None):
-		with _db_cursor() as cur:
-			_validate_column_name(cur, "v_files", order_key)
-			cur.execute("SELECT * FROM tfm_get_my_file_views(%%s, %%s) ORDER BY %s %s OFFSET %s LIMIT %s" % (
-				order_key,
-				"ASC" if order_asc else "DESC",
-				int(offset),
-				int(limit) if limit is not None else "ALL"
-			), (self.sid, file_id))
-			return list(map(dict, cur.fetchall()))
-
-	def get_file(self, file_id):
-		with _db_cursor() as cur:
-			cur.execute("SELECT * FROM tfm_get_files(%s) WHERE id=%s", (self.sid, file_id))
-			return cur.fetchone()
-
-	def get_tag(self, tag_id):
-		with _db_cursor() as cur:
-			cur.execute("SELECT * FROM tfm_get_tags(%s) WHERE id=%s", (self.sid, tag_id))
-			return cur.fetchone()
-
-	def get_category(self, category_id):
-		with _db_cursor() as cur:
-			cur.execute("SELECT * FROM tfm_get_categories(%s) WHERE id=%s", (self.sid, category_id))
-			return cur.fetchone()
-
-	def view_file(self, file_id):
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_view_file(%s, %s)", (self.sid, file_id))
-
-	def add_file(self, path, datetime=None, notes=None, is_private=None, orig_name=True):
-		if not isfile(path):
-			raise FileNotFoundError("No such file '%s'" % path)
-		if not access(conf["Paths"]["Files"], W_OK) or not access(conf["Paths"]["Thumbs"], W_OK):
-			raise PermissionError("Invalid directories for files and thumbs")
-		mime = mage.from_file(path)
-		if orig_name == True:
-			orig_name = basename(path)
-		with _db_cursor() as cur:
-			cur.execute("SELECT * FROM tfm_add_file(%s, %s, %s, %s, %s, %s)", (self.sid, mime, datetime, notes, is_private, orig_name))
-			res = cur.fetchone()
-			file_id = res["f_id"]
-			ext = res["ext"]
-			file_path = join(conf["Paths"]["Files"], file_id)
-			move(path, file_path)
-			thumb_path = previewer.get_jpeg_preview(file_path, height=160, width=160)
-			preview_path = previewer.get_jpeg_preview(file_path, height=1080, width=1920)
-			chmod(file_path, 0o664)
-			chmod(thumb_path, 0o664)
-			chmod(preview_path, 0o664)
-			return file_id, ext
-
-	def add_tag(self, name, notes=None, color=None, category_id=None, is_private=None):
-		if color is not None:
-			color = color.replace('#', '')
-		if not category_id:
-			category_id = None
-		with _db_cursor() as cur:
-			cur.execute("SELECT tfm_add_tag(%s, %s, %s, %s, %s, %s) AS id", (self.sid, name, notes, color, category_id, is_private))
-			return cur.fetchone()["id"]
-
-	def add_category(self, name, notes=None, color=None, is_private=None):
-		if color is not None:
-			color = color.replace('#', '')
-		with _db_cursor() as cur:
-			cur.execute("SELECT tfm_add_category(%s, %s, %s, %s, %s) AS id", (self.sid, name, notes, color, is_private))
-			return cur.fetchone()["id"]
-
-	def add_pool(self, name, notes=None, parent_id=None, is_private=None):
-		with _db_cursor() as cur:
-			cur.execute("SELECT tfm_add_pool(%s, %s, %s, %s, %s) AS id", (self.sid, name, notes, parent_id, is_private))
-			return cur.fetchone()["id"]
-
-	def add_autotag(self, child_id, parent_id, is_active=None, apply_to_existing=None):
-		with _db_cursor() as cur:
-			cur.execute("SELECT tfm_add_autotag(%s, %s, %s, %s, %s) AS added", (self.sid, child_id, parent_id, is_active, apply_to_existing))
-			return cur.fetchone()["added"]
-
-	def add_file_to_tag(self, file_id, tag_id):
-		with _db_cursor() as cur:
-			cur.execute("SELECT tfm_add_file_to_tag(%s, %s, %s) AS id", (self.sid, file_id, tag_id))
-			return list(map(lambda t: t["id"], cur.fetchall()))
-
-	def add_file_to_pool(self, file_id, pool_id):
-		with _db_cursor() as cur:
-			cur.execute("SELECT tfm_add_file_to_pool(%s, %s, %s) AS added", (self.sid, file_id, pool_id))
-			return cur.fetchone()["added"]
-
-	def edit_file(self, file_id, mime=None, datetime=None, notes=None, is_private=None):
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_edit_file(%s, %s, %s, %s, %s, %s)", (self.sid, file_id, mime, datetime, notes, is_private))
-
-	def edit_tag(self, tag_id, name=None, notes=None, color=None, category_id=None, is_private=None):
-		if color is not None:
-			color = color.replace('#', '')
-		if not category_id:
-			category_id = None
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_edit_tag(%s, %s, %s, %s, %s, %s, %s)", (self.sid, tag_id, name, notes, color, category_id, is_private))
