fix(frontend): open original only when tapping the preview image

The preview area was one big link, so a click anywhere in it — including
the black letterbox margins — opened the original. Make the link
pointer-events:none and re-enable pointer-events on the image itself, so
"open original" fires only on the image, not the surrounding margins.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.env.example

@@ -14,7 +14,10 @@
 # DATABASE_URL at host.docker.internal (see the Database section below).
 COMPOSE_PROFILES=with-db
 
-# Host port the app is published on. The container always listens on 42776.
+# Host port the app is published on, bound to 127.0.0.1 (loopback) — a reverse
+# proxy on the host fronts it (see README → Reverse proxy). The container always
+# listens on 42776. To expose the app directly without a proxy, drop the
+# "127.0.0.1:" prefix on the ports line in docker-compose.yml.
 APP_PORT=42776
 
 # ---------------------------------------------------------------------------
@@ -51,6 +54,30 @@ JWT_SECRET=change-me-to-a-random-32-byte-secret
 JWT_ACCESS_TTL=15m
 JWT_REFRESH_TTL=720h
 
+# How long a content token is valid. It's a single-file capability the client
+# puts in a media URL to open/stream an original by link (e.g. a long video in a
+# new tab), so playback survives the short access-token expiry and session
+# rotation. Longer = fewer interruptions but a wider window in which a leaked URL
+# can read that one file; it can't be revoked before expiry. Keep it roughly as
+# long as a viewing session lasts.
+CONTENT_TOKEN_TTL=6h
+
+# How long a graceful shutdown waits for in-flight requests to finish after the
+# app receives SIGTERM/SIGINT (e.g. on `docker compose up --build`, which
+# recreates the container). This SAME value is fed to the container's
+# `stop_grace_period` in docker-compose.yml, so Docker won't SIGKILL the app
+# mid-drain — set it in one place here and both stay in sync. A single upload or
+# video stream that outlasts this window is still cut; raise it if you routinely
+# move very large files. Accepts Go/Compose durations (s, m, h).
+SHUTDOWN_TIMEOUT=15s
+
+# Reverse-proxy hops (comma-separated CIDRs/IPs) whose X-Forwarded-For is trusted,
+# so the auth rate limiter sees real client IPs instead of the proxy's. The default
+# covers loopback and the Docker bridge ranges a host nginx reaches the container
+# through; widen/narrow it to match your proxy. Leave at the default for the
+# standard "host nginx → 127.0.0.1" setup.
+TRUSTED_PROXIES=127.0.0.1/32,::1/128,172.16.0.0/12
+
 # Initial administrator, created on first startup if it does not yet exist.
 # Changing the password later (via the API) is preserved across restarts.
 ADMIN_USERNAME=admin
@@ -92,12 +119,34 @@ THUMB_WIDTH=160
 THUMB_HEIGHT=160
 PREVIEW_WIDTH=1920
 PREVIEW_HEIGHT=1080
+# Pixel cap (width×height) for the pure-Go fallback decoder, used only when
+# vipsthumbnail is NOT installed; larger images then get a placeholder. With vips
+# present (the default image) thumbnails shrink on load, so this limit — and its
+# RAM cost — don't apply. Also bounds a decompression bomb. Default ~300 Mpx.
+THUMB_MAX_PIXELS=300000000
+# How many thumbnails/previews may be generated at once. Each resize already uses
+# every core, so a burst of large images otherwise pegs the CPU and RAM. 0 = auto
+# (half the available CPUs).
+THUMB_CONCURRENCY=0
 
 # ---------------------------------------------------------------------------
 # Import
 # ---------------------------------------------------------------------------
 IMPORT_PATH=/data/import
 
+# ---------------------------------------------------------------------------
+# Duplicate detection
+# ---------------------------------------------------------------------------
+# Maximum perceptual-hash distance (Hamming, out of 64 bits) for two files to be
+# treated as duplicate candidates. Lower = stricter (fewer, more confident
+# matches); higher = looser (catches more re-encodes/resizes but risks false
+# positives). On real libraries the distance histogram climbs steeply in the 8–10
+# band — coincidental "vaguely similar" pairs, not duplicates — so 4 keeps the
+# genuine-duplicate signal without that noise (and far fewer pairs to cluster).
+# Used only by the dedup tool's pairs rebuild — see the dedup CLI /
+# `docker compose run --rm dedup`. Code default is 10.
+DUPLICATE_HASH_THRESHOLD=4
+
 # ---------------------------------------------------------------------------
 # Static SPA
 # ---------------------------------------------------------------------------

.gitea/workflows/deploy.yml

@@ -19,7 +19,9 @@ jobs:
     # existing clone in /opt/tanabata. See docs/DEPLOY.md for runner setup.
     #
     # Only shell steps here (no `uses:` actions), so the host needs git + docker
-    # and nothing else — no node, no rsync.
+    # and nothing else — no node, no go, no rsync. The test step below runs the
+    # Go and Node toolchains inside throwaway containers, so nothing has to be
+    # installed on the host.
     runs-on: host
 
     env:
@@ -35,6 +37,47 @@ jobs:
           git fetch --prune origin
           git reset --hard origin/master
 
+      - name: Run tests
+        working-directory: /opt/tanabata
+        # Everything runs INSIDE throwaway toolchain containers — the host only
+        # needs docker (which it already uses for `docker compose`). Nothing (Go,
+        # Node, Postgres, vips/ffmpeg/exiftool) has to be installed on the host.
+        # The orchestration below uses only bash builtins + docker. A failure here
+        # fails the job, so a red build never reaches production. Module/npm caches
+        # persist in named volumes for speed.
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          docker rm -f tfm-ci-db >/dev/null 2>&1 || true
+          docker network rm tfm-ci-net >/dev/null 2>&1 || true
+          docker network create tfm-ci-net >/dev/null
+          trap 'docker rm -f tfm-ci-db >/dev/null 2>&1 || true; docker network rm tfm-ci-net >/dev/null 2>&1 || true' EXIT
+
+          docker run -d --name tfm-ci-db --network tfm-ci-net \
+            -e POSTGRES_PASSWORD=postgres postgres:14-alpine >/dev/null
+          # Wait for Postgres, using pg_isready inside the DB container (no host tools).
+          for ((i = 0; i < 30; i++)); do
+            docker exec tfm-ci-db pg_isready -U postgres >/dev/null 2>&1 && break
+            sleep 1
+          done
+
+          # Backend: full suite, including the integration tests, against the
+          # ephemeral Postgres. -buildvcs=false since the .git dir isn't mounted.
+          docker run --rm --network tfm-ci-net \
+            -v /opt/tanabata/backend:/src -w /src \
+            -v tfm-ci-gomod:/go/pkg/mod -v tfm-ci-gocache:/root/.cache/go-build \
+            -e CGO_ENABLED=0 \
+            -e TANABATA_TEST_ADMIN_DSN="postgres://postgres:postgres@tfm-ci-db:5432/postgres?sslmode=disable" \
+            golang:1.26-alpine go test -buildvcs=false -count=1 ./...
+
+          # Frontend: type-check + production build (also validates openapi via
+          # the generate:types prestep).
+          docker run --rm \
+            -v /opt/tanabata:/repo -w /repo/frontend \
+            -v tfm-ci-npm:/root/.npm \
+            node:22-alpine sh -c "npm ci && npm run check && npm run build"
+
       - name: Build image and start the stack
         working-directory: /opt/tanabata
         # .env must already exist in DEPLOY_DIR on the host (secrets + DB mode).

CLAUDE.md

@@ -13,16 +13,18 @@ Monorepo: `backend/` (Go) + `frontend/` (SvelteKit).
 
 ## Key documents (read before coding)
 
-- `openapi.yaml` — full REST API specification (36 paths, 58 operations)
+- `openapi.yaml` — full REST API specification (44 paths, 67 operations)
+- `docs/REQUIREMENTS.md` — product requirements (functional + non-functional)
+- `docs/ARCHITECTURE.md` — system architecture overview (layers, data flow, decisions)
 - `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/` — database schema as goose migrations (4 schemas, 19 tables)
-- `backend/migrations/001_init.sql` — database schema (4 schemas, 16 tables)
 
 ## Design reference
 
-The `docs/reference/` directory contains the previous Python/Flask version.
+Visual design tokens for the frontend (carried over from the previous
-Use its visual design as the basis for the new frontend:
+Python/Flask version):
+
 - Color palette: #312F45 (bg), #9592B5 (accent), #444455 (tag default), #111118 (elevated)
 - Font: Epilogue (variable weight)
 - Dark theme is primary
@@ -32,6 +34,7 @@ Use its visual design as the basis for the new frontend:
 - Floating selection bar for multi-select
 
 ## Backend commands
+
 ```bash
 cd backend
 go run ./cmd/server          # run dev server
@@ -39,6 +42,7 @@ go test ./...                # run all tests
 ```
 