-
-	def edit_category(self, category_id, name=None, notes=None, color=None, is_private=None):
-		if color is not None:
-			color = color.replace('#', '')
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_edit_category(%s, %s, %s, %s, %s, %s)", (self.sid, category_id, name, notes, color, is_private))
-
-	def edit_pool(self, pool_id, name=None, notes=None, parent_id=None, is_private=None):
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_edit_pool(%s, %s, %s, %s, %s, %s)", (self.sid, pool_id, name, notes, parent_id, is_private))
-
-	def remove_file(self, file_id):
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_remove_file(%s, %s)", (self.sid, file_id))
-			if system("rm %s/%s*" % (conf["Paths"]["Files"], file_id)):
-				raise RuntimeError("Failed to remove file '%s'" % file_id)
-
-	def remove_tag(self, tag_id):
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_remove_tag(%s, %s)", (self.sid, tag_id))
-
-	def remove_category(self, category_id):
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_remove_category(%s, %s)", (self.sid, category_id))
-
-	def remove_pool(self, pool_id):
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_remove_pool(%s, %s)", (self.sid, pool_id))
-
-	def remove_autotag(self, child_id, parent_id):
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_remove_autotag(%s, %s, %s)", (self.sid, child_id, parent_id))
-
-	def remove_file_to_tag(self, file_id, tag_id):
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_remove_file_to_tag(%s, %s, %s)", (self.sid, file_id, tag_id))
-
-	def remove_file_to_pool(self, file_id, pool_id):
-		with _db_cursor() as cur:
-			cur.execute("CALL tfm_remove_file_to_pool(%s, %s, %s)", (self.sid, file_id, pool_id))
--- a/docs/reference/backend/cmd/main.go
+++ b/docs/reference/backend/cmd/main.go
@ -1,22 +0,0 @@
-package main
-
-import (
-	"tanabata/internal/storage/postgres"
-)
-
-func main() {
-	postgres.InitDB("postgres://hiko:taikibansei@192.168.0.25/Tanabata_new?application_name=Tanabata%20testing")
-	// test_json := json.RawMessage([]byte("{\"valery\": \"ponosoff\"}"))
-	// data, statusCode, err := db.FileGetSlice(1, "", "+2", -2, 0)
-	// data, statusCode, err := db.FileGet(1, "0197d056-cfb0-76b5-97e0-bd588826393c")
-	// data, statusCode, err := db.FileAdd(1, "ABOBA.png", "image/png", time.Now(), "slkdfjsldkflsdkfj;sldkf", test_json)
-	// statusCode, err := db.FileUpdate(2, "0197d159-bf3a-7617-a3a8-a4a9fc39eca6", map[string]interface{}{
-	// 	"name": "ponos.png",
-	// })
-	// statusCode, err := db.FileDelete(1, "0197d155-848f-7221-ba4a-4660f257c7d5")
-	// v, e, err := postgres.FileGetAccess(1, "0197d15a-57f9-712c-991e-c512290e774f")
-	// fmt.Printf("V: %s, E: %s\n", v, e)
-	// fmt.Printf("Status: %d\n", statusCode)
-	// fmt.Printf("Error:  %s\n", err)
-	// fmt.Printf("%+v\n", data)
-}
--- a/docs/reference/backend/cmd/main.sync-conflict-20251008-195720-BYUI6ZC.go
+++ b/docs/reference/backend/cmd/main.sync-conflict-20251008-195720-BYUI6ZC.go
@ -1,22 +0,0 @@
-package main
-
-import (
-	"fmt"
-
-	"tanabata/db"
-)
-
-func main() {
-	db.InitDB("postgres://hiko:taikibansei@192.168.0.25/Tanabata_new?application_name=Tanabata%20testing")
-	// test_json := json.RawMessage([]byte("{\"valery\": \"ponosoff\"}"))
-	// data, statusCode, err := db.FileGetSlice(2, "", "+2", -2, 0)
-	// data, statusCode, err := db.FileGet(1, "0197d056-cfb0-76b5-97e0-bd588826393c")
-	// data, statusCode, err := db.FileAdd(1, "ABOBA.png", "image/png", time.Now(), "slkdfjsldkflsdkfj;sldkf", test_json)
-	// statusCode, err := db.FileUpdate(2, "0197d159-bf3a-7617-a3a8-a4a9fc39eca6", map[string]interface{}{
-	// 	"name": "ponos.png",
-	// })
-	statusCode, err := db.FileDelete(1, "0197d155-848f-7221-ba4a-4660f257c7d5")
-	fmt.Printf("Status: %d\n", statusCode)
-	fmt.Printf("Error:  %s\n", err)
-	// fmt.Printf("%+v\n", data)
-}
--- a/docs/reference/backend/db/db.go
+++ b/docs/reference/backend/db/db.go
@ -1,79 +0,0 @@
-package db
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"net/http"
-	"time"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgconn"
-	"github.com/jackc/pgx/v5/pgxpool"
-)
-
-var connPool *pgxpool.Pool
-
-func InitDB(connString string) error {
-	poolConfig, err := pgxpool.ParseConfig(connString)
-	if err != nil {
-		return fmt.Errorf("error while parsing connection string: %w", err)
-	}
-
-	poolConfig.MaxConns = 100
-	poolConfig.MinConns = 0
-	poolConfig.MaxConnLifetime = time.Hour
-	poolConfig.HealthCheckPeriod = 30 * time.Second
-
-	connPool, err = pgxpool.NewWithConfig(context.Background(), poolConfig)
-	if err != nil {
-		return fmt.Errorf("error while initializing DB connections pool: %w", err)
-	}
-	return nil
-}
-
-func transaction(handler func(context.Context, pgx.Tx) (statusCode int, err error)) (statusCode int, err error) {
-	ctx := context.Background()
-	tx, err := connPool.Begin(ctx)
-	if err != nil {
-		statusCode = http.StatusInternalServerError
-		return
-	}
-	statusCode, err = handler(ctx, tx)
-	if err != nil {
-		tx.Rollback(ctx)
-		return
-	}
-	err = tx.Commit(ctx)
-	if err != nil {
-		statusCode = http.StatusInternalServerError
-	}
-	return
-}
-
-// Handle database error
-func handleDBError(errIn error) (statusCode int, err error) {
-	if errIn == nil {
-		statusCode = http.StatusOK
-		return
-	}
-	if errors.Is(errIn, pgx.ErrNoRows) {
-		err = fmt.Errorf("not found")
-		statusCode = http.StatusNotFound
-		return
-	}
-	var pgErr *pgconn.PgError
-	if errors.As(errIn, &pgErr) {
-		switch pgErr.Code {
-		case "22P02", "22007": // Invalid data format
-			err = fmt.Errorf("%s", pgErr.Message)
-			statusCode = http.StatusBadRequest
-			return
-		case "23505": // Unique constraint violation
-			err = fmt.Errorf("already exists")
-			statusCode = http.StatusConflict
-			return
-		}
-	}
-	return http.StatusInternalServerError, errIn
-}
--- a/docs/reference/backend/db/utils.go
+++ b/docs/reference/backend/db/utils.go
@ -1,53 +0,0 @@
-package db
-
-import (
-	"fmt"
-	"net/http"
-	"strconv"
-	"strings"
-)
-
-// Convert "filter" URL param to SQL "WHERE" condition
-func filterToSQL(filter string) (sql string, statusCode int, err error) {
-	// filterTokens := strings.Split(string(filter), ";")
-	sql = "(true)"
-	return
-}
-
-// Convert "sort" URL param to SQL "ORDER BY"
-func sortToSQL(sort string) (sql string, statusCode int, err error) {
-	if sort == "" {
-		return
-	}
-	sortOptions := strings.Split(sort, ",")
-	sql = " ORDER BY "
-	for i, sortOption := range sortOptions {
-		sortOrder := sortOption[:1]
-		sortColumn := sortOption[1:]
-		// parse sorting order marker
-		switch sortOrder {
-		case "+":
-			sortOrder = "ASC"
-		case "-":
-			sortOrder = "DESC"
-		default:
-			err = fmt.Errorf("invalid sorting order mark: %q", sortOrder)
-			statusCode = http.StatusBadRequest
-			return
-		}
-		// validate sorting column
-		var n int
-		n, err = strconv.Atoi(sortColumn)
-		if err != nil || n < 0 {
-			err = fmt.Errorf("invalid sorting column: %q", sortColumn)
-			statusCode = http.StatusBadRequest
-			return
-		}
-		// add sorting option to query
-		if i > 0 {
-			sql += ","
-		}
-		sql += fmt.Sprintf("%s %s NULLS LAST", sortColumn, sortOrder)
-	}
-	return
-}
--- a/docs/reference/backend/go.mod
+++ b/docs/reference/backend/go.mod
@ -1,19 +0,0 @@
-module tanabata
-
-go 1.23.0
-
-toolchain go1.23.10
-
-require github.com/jackc/pgx/v5 v5.7.5
-
-require (
-	github.com/jackc/pgpassfile v1.0.0 // indirect
-	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
-	github.com/jackc/pgx v3.6.2+incompatible // indirect
-	github.com/jackc/puddle/v2 v2.2.2 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
-	github.com/stretchr/testify v1.9.0 // indirect
-	golang.org/x/crypto v0.37.0 // indirect
-	golang.org/x/sync v0.13.0 // indirect
-	golang.org/x/text v0.24.0 // indirect
-)
--- a/docs/reference/backend/go.sum
+++ b/docs/reference/backend/go.sum
@ -1,32 +0,0 @@
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
-github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
-github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 h1:iCEnooe7UlwOQYpKFhBabPMi4aNAfoODPEFNiAnClxo=
-github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
-github.com/jackc/pgx v3.6.2+incompatible h1:2zP5OD7kiyR3xzRYMhOcXVvkDZsImVXfj+yIyTQf3/o=
-github.com/jackc/pgx v3.6.2+incompatible/go.mod h1:0ZGrqGqkRlliWnWB4zKnWtjbSWbGkVEFm4TeybAXq+I=
-github.com/jackc/pgx/v5 v5.7.5 h1:JHGfMnQY+IEtGM63d+NGMjoRpysB2JBwDr5fsngwmJs=
-github.com/jackc/pgx/v5 v5.7.5/go.mod h1:aruU7o91Tc2q2cFp5h4uP3f6ztExVpyVv88Xl/8Vl8M=