 ## Frontend commands
+
 ```bash
 cd frontend
 npm run dev                  # vite dev server
@@ -55,4 +59,4 @@ npm run generate:types       # regenerate API types from openapi.yaml
 - 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)
+  - `(project)` for root-level files (.gitignore, docs, structure)

Dockerfile

@@ -1,5 +1,3 @@
-# syntax=docker/dockerfile:1
-
 # =============================================================================
 # Tanabata File Manager — single-image build
 #
@@ -41,23 +39,28 @@ RUN go mod download
 
 COPY backend/ ./
 
-# CGO is disabled: image processing is pure Go (disintegration/imaging) and
+# CGO is disabled: the binary shells out to external tools at runtime
-# video thumbnails shell out to the ffmpeg binary at runtime, so the resulting
+# (vipsthumbnail for image thumbnails, ffmpeg for video frames, exiftool for
-# binary is fully static and portable across base images.
+# metadata) and falls back to pure-Go image processing (disintegration/imaging)
+# when vips is absent, so it stays fully static and portable across base images.
 RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /out/server ./cmd/server
+# dedup: offline maintenance CLI for duplicate detection (hash backfill + pairs
+# rescan). Shipped alongside the server so it can be run with `docker exec`.
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /out/dedup ./cmd/dedup
 
 # -----------------------------------------------------------------------------
 # Stage 3 — minimal runtime
 #
-# Alpine (not distroless/scratch) because video thumbnailing invokes ffmpeg and
+# Alpine (not distroless/scratch) because thumbnailing and metadata extraction
-# metadata extraction invokes exiftool as external processes; both must be
+# invoke external processes (vipsthumbnail, ffmpeg, exiftool) that must be present
-# present on the runtime image.
+# on the runtime image.
 # -----------------------------------------------------------------------------
 FROM alpine:3.21 AS runtime
 
-# ffmpeg: video frame extraction. exiftool: rich image/video/audio metadata.
+# vips-tools: fast, low-memory image thumbnails (shrink-on-load, so multi-hundred-
+# Mpx photos cost little). ffmpeg: video frame extraction. exiftool: rich metadata.
 # ca-certificates/tzdata: TLS + time zones.
-RUN apk add --no-cache ffmpeg exiftool ca-certificates tzdata
+RUN apk add --no-cache vips-tools ffmpeg exiftool ca-certificates tzdata
 
 # Run as an unprivileged user.
 RUN addgroup -S -g 42776 tanabata && adduser -S -G tanabata -u 42776 tanabata
@@ -68,6 +71,8 @@ WORKDIR /app
 COPY --from=frontend --chown=tanabata:tanabata /src/frontend/build /app/static
 # The server binary.
 COPY --from=backend --chown=tanabata:tanabata /out/server /app/server
+# The dedup maintenance CLI (run via `docker exec`, not the entrypoint).
+COPY --from=backend --chown=tanabata:tanabata /out/dedup /app/dedup
 
 # Data directories (overridable via FILES_PATH/THUMBS_CACHE_PATH/IMPORT_PATH).
 # Created and owned by the tanabata user so a fresh named volume inherits write access.

LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
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+
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+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
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+you this License which gives you legal permission to copy, distribute
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+  13. Remote Network Interaction; Use with the GNU General Public License.
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+
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+
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+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -0,0 +1,105 @@
+# Tanabata File Manager
+
+A multi-user, tag-based web file manager for images and video. Go + Gin backend
+(Clean Architecture, pgx, goose migrations), SvelteKit SPA frontend, PostgreSQL,
+JWT auth — shipped as a single Docker image that serves both the API and the
+built SPA on one port.
+
+## Documentation
+
+- [`openapi.yaml`](openapi.yaml) — full REST API specification
+- [`docs/REQUIREMENTS.md`](docs/REQUIREMENTS.md) — product requirements
+- [`docs/ARCHITECTURE.md`](docs/ARCHITECTURE.md) — system architecture overview
+- [`docs/DEPLOY.md`](docs/DEPLOY.md) — production deploy (Gitea Actions → host)
+- [`docs/GO_PROJECT_STRUCTURE.md`](docs/GO_PROJECT_STRUCTURE.md) — backend architecture
+- [`docs/FRONTEND_STRUCTURE.md`](docs/FRONTEND_STRUCTURE.md) — frontend architecture
+- [`.env.example`](.env.example) — every configuration variable, documented
+
+## Quick start
+
+```bash
+cp .env.example .env        # then edit the secrets (JWT_SECRET, ADMIN_PASSWORD, …)
+docker compose up -d --build
+```
+
+By default this runs the app plus a bundled PostgreSQL container
+(`COMPOSE_PROFILES=with-db`). To point at a Postgres already on the host, set
+`COMPOSE_PROFILES=` empty and aim `DATABASE_URL` at `host.docker.internal`. See
+[`.env.example`](.env.example) for the full matrix.
+
+The app is published on **127.0.0.1** only and expects a reverse proxy in front
+(see below). The default port is **42776** — the sum of the Unicode code points
+of 七夕.
+
+## Reverse proxy (nginx)
+
+The container publishes its port on loopback (`127.0.0.1:${APP_PORT}:42776` in
+[`docker-compose.yml`](docker-compose.yml)), so a reverse proxy on the host
+terminates TLS and forwards to it. Three settings matter for this app:
+
+1. **`client_max_body_size`** — uploads go up to `MAX_UPLOAD_BYTES` (500 MiB by
+   default). nginx caps request bodies at **1 MiB** out of the box, so without
+   this every large upload fails with `413`.
+2. **Forwarded headers** — the app trusts `X-Forwarded-For` only from the hops in
+   `TRUSTED_PROXIES` (default: loopback + Docker bridge ranges) and keys its
+   login/refresh rate limiter on the resulting client IP. If the proxy doesn't
+   send the header, every request looks like it comes from the proxy and shares
+   one rate-limit bucket.
+3. **Streaming for big media** — turning request/response buffering off lets
+   large uploads stream straight to the app and lets video range-seeks work
+   without nginx spooling whole files to disk first.
+
+```nginx
+server {
+    listen 443 ssl;
+    server_name tanabata.example.com;
+
+    # ssl_certificate / ssl_certificate_key ... (e.g. from certbot)
+
+    # Match MAX_UPLOAD_BYTES (500 MiB default); nginx defaults to 1m → 413.
+    client_max_body_size 512m;
+
+    location / {
+        proxy_pass http://127.0.0.1:42776;   # APP_PORT
+        proxy_http_version 1.1;
+
+        proxy_set_header Host              $host;
+        proxy_set_header X-Real-IP         $remote_addr;
+        proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+
+        # Stream large uploads/downloads instead of buffering to disk; keeps
+        # video range-seek responsive. Scope these to file/preview locations
+        # instead if you'd rather keep buffering for small JSON responses.
+        proxy_request_buffering off;
+        proxy_buffering         off;
+        proxy_read_timeout      300s;
+        proxy_send_timeout      300s;
+    }
+}
+```
+
+If you run the app **without** a proxy and want it reachable on the LAN, drop the
+`127.0.0.1:` prefix from the `ports` line in
+[`docker-compose.yml`](docker-compose.yml) and adjust `TRUSTED_PROXIES`
+accordingly.
+
+## Development
+
+```bash
+# Backend
+cd backend
+go run ./cmd/server          # dev server
+go test ./...                # all tests
+
+# Frontend
+cd frontend
+npm run dev                  # Vite dev server
+npm run build                # production build
+npm run generate:types       # regenerate API types from openapi.yaml
+```
+
+## License
+
+Licensed under the GNU Affero General Public License v3.0 or later
+(AGPL-3.0-or-later). See [`LICENSE`](LICENSE) for the full text.

backend/cmd/dedup/main.go

@@ -0,0 +1,217 @@
+// Command dedup is the offline maintenance tool for duplicate detection. It runs
+// in two phases:
+//
+//	hashes — compute the perceptual hash of every live image/video that has none
+//	         yet (images from their bytes, videos from a middle frame via ffmpeg).
+//	pairs  — rebuild data.duplicate_pairs from all current hashes.
+//
+// Both phases run by default; pass -hashes or -pairs to run only one. It reuses
+// the server's configuration (DATABASE_URL, FILES_PATH, THUMBS_CACHE_PATH, …) and
+// is safe to re-run: hashing only touches files whose phash is NULL, and the
+// pairs rebuild is a full replace.
+//
+//	go run ./cmd/dedup            # hashes, then pairs
+//	go run ./cmd/dedup -pairs      # only rebuild pairs
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/google/uuid"
+
+	"tanabata/backend/internal/config"
+	"tanabata/backend/internal/db/postgres"
+	"tanabata/backend/internal/imagehash"
+	"tanabata/backend/internal/service"
+	"tanabata/backend/internal/storage"
+)
+
+func main() {
+	hashesOnly := flag.Bool("hashes", false, "only (re)compute missing perceptual hashes")
+	pairsOnly := flag.Bool("pairs", false, "only rebuild the duplicate pairs table")
+	flag.Parse()
+
+	// No flag, or both, means run everything.