-github.com/jackc/puddle/v2 v2.2.2 h1:PR8nw+E/1w0GLuRFSmiioY6UooMp6KJv0/61nB7icHo=
-github.com/jackc/puddle/v2 v2.2.2/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
-github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
-github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
-github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-golang.org/x/crypto v0.37.0 h1:kJNSjF/Xp7kU0iB2Z+9viTPMW4EqqsrywMXLJOOsXSE=
-golang.org/x/crypto v0.37.0/go.mod h1:vg+k43peMZ0pUMhYmVAWysMK35e6ioLh3wB8ZCAfbVc=
-golang.org/x/sync v0.13.0 h1:AauUjRAJ9OSnvULf/ARrrVywoJDy0YS2AwQ98I37610=
-golang.org/x/sync v0.13.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
-golang.org/x/text v0.24.0 h1:dd5Bzh4yt5KYA8f9CJHCP4FB4D51c2c6JvN37xJJkJ0=
-golang.org/x/text v0.24.0/go.mod h1:L8rBsPeo2pSS+xqN0d5u2ikmjtmoJbDBT1b7nHvFCdU=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
--- a/docs/reference/backend/internal/storage/postgres/auth.go
+++ b/docs/reference/backend/internal/storage/postgres/auth.go
@ -1,16 +0,0 @@
-package postgres
-
-import "context"
-
-func UserLogin(ctx context.Context, name, password string) (user_id int, err error) {
-	row := connPool.QueryRow(ctx, "SELECT id FROM users WHERE name=$1 AND password=crypt($2, password)", name, password)
-	err = row.Scan(&user_id)
-	return
-}
-
-func UserAuth(ctx context.Context, user_id int) (ok, isAdmin bool) {
-	row := connPool.QueryRow(ctx, "SELECT is_admin FROM users WHERE id=$1", user_id)
-	err := row.Scan(&isAdmin)
-	ok = (err == nil)
-	return
-}
--- a/docs/reference/backend/internal/storage/postgres/file.go
+++ b/docs/reference/backend/internal/storage/postgres/file.go
@ -1,268 +0,0 @@
-package postgres
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"net/http"
-	"time"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-
-	"tanabata/internal/domain"
-)
-
-type FileStore struct {
-	db *pgxpool.Pool
-}
-
-func NewFileStore(db *pgxpool.Pool) *FileStore {
-	return &FileStore{db: db}
-}
-
-// Get user's access rights to file
-func (s *FileStore) getAccess(user_id int, file_id string) (canView, canEdit bool, err error) {
-	ctx := context.Background()
-	row := connPool.QueryRow(ctx, `
-		SELECT 
-			COALESCE(a.view, FALSE) OR f.creator_id=$1 OR COALESCE(u.is_admin, FALSE),
-			COALESCE(a.edit, FALSE) OR f.creator_id=$1 OR COALESCE(u.is_admin, FALSE)
-		FROM data.files f
-		LEFT JOIN acl.files a ON a.file_id=f.id AND a.user_id=$1
-		LEFT JOIN system.users u ON u.id=$1
-		WHERE f.id=$2
-		`, user_id, file_id)
-	err = row.Scan(&canView, &canEdit)
-	return
-}
-
-// Get a set of files
-func (s *FileStore) GetSlice(user_id int, filter, sort string, limit, offset int) (files domain.Slice[domain.FileItem], statusCode int, err error) {
-	filterCond, statusCode, err := filterToSQL(filter)
-	if err != nil {
-		return
-	}
-	sortExpr, statusCode, err := sortToSQL(sort)
-	if err != nil {
-		return
-	}
-	// prepare query
-	query := `
-	SELECT
-		f.id,
-		f.name,
-		m.name,
-		m.extension,
-		uuid_extract_timestamp(f.id),
-		u.name,
-		u.is_admin
-	FROM data.files f
-	JOIN system.mime m ON m.id=f.mime_id
-	JOIN system.users u ON u.id=f.creator_id
-	WHERE NOT f.is_deleted AND (f.creator_id=$1 OR (SELECT view FROM acl.files WHERE file_id=f.id AND user_id=$1) OR (SELECT is_admin FROM system.users WHERE id=$1)) AND
-	`
-	query += filterCond
-	queryCount := query
-	query += sortExpr
-	if limit >= 0 {
-		query += fmt.Sprintf(" LIMIT %d", limit)
-	}
-	if offset > 0 {
-		query += fmt.Sprintf(" OFFSET %d", offset)
-	}
-	// execute query
-	statusCode, err = transaction(func(ctx context.Context, tx pgx.Tx) (statusCode int, err error) {
-		rows, err := tx.Query(ctx, query, user_id)
-		if err != nil {
-			statusCode, err = handleDBError(err)
-			return
-		}
-		defer rows.Close()
-		count := 0
-		for rows.Next() {
-			var file domain.FileItem
-			err = rows.Scan(&file.ID, &file.Name, &file.MIME.Name, &file.MIME.Extension, &file.CreatedAt, &file.Creator.Name, &file.Creator.IsAdmin)
-			if err != nil {
-				statusCode = http.StatusInternalServerError
-				return
-			}
-			files.Data = append(files.Data, file)
-			count++
-		}
-		err = rows.Err()
-		if err != nil {
-			statusCode = http.StatusInternalServerError
-			return
-		}
-		files.Pagination.Limit = limit
-		files.Pagination.Offset = offset
-		files.Pagination.Count = count
-		row := tx.QueryRow(ctx, fmt.Sprintf("SELECT COUNT(*) FROM (%s) tmp", queryCount), user_id)
-		err = row.Scan(&files.Pagination.Total)
-		if err != nil {
-			statusCode = http.StatusInternalServerError
-		}
-		return
-	})
-	if err == nil {
-		statusCode = http.StatusOK
-	}
-	return
-}
-
-// Get file
-func (s *FileStore) Get(user_id int, file_id string) (file domain.FileFull, statusCode int, err error) {
-	ctx := context.Background()
-	row := connPool.QueryRow(ctx, `
-		SELECT
-			f.id,
-			f.name,
-			m.name,
-			m.extension,
-			uuid_extract_timestamp(f.id),
-			u.name,
-			u.is_admin,
-			f.notes,
-			f.metadata,
-			(SELECT COUNT(*) FROM activity.file_views fv WHERE fv.file_id=$2 AND fv.user_id=$1)
-		FROM data.files f
-		JOIN system.mime m ON m.id=f.mime_id
-		JOIN system.users u ON u.id=f.creator_id
-		WHERE NOT f.is_deleted AND f.id=$2 AND (f.creator_id=$1 OR (SELECT view FROM acl.files WHERE file_id=$2 AND user_id=$1) OR (SELECT is_admin FROM system.users WHERE id=$1))
-		`, user_id, file_id)
-	err = row.Scan(&file.ID, &file.Name, &file.MIME.Name, &file.MIME.Extension, &file.CreatedAt, &file.Creator.Name, &file.Creator.IsAdmin, &file.Notes, &file.Metadata, &file.Viewed)
-	if err != nil {
-		statusCode, err = handleDBError(err)
-		return
-	}
-	rows, err := connPool.Query(ctx, `
-		SELECT
-			t.id,
-			t.name,
-			COALESCE(t.color, c.color)
-		FROM data.tags t
-		LEFT JOIN data.categories c ON c.id=t.category_id
-		JOIN data.file_tag ft ON ft.tag_id=t.id
-		WHERE ft.file_id=$1
-		`, file_id)
-	if err != nil {
-		statusCode, err = handleDBError(err)
-		return
-	}
-	defer rows.Close()
-	for rows.Next() {
-		var tag domain.TagCore
-		err = rows.Scan(&tag.ID, &tag.Name, &tag.Color)
-		if err != nil {
-			statusCode = http.StatusInternalServerError
-			return
-		}
-		file.Tags = append(file.Tags, tag)
-	}
-	err = rows.Err()
-	if err != nil {
-		statusCode = http.StatusInternalServerError
-		return
-	}
-	statusCode = http.StatusOK
-	return
-}
-
-// Add file
-func (s *FileStore) Add(user_id int, name, mime string, datetime time.Time, notes string, metadata json.RawMessage) (file domain.FileCore, statusCode int, err error) {
-	ctx := context.Background()
-	var mime_id int
-	var extension string
-	row := connPool.QueryRow(ctx, "SELECT id, extension FROM system.mime WHERE name=$1", mime)
-	err = row.Scan(&mime_id, &extension)
-	if err != nil {
-		if err == pgx.ErrNoRows {
-			err = fmt.Errorf("unsupported file type: %q", mime)
-			statusCode = http.StatusBadRequest
-		} else {
-			statusCode, err = handleDBError(err)
-		}
-		return
-	}
-	row = connPool.QueryRow(ctx, `
-	INSERT INTO data.files (name, mime_id, datetime, creator_id, notes, metadata)
-	VALUES (NULLIF($1, ''), $2, $3, $4, NULLIF($5 ,''), $6)
-	RETURNING id
-	`, name, mime_id, datetime, user_id, notes, metadata)
-	err = row.Scan(&file.ID)
-	if err != nil {
-		statusCode, err = handleDBError(err)
-		return
-	}
-	file.Name.String = name
-	file.Name.Valid = (name != "")
-	file.MIME.Name = mime
-	file.MIME.Extension = extension
-	statusCode = http.StatusOK
-	return
-}
-
-// Update file
-func (s *FileStore) Update(user_id int, file_id string, updates map[string]interface{}) (statusCode int, err error) {
-	if len(updates) == 0 {
-		err = fmt.Errorf("no fields provided for update")
-		statusCode = http.StatusBadRequest
-		return
-	}
-	writableFields := map[string]bool{
-		"name":     true,
-		"datetime": true,
-		"notes":    true,
-		"metadata": true,
-	}
-	query := "UPDATE data.files SET"
-	newValues := []interface{}{user_id}
-	count := 2
-	for field, value := range updates {
-		if !writableFields[field] {
-			err = fmt.Errorf("invalid field: %q", field)
-			statusCode = http.StatusBadRequest
-			return
-		}
-		query += fmt.Sprintf(" %s=NULLIF($%d, '')", field, count)
-		newValues = append(newValues, value)
-		count++
-	}
-	query += fmt.Sprintf(
-		" WHERE id=$%d AND (creator_id=$1 OR (SELECT edit FROM acl.files WHERE file_id=$%d AND user_id=$1) OR (SELECT is_admin FROM system.users WHERE id=$1))",
-		count, count)
-	newValues = append(newValues, file_id)
-	ctx := context.Background()
-	commandTag, err := connPool.Exec(ctx, query, newValues...)