+	doHashes := *hashesOnly || !*pairsOnly
+	doPairs := *pairsOnly || !*hashesOnly
+
+	cfg, err := config.Load()
+	if err != nil {
+		fatal("load config", err)
+	}
+
+	ctx := context.Background()
+	pool, err := postgres.NewPool(ctx, cfg.DatabaseURL)
+	if err != nil {
+		fatal("connect to database", err)
+	}
+	defer pool.Close()
+
+	diskStorage, err := storage.NewDiskStorage(
+		cfg.FilesPath, cfg.ThumbsCachePath,
+		cfg.ThumbWidth, cfg.ThumbHeight,
+		cfg.PreviewWidth, cfg.PreviewHeight,
+		cfg.ThumbMaxPixels, cfg.ThumbConcurrency,
+	)
+	if err != nil {
+		fatal("init storage", err)
+	}
+
+	fileRepo := postgres.NewFileRepo(pool)
+	pairRepo := postgres.NewDuplicatePairRepo(pool)
+	dismissalRepo := postgres.NewDismissalRepo(pool)
+	aclRepo := postgres.NewACLRepo(pool)
+	auditRepo := postgres.NewAuditRepo(pool)
+	tagRepo := postgres.NewTagRepo(pool)
+	categoryRepo := postgres.NewCategoryRepo(pool)
+	poolRepo := postgres.NewPoolRepo(pool)
+	transactor := postgres.NewTransactor(pool)
+
+	aclSvc := service.NewACLService(aclRepo, fileRepo, tagRepo, categoryRepo, poolRepo, transactor)
+	auditSvc := service.NewAuditService(auditRepo)
+	dupSvc := service.NewDuplicateService(
+		fileRepo, pairRepo, dismissalRepo, aclSvc, auditSvc, transactor, cfg.DuplicateHashThreshold,
+	)
+
+	if doHashes {
+		if err := backfillHashes(ctx, fileRepo, diskStorage); err != nil {
+			fatal("backfill hashes", err)
+		}
+	}
+	if doPairs {
+		fmt.Printf("rebuilding duplicate pairs (threshold %d)...\n", cfg.DuplicateHashThreshold)
+		// total is only known once Rescan has loaded the hashes, so create the bar
+		// lazily on the first progress callback.
+		var prog *progress
+		if err := dupSvc.Rescan(ctx, func(done, total int) {
+			if prog == nil {
+				prog = newProgress("matching", total)
+			}
+			prog.set(done)
+		}); err != nil {
+			fatal("rescan pairs", err)
+		}
+		if prog != nil {
+			prog.finish()
+		}
+		fmt.Println("  done")
+	}
+}
+
+// backfillHashes computes and stores a perceptual hash for every live image/video
+// that lacks one. Failures on individual files are counted and reported, not
+// fatal, so one unreadable file doesn't abort the whole run.
+func backfillHashes(ctx context.Context, files *postgres.FileRepo, store *storage.DiskStorage) error {
+	pending, err := files.ListMissingPHash(ctx)
+	if err != nil {
+		return err
+	}
+	total := len(pending)
+	fmt.Printf("hashing %d files without a perceptual hash...\n", total)
+
+	var hashed, skipped, failed int
+	prog := newProgress("hashing", total)
+	for i, f := range pending {
+		ph, err := hashOne(ctx, store, f.ID, f.MIMEType)
+		switch {
+		case err != nil:
+			failed++
+			fmt.Fprintf(os.Stderr, "\n  %s (%s): %v\n", f.ID, f.MIMEType, err)
+		case ph == nil:
+			skipped++ // not decodable; leave phash NULL
+		default:
+			if err := files.SetPHash(ctx, f.ID, ph); err != nil {
+				return fmt.Errorf("set phash for %s: %w", f.ID, err)
+			}
+			hashed++
+		}
+		prog.set(i + 1)
+	}
+	prog.finish()
+	fmt.Printf("  hashed %d, skipped %d, failed %d\n", hashed, skipped, failed)
+	return nil
+}
+
+// hashOne returns the perceptual hash for one file, or nil when it isn't hashable
+// (e.g. an image that won't decode). Images are hashed from their bytes; videos
+// from a middle frame.
+func hashOne(ctx context.Context, store *storage.DiskStorage, id uuid.UUID, mime string) (*int64, error) {
+	switch {
+	case strings.HasPrefix(mime, "image/"):
+		rc, err := store.Read(ctx, id)
+		if err != nil {
+			return nil, err
+		}
+		defer rc.Close()
+		data, err := io.ReadAll(rc)
+		if err != nil {
+			return nil, err
+		}
+		if h, ok := imagehash.FromBytes(data); ok {
+			return &h, nil
+		}
+		return nil, nil
+	case strings.HasPrefix(mime, "video/"):
+		img, err := store.VideoFrameMiddle(ctx, id)
+		if err != nil {
+			return nil, err
+		}
+		h := imagehash.FromImage(img)
+		return &h, nil
+	default:
+		return nil, nil
+	}
+}
+
+// progress renders a dependency-free progress indicator. On a TTY it draws an
+// in-place bar; otherwise (pipe, cron, CI) it prints a line every 10% so logs
+// stay readable instead of filling with carriage returns.
+type progress struct {
+	label   string
+	tty     bool
+	total   int
+	lastDec int // last 10%-decile printed in non-TTY mode
+}
+
+func newProgress(label string, total int) *progress {
+	fi, _ := os.Stdout.Stat()
+	tty := fi != nil && fi.Mode()&os.ModeCharDevice != 0
+	return &progress{label: label, tty: tty, total: total, lastDec: -1}
+}
+
+func (p *progress) set(done int) {
+	if p.total <= 0 {
+		return
+	}
+	pct := done * 100 / p.total
+	if p.tty {
+		const w = 30
+		filled := done * w / p.total
+		fmt.Printf("\r  %s [%s%s] %3d%% (%d/%d)",
+			p.label,
+			strings.Repeat("#", filled), strings.Repeat("-", w-filled),
+			pct, done, p.total)
+		return
+	}
+	if dec := pct / 10; dec != p.lastDec {
+		p.lastDec = dec
+		fmt.Printf("  %s %d%% (%d/%d)\n", p.label, pct, done, p.total)
+	}
+}
+
+// finish ends the in-place bar with a newline (TTY only).
+func (p *progress) finish() {
+	if p.tty && p.total > 0 {
+		fmt.Println()
+	}
+}
+
+func fatal(what string, err error) {
+	fmt.Fprintf(os.Stderr, "dedup: %s: %v\n", what, err)
+	os.Exit(1)
+}

backend/cmd/server/main.go

@@ -2,9 +2,12 @@ package main
 
 import (
 	"context"
+	"errors"
 	"log/slog"
 	"net/http"
 	"os"
+	"os/signal"
+	"syscall"
 	"time"
 
 	"github.com/jackc/pgx/v5/stdlib"
@@ -52,6 +55,7 @@ func main() {
 		cfg.ThumbsCachePath,
 		cfg.ThumbWidth, cfg.ThumbHeight,
 		cfg.PreviewWidth, cfg.PreviewHeight,
+		cfg.ThumbMaxPixels, cfg.ThumbConcurrency,
 	)
 	if err != nil {
 		slog.Error("failed to initialise storage", "err", err)
@@ -69,6 +73,8 @@ func main() {
 	tagRuleRepo := postgres.NewTagRuleRepo(pool)
 	categoryRepo := postgres.NewCategoryRepo(pool)
 	poolRepo := postgres.NewPoolRepo(pool)
+	duplicatePairRepo := postgres.NewDuplicatePairRepo(pool)
+	dismissalRepo := postgres.NewDismissalRepo(pool)
 	transactor := postgres.NewTransactor(pool)
 
 	// Services
@@ -78,12 +84,16 @@ func main() {
 		cfg.JWTSecret,
 		cfg.JWTAccessTTL,
 		cfg.JWTRefreshTTL,
+		cfg.ContentTokenTTL,
 	)
 	aclSvc := service.NewACLService(aclRepo, fileRepo, tagRepo, categoryRepo, poolRepo, transactor)
 	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)
+	duplicateSvc := service.NewDuplicateService(
+		fileRepo, duplicatePairRepo, dismissalRepo, aclSvc, auditSvc, transactor, cfg.DuplicateHashThreshold,
+	)
 	fileSvc := service.NewFileService(
 		fileRepo,
 		mimeRepo,
@@ -105,7 +115,8 @@ func main() {
 	// Handlers
 	authMiddleware := handler.NewAuthMiddleware(authSvc)
 	authHandler := handler.NewAuthHandler(authSvc)
-	fileHandler := handler.NewFileHandler(fileSvc, tagSvc, cfg.MaxUploadBytes)
+	fileHandler := handler.NewFileHandler(fileSvc, tagSvc, authSvc, cfg.MaxUploadBytes)
+	duplicateHandler := handler.NewDuplicateHandler(duplicateSvc)
 	tagHandler := handler.NewTagHandler(tagSvc, fileSvc)
 	categoryHandler := handler.NewCategoryHandler(categorySvc)
 	poolHandler := handler.NewPoolHandler(poolSvc)
@@ -113,12 +124,17 @@ func main() {
 	aclHandler := handler.NewACLHandler(aclSvc)
 	auditHandler := handler.NewAuditHandler(auditSvc)
 
-	r := handler.NewRouter(
+	r, err := handler.NewRouter(
 		authMiddleware, authHandler,
-		fileHandler, tagHandler, categoryHandler, poolHandler,
+		fileHandler, duplicateHandler, tagHandler, categoryHandler, poolHandler,
 		userHandler, aclHandler, auditHandler,
 		cfg.StaticDir,
+		cfg.TrustedProxies,
 	)
+	if err != nil {
+		slog.Error("building router", "err", err)
+		os.Exit(1)
+	}
 
 	// ReadHeaderTimeout bounds slow-header (Slowloris) attacks; body read/write
 	// are left unbounded so large file uploads and downloads can stream.
@@ -129,9 +145,35 @@ func main() {
 		IdleTimeout:       120 * time.Second,
 	}
 
+	// Trigger a graceful shutdown on SIGINT/SIGTERM (the latter is what Docker
+	// sends when the container is stopped or recreated on deploy).
+	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+
+	go func() {
 		slog.Info("starting server", "addr", cfg.ListenAddr)
-	if err := srv.ListenAndServe(); err != nil {
+		// ListenAndServe returns ErrServerClosed after a graceful Shutdown; that
+		// is the expected exit, not a failure.
+		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
 			slog.Error("server error", "err", err)
 			os.Exit(1)
 		}
+	}()
+
+	<-ctx.Done()
+	// Restore default signal handling so a second Ctrl+C / SIGTERM force-quits
+	// instead of waiting on the drain.
+	stop()
+	slog.Info("shutting down", "timeout", cfg.ShutdownTimeout)
+
+	// Stop accepting new connections and let in-flight requests finish, up to the
+	// timeout. Docker's stop grace period reads the same SHUTDOWN_TIMEOUT, so it
+	// won't SIGKILL before this returns.
+	shutdownCtx, cancel := context.WithTimeout(context.Background(), cfg.ShutdownTimeout)
+	defer cancel()
+	if err := srv.Shutdown(shutdownCtx); err != nil {
+		slog.Error("graceful shutdown failed", "err", err)
+		os.Exit(1)
+	}
+	slog.Info("shutdown complete")
 }

backend/internal/config/config.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/joho/godotenv"
@@ -17,6 +18,26 @@ type Config struct {
 	JWTSecret     string
 	JWTAccessTTL  time.Duration