-	if err != nil {
-		statusCode, err = handleDBError(err)
-		return
-	}
-	if commandTag.RowsAffected() == 0 {
-		err = fmt.Errorf("not found")
-		statusCode = http.StatusNotFound
-		return
-	}
-	statusCode = http.StatusNoContent
-	return
-}
-
-// Delete file
-func (s *FileStore) Delete(user_id int, file_id string) (statusCode int, err error) {
-	ctx := context.Background()
-	commandTag, err := connPool.Exec(ctx,
-		"DELETE FROM data.files WHERE id=$2 AND (creator_id=$1 OR (SELECT edit FROM acl.files WHERE file_id=$2 AND user_id=$1) OR (SELECT is_admin FROM system.users WHERE id=$1))",
-		user_id, file_id)
-	if err != nil {
-		statusCode, err = handleDBError(err)
-		return
-	}
-	if commandTag.RowsAffected() == 0 {
-		err = fmt.Errorf("not found")
-		statusCode = http.StatusNotFound
-		return
-	}
-	statusCode = http.StatusNoContent
-	return
-}
--- a/docs/reference/backend/internal/storage/postgres/store.go
+++ b/docs/reference/backend/internal/storage/postgres/store.go
@ -1,92 +0,0 @@
-package postgres
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"net/http"
-	"time"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgconn"
-	"github.com/jackc/pgx/v5/pgxpool"
-)
-
-type Storage struct {
-	db *pgxpool.Pool
-}
-
-var connPool *pgxpool.Pool
-
-// Initialize new database storage
-func New(dbURL string) (*Storage, error) {
-	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
-	defer cancel()
-	config, err := pgxpool.ParseConfig(dbURL)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse DB URL: %w", err)
-	}
-	config.MaxConns = 10
-	config.MinConns = 2
-	config.HealthCheckPeriod = time.Minute
-	db, err := pgxpool.NewWithConfig(ctx, config)
-	if err != nil {
-		return nil, fmt.Errorf("failed to connect to database: %w", err)
-	}
-	err = db.Ping(ctx)
-	if err != nil {
-		return nil, fmt.Errorf("database ping failed: %w", err)
-	}
-	return &Storage{db: db}, nil
-}
-
-// Close database storage
-func (s *Storage) Close() {
-	s.db.Close()
-}
-
-// Run handler inside transaction
-func (s *Storage) transaction(ctx context.Context, handler func(context.Context, pgx.Tx) (statusCode int, err error)) (statusCode int, err error) {
-	tx, err := connPool.Begin(ctx)
-	if err != nil {
-		statusCode = http.StatusInternalServerError
-		return
-	}
-	statusCode, err = handler(ctx, tx)
-	if err != nil {
-		tx.Rollback(ctx)
-		return
-	}
-	err = tx.Commit(ctx)
-	if err != nil {
-		statusCode = http.StatusInternalServerError
-	}
-	return
-}
-
-// Handle database error
-func (s *Storage) handleDBError(errIn error) (statusCode int, err error) {
-	if errIn == nil {
-		statusCode = http.StatusOK
-		return
-	}
-	if errors.Is(errIn, pgx.ErrNoRows) {
-		err = fmt.Errorf("not found")
-		statusCode = http.StatusNotFound
-		return
-	}
-	var pgErr *pgconn.PgError
-	if errors.As(errIn, &pgErr) {
-		switch pgErr.Code {
-		case "22P02", "22007": // Invalid data format
-			err = fmt.Errorf("%s", pgErr.Message)
-			statusCode = http.StatusBadRequest
-			return
-		case "23505": // Unique constraint violation
-			err = fmt.Errorf("already exists")
-			statusCode = http.StatusConflict
-			return
-		}
-	}
-	return http.StatusInternalServerError, errIn
-}
--- a/docs/reference/backend/internal/storage/storage.go
+++ b/docs/reference/backend/internal/storage/storage.go
@ -1,21 +0,0 @@
-package storage
-
-import (
-	"encoding/json"
-	"time"
-
-	"tanabata/internal/domain"
-)
-
-type Storage interface {
-	FileRepository
-	Close()
-}
-
-type FileRepository interface {
-	GetSlice(user_id int, filter, sort string, limit, offset int) (files domain.Slice[domain.FileItem], statusCode int, err error)
-	Get(user_id int, file_id string) (file domain.FileFull, statusCode int, err error)
-	Add(user_id int, name, mime string, datetime time.Time, notes string, metadata json.RawMessage) (file domain.FileCore, statusCode int, err error)