 	JWTRefreshTTL time.Duration
+	// ContentTokenTTL is how long a content token stays valid. The token is a
+	// single-file capability used to open or stream an original by URL (e.g. a
+	// long video in a new tab); it is deliberately longer-lived than the access
+	// token and independent of the session, so playback survives access-token
+	// expiry and refresh rotation. Keep it only as long as a viewing session
+	// plausibly lasts — it is a bearer credential for that one file until expiry.
+	ContentTokenTTL time.Duration
+	// ShutdownTimeout bounds how long a graceful shutdown waits for in-flight
+	// requests to finish after a SIGINT/SIGTERM before the process exits. Keep it
+	// in step with the container's stop grace period — docker-compose.yml reads
+	// the same SHUTDOWN_TIMEOUT for `stop_grace_period`, so Docker doesn't SIGKILL
+	// mid-drain. A long upload/stream can still be cut if it outlasts this window.
+	ShutdownTimeout time.Duration
+	// TrustedProxies lists the reverse-proxy hops (CIDRs or IPs) whose
+	// X-Forwarded-For header is trusted. The auth rate limiter keys on the
+	// client IP, so this must match the proxy in front of the app — otherwise
+	// every request appears to come from the proxy (one shared bucket) or a
+	// direct caller could forge the header. Default covers loopback and the
+	// Docker bridge ranges a host reverse proxy reaches the container through.
+	TrustedProxies []string
 
 	// Initial admin bootstrap (applied on startup if the user does not exist)
 	AdminUsername string
@@ -35,10 +56,25 @@ type Config struct {
 	ThumbHeight   int
 	PreviewWidth  int
 	PreviewHeight int
+	// ThumbMaxPixels caps the pixel count of a source image decoded in-process by
+	// the pure-Go fallback (a decompression-bomb guard and memory bound); larger
+	// images then get a placeholder. It does not apply when vipsthumbnail is
+	// installed, which shrinks on load regardless of source size.
+	ThumbMaxPixels int
+	// ThumbConcurrency bounds how many thumbnails/previews are generated at once,
+	// so a burst of large images can't saturate every core or exhaust RAM. 0 =
+	// auto (half the available CPUs).
+	ThumbConcurrency int
 
 	// Import
 	ImportPath string
 
+	// DuplicateHashThreshold is the maximum Hamming distance (out of 64) between
+	// two perceptual hashes for the files to be treated as duplicate candidates.
+	// Lower = stricter (fewer, more confident matches); higher = looser. Used only
+	// by the dedup rescan that (re)builds data.duplicate_pairs.
+	DuplicateHashThreshold int
+
 	// Static SPA. When set, the server serves the built frontend (and falls
 	// back to index.html for client routes) on the same port as the API. Empty
 	// in local development, where the Vite dev server serves the UI separately.
@@ -68,6 +104,10 @@ func Load() (*Config, error) {
 		return def
 	}
 
+	// parseDuration parses a duration env var. Every duration in this config is a
+	// token TTL, which must be strictly positive — a zero/negative TTL would mint
+	// already-expired tokens (no login, no media playback) — so reject those here
+	// rather than fail mysteriously at runtime.
 	parseDuration := func(key, def string) time.Duration {
 		raw := defaultStr(key, def)
 		d, err := time.ParseDuration(raw)
@@ -75,6 +115,10 @@ func Load() (*Config, error) {
 			errs = append(errs, fmt.Errorf("%s: invalid duration %q: %w", key, raw, err))
 			return 0
 		}
+		if d <= 0 {
+			errs = append(errs, fmt.Errorf("%s must be positive, got %q", key, raw))
+			return 0
+		}
 		return d
 	}
 
@@ -91,6 +135,18 @@ func Load() (*Config, error) {
 		return n
 	}
 
+	parseCSV := func(key, def string) []string {
+		raw := defaultStr(key, def)
+		parts := strings.Split(raw, ",")
+		out := make([]string, 0, len(parts))
+		for _, p := range parts {
+			if p = strings.TrimSpace(p); p != "" {
+				out = append(out, p)
+			}
+		}
+		return out
+	}
+
 	parseInt64 := func(key string, def int64) int64 {
 		raw := os.Getenv(key)
 		if raw == "" {
@@ -110,6 +166,12 @@ func Load() (*Config, error) {
 		JWTAccessTTL:  parseDuration("JWT_ACCESS_TTL", "15m"),
 		JWTRefreshTTL: parseDuration("JWT_REFRESH_TTL", "720h"),
 
+		ContentTokenTTL: parseDuration("CONTENT_TOKEN_TTL", "6h"),
+
+		ShutdownTimeout: parseDuration("SHUTDOWN_TIMEOUT", "15s"),
+
+		TrustedProxies: parseCSV("TRUSTED_PROXIES", "127.0.0.1/32,::1/128,172.16.0.0/12"),
+
 		AdminUsername: defaultStr("ADMIN_USERNAME", "admin"),
 		AdminPassword: requireStr("ADMIN_PASSWORD"),
 
@@ -123,9 +185,13 @@ func Load() (*Config, error) {
 		ThumbHeight:      parseInt("THUMB_HEIGHT", 160),
 		PreviewWidth:     parseInt("PREVIEW_WIDTH", 1920),
 		PreviewHeight:    parseInt("PREVIEW_HEIGHT", 1080),
+		ThumbMaxPixels:   parseInt("THUMB_MAX_PIXELS", 300_000_000), // ~300 Mpx (e.g. 13000×17000)
+		ThumbConcurrency: parseInt("THUMB_CONCURRENCY", 0),          // 0 = auto
 
 		ImportPath: requireStr("IMPORT_PATH"),
 
+		DuplicateHashThreshold: parseInt("DUPLICATE_HASH_THRESHOLD", 10),
+
 		StaticDir: defaultStr("STATIC_DIR", ""),
 	}
 

backend/internal/config/config_test.go

@@ -0,0 +1,57 @@
+package config
+
+import (
+	"strings"
+	"testing"
+)
+
+// setValidEnv sets every required variable to a valid dummy value, so a test can
+// then override one var to exercise a single validation path.
+func setValidEnv(t *testing.T) {
+	t.Helper()
+	t.Setenv("JWT_SECRET", "test-secret")
+	t.Setenv("ADMIN_PASSWORD", "test-password")
+	t.Setenv("DATABASE_URL", "postgres://u:p@localhost:5432/db?sslmode=disable")
+	t.Setenv("FILES_PATH", "/tmp/files")
+	t.Setenv("THUMBS_CACHE_PATH", "/tmp/thumbs")
+	t.Setenv("IMPORT_PATH", "/tmp/import")
+	// Pin the TTLs to valid values so an ambient env var can't perturb the case
+	// under test; individual tests override the one they exercise.
+	t.Setenv("JWT_ACCESS_TTL", "15m")
+	t.Setenv("JWT_REFRESH_TTL", "720h")
+	t.Setenv("CONTENT_TOKEN_TTL", "6h")
+}
+
+func TestLoadValid(t *testing.T) {
+	setValidEnv(t)
+	cfg, err := Load()
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if cfg.JWTAccessTTL <= 0 || cfg.JWTRefreshTTL <= 0 || cfg.ContentTokenTTL <= 0 {
+		t.Fatalf("TTLs should be positive: access=%v refresh=%v content=%v",
+			cfg.JWTAccessTTL, cfg.JWTRefreshTTL, cfg.ContentTokenTTL)
+	}
+}
+
+func TestLoadRejectsNonPositiveTTL(t *testing.T) {
+	cases := []struct{ key, val string }{
+		{"JWT_ACCESS_TTL", "0"},
+		{"JWT_REFRESH_TTL", "-1h"},
+		{"CONTENT_TOKEN_TTL", "0s"},
+	}
+	for _, tc := range cases {
+		t.Run(tc.key, func(t *testing.T) {
+			setValidEnv(t)
+			t.Setenv(tc.key, tc.val)
+
+			_, err := Load()
+			if err == nil {
+				t.Fatalf("expected error for %s=%q", tc.key, tc.val)
+			}
+			if !strings.Contains(err.Error(), tc.key) || !strings.Contains(err.Error(), "must be positive") {
+				t.Fatalf("error should name %s and mention positivity, got: %v", tc.key, err)
+			}
+		})
+	}
+}

backend/internal/db/postgres/duplicate_repo.go

@@ -0,0 +1,145 @@
+package postgres
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"tanabata/backend/internal/domain"
+	"tanabata/backend/internal/port"
+)
+
+// ---------------------------------------------------------------------------
+// DuplicatePairRepo
+// ---------------------------------------------------------------------------
+
+// DuplicatePairRepo implements port.DuplicatePairRepo using PostgreSQL.
+type DuplicatePairRepo struct {
+	pool *pgxpool.Pool
+}
+
+// NewDuplicatePairRepo creates a DuplicatePairRepo backed by pool.
+func NewDuplicatePairRepo(pool *pgxpool.Pool) *DuplicatePairRepo {
+	return &DuplicatePairRepo{pool: pool}
+}
+
+var _ port.DuplicatePairRepo = (*DuplicatePairRepo)(nil)
+
+// ReplaceAll atomically replaces the entire pairs table with the given set.
+// The rescan recomputes pairs from scratch, so a full DELETE + COPY is both
+// correct and the simplest way to drop pairs that no longer qualify.
+func (r *DuplicatePairRepo) ReplaceAll(ctx context.Context, pairs []domain.DuplicatePair) error {
+	tx, err := r.pool.Begin(ctx)
+	if err != nil {
+		return fmt.Errorf("DuplicatePairRepo.ReplaceAll begin: %w", err)
+	}
+	defer tx.Rollback(ctx) //nolint:errcheck // no-op after a successful commit
+
+	if _, err := tx.Exec(ctx, `DELETE FROM data.duplicate_pairs`); err != nil {
+		return fmt.Errorf("DuplicatePairRepo.ReplaceAll delete: %w", err)
+	}
+
+	if len(pairs) > 0 {
+		rows := make([][]any, len(pairs))
+		for i, p := range pairs {
+			rows[i] = []any{p.FileA, p.FileB, int16(p.Distance)}
+		}
+		if _, err := tx.CopyFrom(ctx,
+			pgx.Identifier{"data", "duplicate_pairs"},
+			[]string{"file_a", "file_b", "distance"},
+			pgx.CopyFromRows(rows),
+		); err != nil {
+			return fmt.Errorf("DuplicatePairRepo.ReplaceAll copy: %w", err)
+		}
+	}
+
+	if err := tx.Commit(ctx); err != nil {
+		return fmt.Errorf("DuplicatePairRepo.ReplaceAll commit: %w", err)
+	}
+	return nil
+}
+
+type pairRow struct {
+	FileA    uuid.UUID `db:"file_a"`
+	FileB    uuid.UUID `db:"file_b"`
+	Distance int16     `db:"distance"`
+}
+
+// ListVisible returns every stored pair where both files are live (not trashed),
+// the pair is not dismissed, and — for non-admins — both files are visible to the
+// viewer under the private-by-default model. This is the input to clustering.