-	Update(user_id int, file_id string, updates map[string]interface{}) (statusCode int, err error)
-	Delete(user_id int, file_id string) (statusCode int, err error)
-}
--- a/docs/reference/backend/models/models.go
+++ b/docs/reference/backend/models/models.go
@ -1,120 +0,0 @@
-package models
-
-import (
-	"encoding/json"
-	"time"
-
-	"github.com/jackc/pgx/v5/pgtype"
-)
-
-type User struct {
-	Name      string `json:"name"`
-	IsAdmin   bool   `json:"isAdmin"`
-	CanCreate bool   `json:"canCreate"`
-}
-
-type MIME struct {
-	Name      string `json:"name"`
-	Extension string `json:"extension"`
-}
-
-type (
-	CategoryCore struct {
-		ID    string      `json:"id"`
-		Name  string      `json:"name"`
-		Color pgtype.Text `json:"color"`
-	}
-	CategoryItem struct {
-		CategoryCore
-	}
-	CategoryFull struct {
-		CategoryCore
-		CreatedAt time.Time   `json:"createdAt"`
-		Creator   User        `json:"creator"`
-		Notes     pgtype.Text `json:"notes"`
-	}
-)
-
-type (
-	FileCore struct {
-		ID   string      `json:"id"`
-		Name pgtype.Text `json:"name"`
-		MIME MIME        `json:"mime"`
-	}
-	FileItem struct {
-		FileCore
-		CreatedAt time.Time `json:"createdAt"`
-		Creator   User      `json:"creator"`
-	}
-	FileFull struct {
-		FileCore
-		CreatedAt time.Time       `json:"createdAt"`
-		Creator   User            `json:"creator"`
-		Notes     pgtype.Text     `json:"notes"`
-		Metadata  json.RawMessage `json:"metadata"`
-		Tags      []TagCore       `json:"tags"`
-		Viewed    int             `json:"viewed"`
-	}
-)
-
-type (
-	TagCore struct {
-		ID    string      `json:"id"`
-		Name  string      `json:"name"`
-		Color pgtype.Text `json:"color"`
-	}
-	TagItem struct {
-		TagCore
-		Category CategoryCore `json:"category"`
-	}
-	TagFull struct {
-		TagCore
-		Category  CategoryCore `json:"category"`
-		CreatedAt time.Time    `json:"createdAt"`
-		Creator   User         `json:"creator"`
-		Notes     pgtype.Text  `json:"notes"`
-	}
-)
-
-type Autotag struct {
-	TriggerTag TagCore `json:"triggerTag"`
-	AddTag     TagCore `json:"addTag"`
-	IsActive   bool    `json:"isActive"`
-}
-
-type (
-	PoolCore struct {
-		ID   string `json:"id"`
-		Name string `json:"name"`
-	}
-	PoolItem struct {
-		PoolCore
-	}
-	PoolFull struct {
-		PoolCore
-		CreatedAt time.Time   `json:"createdAt"`
-		Creator   User        `json:"creator"`
-		Notes     pgtype.Text `json:"notes"`
-		Viewed    int         `json:"viewed"`
-	}
-)
-
-type Session struct {
-	ID           int       `json:"id"`
-	UserAgent    string    `json:"userAgent"`
-	StartedAt    time.Time `json:"startedAt"`
-	ExpiresAt    time.Time `json:"expiresAt"`
-	LastActivity time.Time `json:"lastActivity"`
-}
-
-type Pagination struct {
-	Total  int `json:"total"`
-	Offset int `json:"offset"`
-	Limit  int `json:"limit"`
-	Count  int `json:"count"`
-}
-
-type Slice[T any] struct {
-	Pagination Pagination `json:"pagination"`
-	Data       []T        `json:"data"`
-}
--- a/docs/reference/web/static/css/auth.css
+++ b/docs/reference/web/static/css/auth.css
@ -1,36 +0,0 @@
-body {
-	justify-content: center;
-	align-items: center;
-}
-
-.decoration {
-	position: absolute;
-	top: 0;
-}
-
-.decoration.left {
-	left: 0;
-	width: 20vw;
-}
-
-.decoration.right {
-	right: 0;
-	width: 20vw;
-}
-
-#auth {
-	max-width: 100%;
-}
-
-#auth h1 {
-	margin-bottom: 28px;
-}
-
-#auth .form-control {
-	margin: 14px 0;
-	border-radius: 14px;
-}
-
-#login {
-	margin-top: 20px;
-}
--- a/docs/reference/web/static/css/general.css
+++ b/docs/reference/web/static/css/general.css
@ -1,54 +0,0 @@
-html, body {
-	margin: 0;
-	padding: 0;
-}
-
-body {
-	background-color: #312F45;
-	color: #f0f0f0;
-	position: absolute;
-	top: 0;
-	left: 0;
-	bottom: 0;
-	right: 0;
-	min-height: 100vh;
-	display: flex;
-	flex-direction: column;