+func (r *DuplicatePairRepo) ListVisible(ctx context.Context, viewerID int16, isAdmin bool) ([]domain.DuplicatePair, error) {
+	args := make([]any, 0, 4)
+	n := 1
+	aclWhere := ""
+	if !isAdmin {
+		var ca, cb string
+		ca, n, args = aclVisibilityCond("fa", objTypeFile, viewerID, n, args)
+		cb, n, args = aclVisibilityCond("fb", objTypeFile, viewerID, n, args)
+		aclWhere = "AND " + ca + " AND " + cb
+	}
+
+	sqlStr := fmt.Sprintf(`
+        SELECT p.file_a, p.file_b, p.distance
+        FROM data.duplicate_pairs p
+        JOIN data.files fa ON fa.id = p.file_a AND fa.is_deleted = false
+        JOIN data.files fb ON fb.id = p.file_b AND fb.is_deleted = false
+        WHERE NOT EXISTS (
+            SELECT 1 FROM data.duplicate_dismissals d
+            WHERE d.file_a = p.file_a AND d.file_b = p.file_b
+        )
+        %s
+        ORDER BY p.file_a, p.file_b`, aclWhere)
+
+	rows, err := r.pool.Query(ctx, sqlStr, args...)
+	if err != nil {
+		return nil, fmt.Errorf("DuplicatePairRepo.ListVisible: %w", err)
+	}
+	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[pairRow])
+	if err != nil {
+		return nil, fmt.Errorf("DuplicatePairRepo.ListVisible scan: %w", err)
+	}
+	out := make([]domain.DuplicatePair, len(collected))
+	for i, row := range collected {
+		out[i] = domain.DuplicatePair{FileA: row.FileA, FileB: row.FileB, Distance: int(row.Distance)}
+	}
+	return out, nil
+}
+
+// ---------------------------------------------------------------------------
+// DismissalRepo
+// ---------------------------------------------------------------------------
+
+// DismissalRepo implements port.DismissalRepo using PostgreSQL.
+type DismissalRepo struct {
+	pool *pgxpool.Pool
+}
+
+// NewDismissalRepo creates a DismissalRepo backed by pool.
+func NewDismissalRepo(pool *pgxpool.Pool) *DismissalRepo {
+	return &DismissalRepo{pool: pool}
+}
+
+var _ port.DismissalRepo = (*DismissalRepo)(nil)
+
+// Add records a pair as "not a duplicate". The two ids are stored in canonical
+// (file_a < file_b) order to match the table's CHECK and avoid (a,b)/(b,a)
+// duplicates; a repeated dismissal is a no-op.
+func (r *DismissalRepo) Add(ctx context.Context, a, b uuid.UUID, userID int16) error {
+	if bytes.Compare(a[:], b[:]) > 0 {
+		a, b = b, a
+	}
+	const sqlStr = `
+        INSERT INTO data.duplicate_dismissals (file_a, file_b, dismissed_by)
+        VALUES ($1, $2, $3)
+        ON CONFLICT (file_a, file_b) DO NOTHING`
+	q := connOrTx(ctx, r.pool)
+	if _, err := q.Exec(ctx, sqlStr, a, b, userID); err != nil {
+		return fmt.Errorf("DismissalRepo.Add: %w", err)
+	}
+	return nil
+}

backend/internal/db/postgres/file_repo.go

@@ -36,6 +36,7 @@ type fileRow struct {
 	CreatorName     string          `db:"creator_name"`
 	IsPublic        bool            `db:"is_public"`
 	IsDeleted       bool            `db:"is_deleted"`
+	NeedsReview     bool            `db:"needs_review"`
 }
 
 // fileTagRow is used for both single-file and batch tag loading.
@@ -81,6 +82,7 @@ func toFile(r fileRow) domain.File {
 		CreatorName:     r.CreatorName,
 		IsPublic:        r.IsPublic,
 		IsDeleted:       r.IsDeleted,
+		NeedsReview:     r.NeedsReview,
 		CreatedAt:       domain.UUIDCreatedAt(r.ID),
 	}
 }
@@ -293,7 +295,7 @@ const fileSelectCTE = `
            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
+           r.is_public, r.is_deleted, r.needs_review
     FROM r
     JOIN core.mime_types mt ON mt.id = r.mime_id
     JOIN core.users u       ON u.id  = r.creator_id`
@@ -316,7 +318,8 @@ func (r *FileRepo) Create(ctx context.Context, f *domain.File) (*domain.File, er
                 $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
+                      metadata, exif, phash, creator_id, is_public, is_deleted,
+                      needs_review
         )` + fileSelectCTE
 
 	q := connOrTx(ctx, r.pool)
@@ -346,7 +349,7 @@ func (r *FileRepo) GetByID(ctx context.Context, id uuid.UUID) (*domain.File, err
                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
+               f.is_public, f.is_deleted, f.needs_review
         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
@@ -389,7 +392,8 @@ func (r *FileRepo) Update(ctx context.Context, id uuid.UUID, f *domain.File) (*d
                 is_public        = $6
             WHERE id = $1
             RETURNING id, original_name, mime_id, content_datetime, notes,
-                      metadata, exif, phash, creator_id, is_public, is_deleted
+                      metadata, exif, phash, creator_id, is_public, is_deleted,
+                      needs_review
         )` + fileSelectCTE
 
 	q := connOrTx(ctx, r.pool)
@@ -416,6 +420,115 @@ func (r *FileRepo) Update(ctx context.Context, id uuid.UUID, f *domain.File) (*d
 	return &updated, nil
 }
 
+// SetNeedsReview sets the review status on the given files in one statement.
+// Trashed files are left untouched. No-op for an empty id list.
+func (r *FileRepo) SetNeedsReview(ctx context.Context, ids []uuid.UUID, value bool) error {
+	if len(ids) == 0 {
+		return nil
+	}
+	const sqlStr = `UPDATE data.files SET needs_review = $2 WHERE id = ANY($1) AND is_deleted = false`
+	q := connOrTx(ctx, r.pool)
+	if _, err := q.Exec(ctx, sqlStr, ids, value); err != nil {
+		return fmt.Errorf("FileRepo.SetNeedsReview: %w", err)
+	}
+	return nil
+}
+
+// SetPHash sets (or clears, when phash is nil) the perceptual hash of a file.
+// Used by the dedup backfill and on content replacement; phash is non-critical,
+// recomputable metadata, so callers may treat failures as best-effort.
+func (r *FileRepo) SetPHash(ctx context.Context, id uuid.UUID, phash *int64) error {
+	const sqlStr = `UPDATE data.files SET phash = $2 WHERE id = $1`
+	q := connOrTx(ctx, r.pool)
+	if _, err := q.Exec(ctx, sqlStr, id, phash); err != nil {
+		return fmt.Errorf("FileRepo.SetPHash: %w", err)
+	}
+	return nil
+}
+
+// ---------------------------------------------------------------------------
+// Perceptual-hash / duplicate support
+// ---------------------------------------------------------------------------
+
+// ListMissingPHash returns live image/video files that have no perceptual hash
+// yet — the work list for the dedup backfill. Tags are not loaded (the backfill
+// only needs the id and MIME type to choose image vs video hashing).
+func (r *FileRepo) ListMissingPHash(ctx context.Context) ([]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, f.needs_review
+        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.phash IS NULL AND f.is_deleted = false
+          AND (mt.name LIKE 'image/%' OR mt.name LIKE 'video/%')
+        ORDER BY f.id`
+
+	q := connOrTx(ctx, r.pool)
+	rows, err := q.Query(ctx, sqlStr)
+	if err != nil {
+		return nil, fmt.Errorf("FileRepo.ListMissingPHash: %w", err)
+	}
+	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[fileRow])
+	if err != nil {
+		return nil, fmt.Errorf("FileRepo.ListMissingPHash scan: %w", err)
+	}
+	files := make([]domain.File, len(collected))
+	for i, row := range collected {
+		files[i] = toFile(row)
+	}
+	return files, nil
+}
+
+// phashRow is the minimal projection used to build duplicate clusters.
+type phashRow struct {
+	ID    uuid.UUID `db:"id"`
+	PHash int64     `db:"phash"`
+}
+
+// ListAllPHashes returns the id and perceptual hash of every live, hashed file.
+// It is the global input to the dedup rescan, so it deliberately ignores ACL —
+// the rescan builds the shared pairs table; visibility is enforced on read.
+func (r *FileRepo) ListAllPHashes(ctx context.Context) ([]domain.PHashEntry, error) {
+	const sqlStr = `SELECT id, phash FROM data.files WHERE is_deleted = false AND phash IS NOT NULL`
+	q := connOrTx(ctx, r.pool)
+	rows, err := q.Query(ctx, sqlStr)
+	if err != nil {
+		return nil, fmt.Errorf("FileRepo.ListAllPHashes: %w", err)
+	}
+	collected, err := pgx.CollectRows(rows, pgx.RowToStructByName[phashRow])
+	if err != nil {
+		return nil, fmt.Errorf("FileRepo.ListAllPHashes scan: %w", err)
+	}
+	out := make([]domain.PHashEntry, len(collected))
+	for i, row := range collected {
+		out[i] = domain.PHashEntry{ID: row.ID, PHash: row.PHash}
+	}
+	return out, nil
+}
+
+// CopyPoolMemberships adds targetID to every pool sourceID belongs to (copying
+// the source's position), skipping pools the target is already in. Used by the
+// duplicate merge to preserve the discarded file's pool memberships on the
+// survivor. The merge is authorised at the file level, so pool ACL is not
+// re-checked here.
+func (r *FileRepo) CopyPoolMemberships(ctx context.Context, targetID, sourceID uuid.UUID) error {
+	const sqlStr = `
+        INSERT INTO data.file_pool (file_id, pool_id, position)
+        SELECT $1, fp.pool_id, fp.position
+        FROM data.file_pool fp
+        WHERE fp.file_id = $2
+        ON CONFLICT (file_id, pool_id) DO NOTHING`
+	q := connOrTx(ctx, r.pool)
+	if _, err := q.Exec(ctx, sqlStr, targetID, sourceID); err != nil {
+		return fmt.Errorf("FileRepo.CopyPoolMemberships: %w", err)
+	}
+	return nil
+}
+
 // ---------------------------------------------------------------------------
 // SoftDelete / Restore / DeletePermanent
 // ---------------------------------------------------------------------------
@@ -444,7 +557,8 @@ func (r *FileRepo) Restore(ctx context.Context, id uuid.UUID) (*domain.File, err
             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
+                      metadata, exif, phash, creator_id, is_public, is_deleted,
+                      needs_review
         )` + fileSelectCTE
 
 	q := connOrTx(ctx, r.pool)
@@ -638,7 +752,7 @@ func (r *FileRepo) List(ctx context.Context, params domain.FileListParams) (*dom
                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
+               f.is_public, f.is_deleted, f.needs_review
         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

backend/internal/db/postgres/filter_parser.go

@@ -23,6 +23,7 @@ const (
 	ftkTag       // t=<uuid>
 	ftkMimeExact // m=<int>
 	ftkMimeLike  // m~<pattern>
+	ftkReview    // r=<0|1>
 )
 
 type filterToken struct {
@@ -31,6 +32,7 @@ type filterToken struct {
 	untagged bool      // ftkTag with zero UUID → "file has no tags"
 	mimeID   int16     // ftkMimeExact
 	pattern  string    // ftkMimeLike
+	review   bool      // ftkReview → needs_review value
 }
 
 // ---------------------------------------------------------------------------
@@ -80,6 +82,8 @@ func (l *leafNode) toSQL(n int, args []any) (string, int, []any) {
 	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)
+	case ftkReview:
+		return fmt.Sprintf("f.needs_review = $%d", n), n + 1, append(args, l.tok.review)
 	}
 	panic("filterNode.toSQL: unknown leaf kind")
 }
@@ -130,6 +134,15 @@ func lexFilter(dsl string) ([]filterToken, error) {
 		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:]})
+		case strings.HasPrefix(p, "r="):
+			switch p[2:] {
+			case "1":
+				tokens = append(tokens, filterToken{kind: ftkReview, review: true})
+			case "0":
+				tokens = append(tokens, filterToken{kind: ftkReview, review: false})
+			default:
+				return nil, fmt.Errorf("filter: invalid review flag %q (want r=0 or r=1)", p[2:])
+			}
 		default:
 			return nil, fmt.Errorf("filter: unknown token %q", p)
 		}
@@ -241,7 +254,7 @@ func (p *filterParser) parseAtom() (filterNode, error) {
 		return expr, nil
 	}
 	switch t.kind {
-	case ftkTag, ftkMimeExact, ftkMimeLike:
+	case ftkTag, ftkMimeExact, ftkMimeLike, ftkReview:
 		p.next()
 		return &leafNode{t}, nil
 	default:

backend/internal/db/postgres/filter_parser_test.go

@@ -6,6 +6,50 @@ import (
 	"github.com/google/uuid"
 )
 
+func TestParseFilterReview(t *testing.T) {
+	t.Run("r=1 needs review", func(t *testing.T) {
+		sql, n, args, err := ParseFilter("{r=1}", 1)
+		if err != nil {
+			t.Fatalf("ParseFilter: %v", err)
+		}
+		if sql != "f.needs_review = $1" {
+			t.Fatalf("sql = %q", sql)
+		}
+		if n != 2 || len(args) != 1 || args[0] != true {
+			t.Fatalf("n=%d args=%v", n, args)
+		}
+	})
+
+	t.Run("r=0 reviewed", func(t *testing.T) {
+		sql, _, args, err := ParseFilter("{r=0}", 1)
+		if err != nil {
+			t.Fatalf("ParseFilter: %v", err)
+		}
+		if sql != "f.needs_review = $1" || len(args) != 1 || args[0] != false {
+			t.Fatalf("sql=%q args=%v", sql, args)
+		}
+	})
+
+	t.Run("combined with mime", func(t *testing.T) {
+		sql, n, args, err := ParseFilter("{r=1,&,m~image/%}", 1)
+		if err != nil {
+			t.Fatalf("ParseFilter: %v", err)
+		}
+		if sql != "(f.needs_review = $1 AND mt.name LIKE $2)" {
+			t.Fatalf("sql = %q", sql)
+		}
+		if n != 3 || len(args) != 2 || args[0] != true || args[1] != "image/%" {
+			t.Fatalf("n=%d args=%v", n, args)
+		}
+	})
+
+	t.Run("invalid flag rejected", func(t *testing.T) {
+		if _, _, _, err := ParseFilter("{r=2}", 1); err == nil {
+			t.Fatal("expected error for r=2")
+		}
+	})
+}
+
 func TestFilterTagUses(t *testing.T) {
 	a := uuid.MustParse("11111111-1111-1111-1111-111111111111")
 	b := uuid.MustParse("22222222-2222-2222-2222-222222222222")

backend/internal/db/postgres/pool_repo.go

@@ -30,6 +30,8 @@ type poolRow struct {
 	CreatorID   int16     `db:"creator_id"`
 	CreatorName string    `db:"creator_name"`
 	IsPublic    bool      `db:"is_public"`
+	SortKey     string    `db:"sort_key"`
+	SortOrder   string    `db:"sort_order"`
 	FileCount   int       `db:"file_count"`
 }
 
@@ -68,6 +70,8 @@ func toPool(r poolRow) domain.Pool {
 		CreatorID:   r.CreatorID,
 		CreatorName: r.CreatorName,
 		IsPublic:    r.IsPublic,
+		SortKey:     r.SortKey,
+		SortOrder:   r.SortOrder,
 		FileCount:   r.FileCount,
 		CreatedAt:   domain.UUIDCreatedAt(r.ID),
 	}
@@ -103,8 +107,14 @@ func toPoolFile(r poolFileRow) domain.PoolFile {
 // Cursor
 // ---------------------------------------------------------------------------
 
+// poolFileCursor is the keyset paging cursor for pool files. Which fields are
+// populated depends on the pool's sort key: Pos for manual (position), Val for
+// content_datetime (RFC3339Nano) / original_name (the coalesced name); the
+// "created" sort orders by file id alone, so only FileID matters. FileID is
+// always the final tiebreak.
 type poolFileCursor struct {
-	Position int    `json:"p"`
+	Pos    int    `json:"p,omitempty"`
+	Val    string `json:"v,omitempty"`
 	FileID string `json:"id"`
 }
 
@@ -135,6 +145,7 @@ const poolCountSubquery = `(SELECT pool_id, COUNT(*) AS cnt FROM data.file_pool
 const poolSelectFrom = `
 SELECT p.id, p.name, p.notes, p.metadata,
        p.creator_id, u.name AS creator_name, p.is_public,
+       p.sort_key, p.sort_order,
        COALESCE(fc.cnt, 0) AS file_count
 FROM data.pools p
 JOIN core.users u ON u.id = p.creator_id
@@ -147,6 +158,29 @@ func poolSortColumn(s string) string {
 	return "p.id" // "created"
 }
 
+// poolFileSort maps a pool's stored sort settings to the SQL column expression,
+// the ORDER BY direction, and the keyset comparison operator used for paging.
+// The column is chosen so it is never NULL (original_name is coalesced), which
+// keeps the keyset comparison total.
+func poolFileSort(sortKey, sortOrder string) (col, dir, cmp string) {
+	dir, cmp = "ASC", ">"
+	if strings.EqualFold(sortOrder, domain.SortOrderDesc) {
+		dir, cmp = "DESC", "<"
+	}
+	switch sortKey {
+	case domain.PoolSortContentDatetime:
+		col = "f.content_datetime"
+	case domain.PoolSortOriginalName:
+		col = "COALESCE(f.original_name, '')"
+	case domain.PoolSortCreated:
+		col = "f.id"
+	default: // manual — the user-arranged sequence; direction does not apply
+		col = "fp.position"
+		dir, cmp = "ASC", ">"
+	}
+	return col, dir, cmp
+}
+
 // ---------------------------------------------------------------------------
 // PoolRepo
 // ---------------------------------------------------------------------------
@@ -207,6 +241,7 @@ func (r *PoolRepo) List(ctx context.Context, params port.OffsetParams) (*domain.
 	query := fmt.Sprintf(`
 SELECT p.id, p.name, p.notes, p.metadata,
        p.creator_id, u.name AS creator_name, p.is_public,
+       p.sort_key, p.sort_order,
        COALESCE(fc.cnt, 0) AS file_count,
        COUNT(*) OVER() AS total
 FROM data.pools p
@@ -266,6 +301,16 @@ WHERE p.id = $1`
 	return &p, nil
 }
 
+// RecordView appends a row to activity.pool_views. viewed_at defaults to
+// statement_timestamp(), so each call records a distinct view in the history.
+func (r *PoolRepo) RecordView(ctx context.Context, poolID uuid.UUID, userID int16) error {
+	const query = `INSERT INTO activity.pool_views (pool_id, user_id) VALUES ($1, $2)`
+	if _, err := connOrTx(ctx, r.pool).Exec(ctx, query, poolID, userID); err != nil {
+		return fmt.Errorf("PoolRepo.RecordView: %w", err)
+	}
+	return nil
+}
+
 // ---------------------------------------------------------------------------
 // Create
 // ---------------------------------------------------------------------------
@@ -279,6 +324,7 @@ WITH ins AS (
 )
 SELECT ins.id, ins.name, ins.notes, ins.metadata,
        ins.creator_id, u.name AS creator_name, ins.is_public,
+       ins.sort_key, ins.sort_order,
        0 AS file_count
 FROM ins
 JOIN core.users u ON u.id = ins.creator_id`
@@ -315,12 +361,15 @@ WITH upd AS (
         name       = $2,
         notes      = $3,
         metadata   = COALESCE($4, metadata),
-        is_public = $5
+        is_public  = $5,
+        sort_key   = $6,
+        sort_order = $7
     WHERE id = $1
     RETURNING *
 )
 SELECT upd.id, upd.name, upd.notes, upd.metadata,
        upd.creator_id, u.name AS creator_name, upd.is_public,
+       upd.sort_key, upd.sort_order,
        COALESCE(fc.cnt, 0) AS file_count
 FROM upd
 JOIN core.users u ON u.id = upd.creator_id
@@ -333,7 +382,7 @@ LEFT JOIN (SELECT pool_id, COUNT(*) AS cnt FROM data.file_pool WHERE pool_id = $
 	}
 
 	q := connOrTx(ctx, r.pool)
-	rows, err := q.Query(ctx, query, id, p.Name, p.Notes, meta, p.IsPublic)
+	rows, err := q.Query(ctx, query, id, p.Name, p.Notes, meta, p.IsPublic, p.SortKey, p.SortOrder)
 	if err != nil {
 		return nil, fmt.Errorf("PoolRepo.Update: %w", err)
 	}
@@ -402,8 +451,16 @@ func (r *PoolRepo) ListFiles(ctx context.Context, poolID uuid.UUID, params port.
 		}
 	}
 
-	// Cursor condition.
+	// Resolve the pool's sort setting (defaulting to manual position order) into
-	var orderBy string
+	// the ORDER BY column, direction, and keyset comparison operator.
+	sortKey := params.SortKey
+	if !domain.ValidPoolSortKey(sortKey) {
+		sortKey = domain.PoolSortManual
+	}
+	col, dir, cmp := poolFileSort(sortKey, params.SortOrder)