-	justify-content: space-between;
-	align-items: stretch;
-	font-family: Epilogue;
-	overflow-x: hidden;
-}
-
-.btn {
-	height: 50px;
-	width: 100%;
-	border-radius: 14px;
-	font-size: 1.5rem;
-	font-weight: 500;
-}
-
-.btn-primary {
-	background-color: #9592B5;
-	border-color: #454261;
-}
-
-.btn-primary:hover {
-	background-color: #7D7AA4;
-	border-color: #454261;
-}
-
-.btn-danger {
-	background-color: #DB6060;
-	border-color: #851E1E;
-}
-
-.btn-danger:hover {
-	background-color: #D64848;
-	border-color: #851E1E;
-}
-
-.btn-row {
-	display: flex;
-	justify-content: space-between;
-}
--- a/docs/reference/web/static/css/interface.css
+++ b/docs/reference/web/static/css/interface.css
@ -1,388 +0,0 @@
-header, footer {
-	margin: 0;
-	padding: 10px;
-	box-sizing: border-box;
-}
-
-header {
-	padding: 20px;
-	box-shadow: 0 5px 5px #0004;
-}
-
-.icon-header {
-	height: .8em;
-}
-
-#select {
-	cursor: pointer;
-}
-
-.sorting {
-	position: relative;
-	display: flex;
-	justify-content: space-between;
-}
-
-#sorting {
-	cursor: pointer;
-}
-
-.highlighted {
-	color: #9999AD;
-}
-
-#icon-expand {
-	height: 10px;
-}
-
-#sorting-options {
-	position: absolute;
-	right: 0;
-	top: 114%;
-	padding: 4px 10px;
-	box-sizing: border-box;
-	background-color: #111118;
-	border-radius: 10px;
-	text-align: left;
-	box-shadow: 0 0 10px black;
-	z-index: 9999;
-}
-
-.sorting-option {
-	padding: 4px 0;
-	display: flex;
-	justify-content: space-between;
-}
-
-.sorting-option input[type="radio"] {
-	float: unset;
-	margin-left: 1.8em;
-}
-
-.filtering-wrapper {
-	margin-top: 10px;
-}
-
-.filtering-block {
-	position: absolute;
-	top: 128px;
-	left: 14px;
-	right: 14px;
-	padding: 14px;
-	background-color: #111118;
-	border-radius: 10px;
-	box-shadow: 0 0 10px 4px #0004;
-	z-index: 9998;
-}
-
-main {
-	margin: 0;
-	padding: 10px;
-	height: 100%;
-	display: flex;
-	justify-content: space-between;
-	align-content: flex-start;
-	align-items: flex-start;
-	flex-wrap: wrap;
-	box-sizing: border-box;
-	overflow-x: hidden;
-	overflow-y: scroll;
-}
-
-main:after {
-	content: "";
-	flex: auto;
-}
-
-.item-preview {
-	position: relative;
-}
-
-.item-selected:after {
-	content: "";
-	display: block;
-	position: absolute;
-	top: 10px;
-	right: 10px;
-	width: 100%;
-	height: 50%;
-	background-image: url("/static/images/icon-select.svg");
-	background-size: contain;
-	background-position: right;
-	background-repeat: no-repeat;
-}
-
-.file-preview {
-	margin: 1px 0;
-	padding: 0;
-	width: 160px;
-	height: 160px;
-	max-width: calc(33vw - 7px);
-	max-height: calc(33vw - 7px);
-	overflow: hidden;
-	cursor: pointer;
-}
-
-.file-thumb {
-	width: 100%;
-	height: 100%;
-	object-fit: contain;
-	object-position: center;
-}
-
-.file-preview .overlay {
-	position: absolute;
-	top: 0;
-	right: 0;
-	bottom: 0;
-	left: 0;
-	background-color: #0002;
-}
-
-.file-preview:hover .overlay {
-	background-color: #0004;
-}
-
-.tag-preview, .filtering-token {
-	margin: 5px 5px;
-	padding: 5px 10px;
-	border-radius: 5px;
-	background-color: #444455;
-	cursor: pointer;
-}
-
-.category-preview {
-	margin: 5px 5px;
-	padding: 5px 10px;
-	border-radius: 5px;
-	background-color: #444455;
-	cursor: pointer;
-}
-
-.file {
-	margin: 0;
-	padding: 0;
-	min-width: 100vw;
-	min-height: 100vh;
-	max-width: 100vw;
-	max-height: 100vh;
-	display: flex;
-	justify-content: center;
-	align-items: center;
-	background-color: black;
-}
-
-.file .preview-img {
-	max-width: 100vw;
-	max-height: 100vh;
-}
-
-.selection-manager {
-	position: fixed;
-	left: 10px;
-	right: 10px;
-	bottom: 65px;
-	box-sizing: border-box;
-	max-height: 40vh;
-	display: flex;
-	flex-direction: column;
-	padding: 15px 10px;
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--- a/Show More
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