+
+	// Keyset cursor condition. For "created" the file id is both the sort key and
+	// the tiebreak, so a single comparison suffices; the others compare (col, id).
 	if params.Cursor != "" {
 		cur, err := decodePoolCursor(params.Cursor)
 		if err != nil {
@@ -413,13 +470,36 @@ func (r *PoolRepo) ListFiles(ctx context.Context, poolID uuid.UUID, params port.
 		if err != nil {
 			return nil, domain.ErrValidation
 		}
+		if sortKey == domain.PoolSortCreated {
+			conds = append(conds, fmt.Sprintf("f.id %s $%d", cmp, n))
+			args = append(args, fileID)
+			n++
+		} else {
 			conds = append(conds, fmt.Sprintf(
-			"(fp.position > $%d OR (fp.position = $%d AND fp.file_id > $%d))",
+				"(%s %s $%d OR (%s = $%d AND f.id %s $%d))", col, cmp, n, col, n, cmp, n+1))
-			n, n, n+1))
+			switch sortKey {
-		args = append(args, cur.Position, fileID)
+			case domain.PoolSortContentDatetime:
+				t, err := time.Parse(time.RFC3339Nano, cur.Val)
+				if err != nil {
+					return nil, domain.ErrValidation
+				}
+				args = append(args, t)
+			case domain.PoolSortOriginalName:
+				args = append(args, cur.Val)
+			default: // manual
+				args = append(args, cur.Pos)
+			}
+			args = append(args, fileID)
 			n += 2
 		}
-	orderBy = "fp.position ASC, fp.file_id ASC"
+	}
+
+	var orderBy string
+	if sortKey == domain.PoolSortCreated {
+		orderBy = fmt.Sprintf("f.id %s", dir)
+	} else {
+		orderBy = fmt.Sprintf("%s %s, f.id %s", col, dir, dir)
+	}
 
 	where := "WHERE " + strings.Join(conds, " AND ")
 	args = append(args, limit+1)
@@ -458,11 +538,21 @@ LIMIT $%d`, fileSelectForPool, where, orderBy, n)
 
 	if hasMore && len(collected) > 0 {
 		last := collected[len(collected)-1]
-		cur := encodePoolCursor(poolFileCursor{
+		cursor := poolFileCursor{FileID: last.ID.String()}
-			Position: last.Position,
+		switch sortKey {
-			FileID:   last.ID.String(),
+		case domain.PoolSortContentDatetime:
-		})
+			cursor.Val = last.ContentDatetime.UTC().Format(time.RFC3339Nano)
-		page.NextCursor = &cur
+		case domain.PoolSortOriginalName:
+			if last.OriginalName != nil {
+				cursor.Val = *last.OriginalName
+			}
+		case domain.PoolSortCreated:
+			// file id alone orders; nothing else to carry
+		default: // manual
+			cursor.Pos = last.Position
+		}
+		enc := encodePoolCursor(cursor)
+		page.NextCursor = &enc
 	}
 
 	// Batch-load tags.

backend/internal/db/postgres/postgres.go

@@ -11,12 +11,30 @@ import (
 	"tanabata/backend/internal/db"
 )
 
+// appName tags every connection as application_name, so the backend's sessions
+// are identifiable in pg_stat_activity and server logs (and distinguishable from
+// e.g. goose migrations or a psql shell).
+const appName = "tanabata-backend"
+
 // 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)
+	cfg, err := pgxpool.ParseConfig(url)
 	if err != nil {
-		return nil, fmt.Errorf("pgxpool.New: %w", err)
+		return nil, fmt.Errorf("pgxpool.ParseConfig: %w", err)
+	}
+	// Set application_name unless the operator already specified one in the DSN
+	// (or via PGAPPNAME), so an explicit override still wins.
+	if cfg.ConnConfig.RuntimeParams == nil {
+		cfg.ConnConfig.RuntimeParams = map[string]string{}
+	}
+	if cfg.ConnConfig.RuntimeParams["application_name"] == "" {
+		cfg.ConnConfig.RuntimeParams["application_name"] = appName
+	}
+
+	pool, err := pgxpool.NewWithConfig(ctx, cfg)
+	if err != nil {
+		return nil, fmt.Errorf("pgxpool.NewWithConfig: %w", err)
 	}
 	if err := pool.Ping(ctx); err != nil {
 		pool.Close()

backend/internal/db/postgres/tag_repo.go

@@ -272,7 +272,7 @@ 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)
+    VALUES ($1, $2, NULLIF($3, ''), $4, $5, $6, $7)
     RETURNING *
 )
 SELECT
@@ -321,7 +321,7 @@ WITH upd AS (
     UPDATE data.tags SET
         name        = $2,
         notes       = $3,
-        color       = $4,
+        color       = NULLIF($4, ''),
         category_id = $5,
         metadata    = COALESCE($6, metadata),
         is_public   = $7
@@ -604,10 +604,14 @@ WHERE when_tag_id = $1 AND then_tag_id = $2`
 	if !active || !applyToExisting {
 		return nil
 	}
+	return r.ApplyToExisting(ctx, whenTagID, thenTagID)
+}
 
-	// Retroactively apply the full transitive expansion of thenTagID to all
+// ApplyToExisting retroactively applies the full transitive expansion of
-	// files that already carry whenTagID. The recursive CTE walks active rules
+// thenTagID to all files that already carry whenTagID. The recursive CTE walks
-	// starting from thenTagID (mirrors the Go expandTagSet BFS).
+// active rules starting from thenTagID (mirrors the Go expandTagSet BFS), so
+// inactive downstream rules are not followed. Idempotent via ON CONFLICT.
+func (r *TagRuleRepo) ApplyToExisting(ctx context.Context, whenTagID, thenTagID uuid.UUID) error {
 	const retroQuery = `
 WITH RECURSIVE expansion(tag_id) AS (
     SELECT $2::uuid
@@ -624,8 +628,9 @@ CROSS JOIN expansion e
 WHERE ft.tag_id = $1
 ON CONFLICT DO NOTHING`
 
+	q := connOrTx(ctx, r.pool)
 	if _, err := q.Exec(ctx, retroQuery, whenTagID, thenTagID); err != nil {
-		return fmt.Errorf("TagRuleRepo.SetActive retroactive apply: %w", err)
+		return fmt.Errorf("TagRuleRepo.ApplyToExisting: %w", err)
 	}
 	return nil
 }

backend/internal/domain/duplicate.go

@@ -0,0 +1,18 @@
+package domain
+
+import "github.com/google/uuid"
+
+// PHashEntry is a file's perceptual hash, the input to duplicate clustering.
+type PHashEntry struct {
+	ID    uuid.UUID
+	PHash int64
+}
+
+// DuplicatePair is an unordered pair of files whose perceptual hashes are within
+// the configured Hamming threshold. FileA < FileB by UUID byte order (canonical),
+// so a pair is represented exactly once.
+type DuplicatePair struct {
+	FileA    uuid.UUID
+	FileB    uuid.UUID
+	Distance int
+}

backend/internal/domain/file.go

@@ -29,6 +29,7 @@ type File struct {
 	CreatorName     string // denormalized from core.users
 	IsPublic        bool
 	IsDeleted       bool
+	NeedsReview     bool      // tagging not yet marked done; cleared by an explicit review action
 	CreatedAt       time.Time // extracted from UUID v7 via UUIDCreatedAt
 	Tags            []Tag     // loaded with the file
 }

backend/internal/domain/pool.go

@@ -7,6 +7,32 @@ import (
 	"github.com/google/uuid"
 )
 
+// Pool file sort keys. PoolSortManual keeps the user-defined order in
+// file_pool.position; the others sort the pool's files by that file field.
+const (
+	PoolSortManual          = "manual"
+	PoolSortContentDatetime = "content_datetime"
+	PoolSortCreated         = "created"
+	PoolSortOriginalName    = "original_name"
+
+	SortOrderAsc  = "asc"
+	SortOrderDesc = "desc"
+)
+
+// ValidPoolSortKey reports whether s is an accepted pool sort key.
+func ValidPoolSortKey(s string) bool {
+	switch s {
+	case PoolSortManual, PoolSortContentDatetime, PoolSortCreated, PoolSortOriginalName:
+		return true
+	}
+	return false
+}
+
+// ValidSortOrder reports whether s is an accepted sort direction.
+func ValidSortOrder(s string) bool {
+	return s == SortOrderAsc || s == SortOrderDesc
+}
+
 // Pool is an ordered collection of files.
 type Pool struct {
 	ID          uuid.UUID
@@ -16,6 +42,11 @@ type Pool struct {
 	CreatorID   int16
 	CreatorName string // denormalized
 	IsPublic    bool
+	// SortKey / SortOrder control how the pool's files are ordered. When SortKey
+	// is PoolSortManual, files follow the manual position order and can be
+	// reordered; otherwise they are sorted automatically and reordering is a no-op.
+	SortKey   string
+	SortOrder string
 	FileCount int
 	CreatedAt time.Time // extracted from UUID v7 via UUIDCreatedAt
 }

backend/internal/handler/duplicate_handler.go

@@ -0,0 +1,126 @@
+package handler
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+
+	"tanabata/backend/internal/domain"
+	"tanabata/backend/internal/service"
+)
+
+// DuplicateHandler handles the /files/duplicates endpoints.
+type DuplicateHandler struct {
+	dupSvc *service.DuplicateService
+}
+
+// NewDuplicateHandler creates a DuplicateHandler.
+func NewDuplicateHandler(dupSvc *service.DuplicateService) *DuplicateHandler {
+	return &DuplicateHandler{dupSvc: dupSvc}
+}
+
+// List handles GET /files/duplicates — an offset-paginated list of duplicate
+// clusters, each a group of files within the perceptual-hash threshold.
+func (h *DuplicateHandler) List(c *gin.Context) {
+	limit, offset := 20, 0
+	if n, err := strconv.Atoi(c.Query("limit")); err == nil {
+		limit = n
+	}
+	if n, err := strconv.Atoi(c.Query("offset")); err == nil {
+		offset = n
+	}
+	if limit < 1 {
+		limit = 1
+	}
+	if limit > 50 {
+		limit = 50
+	}
+	if offset < 0 {
+		offset = 0
+	}
+
+	clusters, total, err := h.dupSvc.Clusters(c.Request.Context(), limit, offset)
+	if err != nil {
+		respondError(c, err)
+		return
+	}
+
+	items := make([]gin.H, len(clusters))
+	for i, cl := range clusters {
+		fs := make([]fileJSON, len(cl.Files))
+		for j, f := range cl.Files {
+			fs[j] = toFileJSON(f)
+		}
+		dists := make([]gin.H, len(cl.Distances))
+		for j, d := range cl.Distances {
+			dists[j] = gin.H{"a": d.A, "b": d.B, "distance": d.Distance}
+		}
+		items[i] = gin.H{"files": fs, "distances": dists}
+	}
+	respondJSON(c, http.StatusOK, gin.H{
+		"items":  items,
+		"total":  total,
+		"limit":  limit,
+		"offset": offset,
+	})
+}
+
+// Dismiss handles POST /files/duplicates/dismiss — mark a pair "not a duplicate".
+func (h *DuplicateHandler) Dismiss(c *gin.Context) {
+	var body struct {
+		FileIDA string `json:"file_id_a" binding:"required"`
+		FileIDB string `json:"file_id_b" binding:"required"`
+	}
+	if err := c.ShouldBindJSON(&body); err != nil {
+		respondError(c, domain.ErrValidation)
+		return
+	}
+	ids, err := parseUUIDs([]string{body.FileIDA, body.FileIDB})
+	if err != nil {
+		respondError(c, domain.ErrValidation)
+		return
+	}
+	if err := h.dupSvc.Dismiss(c.Request.Context(), ids[0], ids[1]); err != nil {
+		respondError(c, err)
+		return
+	}
+	c.Status(http.StatusNoContent)
+}
+
+// Resolve handles POST /files/duplicates/resolve — merge a duplicate pair,
+// keeping one file and folding the chosen fields in from the other. Returns the
+// updated survivor. delete_discarded defaults to true.
+func (h *DuplicateHandler) Resolve(c *gin.Context) {
+	var body struct {
+		Keep            string              `json:"keep"    binding:"required"`
+		Discard         string              `json:"discard" binding:"required"`
+		Fields          service.MergeFields `json:"fields"`
+		DeleteDiscarded *bool               `json:"delete_discarded"`
+	}
+	if err := c.ShouldBindJSON(&body); err != nil {
+		respondError(c, domain.ErrValidation)
+		return
+	}
+	ids, err := parseUUIDs([]string{body.Keep, body.Discard})
+	if err != nil {
+		respondError(c, domain.ErrValidation)
+		return
+	}
+
+	del := true
+	if body.DeleteDiscarded != nil {
+		del = *body.DeleteDiscarded
+	}
+	f, err := h.dupSvc.Resolve(c.Request.Context(), service.MergeSpec{
+		Keep:            ids[0],
+		Discard:         ids[1],
+		Fields:          body.Fields,
+		DeleteDiscarded: del,
+	})
+	if err != nil {
+		respondError(c, err)
+		return
+	}
+	respondJSON(c, http.StatusOK, toFileJSON(*f))
+}

backend/internal/handler/file_handler.go

@@ -22,13 +22,14 @@ import (
 type FileHandler struct {
 	fileSvc        *service.FileService
 	tagSvc         *service.TagService
+	authSvc        *service.AuthService
 	maxUploadBytes int64
 }
 
 // NewFileHandler creates a FileHandler. maxUploadBytes caps the size of an
-// uploaded or replacement file.
+// uploaded or replacement file. authSvc mints content tokens for media URLs.
-func NewFileHandler(fileSvc *service.FileService, tagSvc *service.TagService, maxUploadBytes int64) *FileHandler {
+func NewFileHandler(fileSvc *service.FileService, tagSvc *service.TagService, authSvc *service.AuthService, maxUploadBytes int64) *FileHandler {
-	return &FileHandler{fileSvc: fileSvc, tagSvc: tagSvc, maxUploadBytes: maxUploadBytes}
+	return &FileHandler{fileSvc: fileSvc, tagSvc: tagSvc, authSvc: authSvc, maxUploadBytes: maxUploadBytes}
 }
 
 // formFileLimited reads the "file" multipart field while bounding how many bytes
@@ -83,6 +84,7 @@ type fileJSON struct {
 	CreatorName     string          `json:"creator_name"`
 	IsPublic        bool            `json:"is_public"`
 	IsDeleted       bool            `json:"is_deleted"`
+	NeedsReview     bool            `json:"needs_review"`
 	CreatedAt       string          `json:"created_at"`
 	Tags            []tagJSON       `json:"tags"`
 }
@@ -130,6 +132,7 @@ func toFileJSON(f domain.File) fileJSON {
 		CreatorName:     f.CreatorName,
 		IsPublic:        f.IsPublic,
 		IsDeleted:       f.IsDeleted,
+		NeedsReview:     f.NeedsReview,
 		CreatedAt:       f.CreatedAt.Format(time.RFC3339),
 		Tags:            tags,
 	}
@@ -383,6 +386,38 @@ func (h *FileHandler) SoftDelete(c *gin.Context) {
 	c.Status(http.StatusNoContent)
 }
 
+// ---------------------------------------------------------------------------
+// POST /files/:id/content-token
+// ---------------------------------------------------------------------------
+
+// CreateContentToken mints a short-lived, single-file capability token the
+// client can put in a content URL's access_token query parameter to open or
+// stream the original by link (e.g. a long video in a new tab) without the URL
+// dying when the 15-minute access token expires. It first enforces view
+// permission via fileSvc.Get, so a token is only issued for a file the caller
+// may actually read.
+func (h *FileHandler) CreateContentToken(c *gin.Context) {
+	id, ok := parseFileID(c)
+	if !ok {
+		return
+	}
+
+	// Authorize (and confirm existence) the same way content serving does.
+	if _, err := h.fileSvc.Get(c.Request.Context(), id); err != nil {
+		respondError(c, err)
+		return
+	}
+
+	userID, isAdmin, _ := domain.UserFromContext(c.Request.Context())
+	token, expiresIn, err := h.authSvc.GenerateContentToken(id.String(), userID, isAdmin)
+	if err != nil {
+		respondError(c, err)
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"token": token, "expires_in": expiresIn})
+}
+
 // ---------------------------------------------------------------------------
 // GET /files/:id/content
 // ---------------------------------------------------------------------------
@@ -628,6 +663,33 @@ func (h *FileHandler) BulkDelete(c *gin.Context) {
 	c.Status(http.StatusNoContent)
 }
 
+// BulkReview sets the review status on one or more files. A single-file toggle
+// is just a one-element file_ids array. Files the caller cannot edit are
+// silently skipped (handled in the service).
+func (h *FileHandler) BulkReview(c *gin.Context) {
+	var body struct {
+		FileIDs     []string `json:"file_ids"     binding:"required"`
+		NeedsReview *bool    `json:"needs_review" binding:"required"`
+	}
+	if err := c.ShouldBindJSON(&body); err != nil || body.NeedsReview == nil {
+		respondError(c, domain.ErrValidation)
+		return
+	}
+
+	fileIDs, err := parseUUIDs(body.FileIDs)
+	if err != nil {
+		respondError(c, domain.ErrValidation)
+		return
+	}
+
+	if err := h.fileSvc.SetNeedsReview(c.Request.Context(), fileIDs, *body.NeedsReview); err != nil {
+		respondError(c, err)
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}
+
 // ---------------------------------------------------------------------------
 // POST /files/bulk/common-tags
 // ---------------------------------------------------------------------------

backend/internal/handler/middleware.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
 
 	"tanabata/backend/internal/domain"
 	"tanabata/backend/internal/service"
@@ -50,6 +51,55 @@ func (m *AuthMiddleware) Handle() gin.HandlerFunc {
 	}
 }
 
+// HandleContent authenticates a file-content GET, accepting either a normal
+// access token or a content token scoped (by its fid claim) to the :id in the
+// path. The content token is what keeps a long media stream playing after the
+// short access token would have expired. View permission is still enforced in
+// the handler against the resolved user, so a content token only widens *when*
+// a file may be read by URL, never *which* files.
+func (m *AuthMiddleware) HandleContent() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		token := bearerToken(c)
+		if token == "" {
+			contentUnauthorized(c)
+			return
+		}
+
+		// A regular access token grants access to everything as usual.
+		if claims, err := m.authSvc.ValidateAccessToken(c.Request.Context(), token); err == nil {
+			ctx := domain.WithUser(c.Request.Context(), claims.UserID, claims.IsAdmin, claims.SessionID)
+			c.Request = c.Request.WithContext(ctx)
+			c.Next()
+			return
+		}
+
+		// Otherwise accept a content token minted for exactly this file. Normalise
+		// the path id to canonical form so it matches the minted fid claim.
+		id, err := uuid.Parse(c.Param("id"))
+		if err != nil {
+			contentUnauthorized(c)
+			return
+		}
+		claims, err := m.authSvc.ValidateContentToken(token, id.String())
+		if err != nil {
+			contentUnauthorized(c)
+			return
+		}
+		// A content token carries no session (sid 0); it is session-independent.
+		ctx := domain.WithUser(c.Request.Context(), claims.UserID, claims.IsAdmin, claims.SessionID)
+		c.Request = c.Request.WithContext(ctx)
+		c.Next()
+	}
+}
+
+func contentUnauthorized(c *gin.Context) {
+	c.JSON(http.StatusUnauthorized, errorBody{
+		Code:    domain.ErrUnauthorized.Code(),
+		Message: "invalid or expired token",
+	})
+	c.Abort()
+}
+
 // bearerToken extracts the access token from the Authorization header. As a
 // fallback it accepts an ?access_token= query parameter, but only for GET
 // requests — this lets the browser open media (e.g. /files/{id}/content) via a

backend/internal/handler/pool_handler.go

@@ -34,6 +34,8 @@ type poolJSON struct {
 	CreatorID   int16   `json:"creator_id"`
 	CreatorName string  `json:"creator_name"`
 	IsPublic    bool    `json:"is_public"`
+	SortKey     string  `json:"sort_key"`
+	SortOrder   string  `json:"sort_order"`
 	FileCount   int     `json:"file_count"`
 	CreatedAt   string  `json:"created_at"`
 }
@@ -51,6 +53,8 @@ func toPoolJSON(p domain.Pool) poolJSON {
 		CreatorID:   p.CreatorID,
 		CreatorName: p.CreatorName,
 		IsPublic:    p.IsPublic,
+		SortKey:     p.SortKey,
+		SortOrder:   p.SortOrder,
 		FileCount:   p.FileCount,
 		CreatedAt:   p.CreatedAt.UTC().Format(time.RFC3339),
 	}
@@ -160,6 +164,25 @@ func (h *PoolHandler) Get(c *gin.Context) {
 	respondJSON(c, http.StatusOK, toPoolJSON(*p))
 }
 
+// ---------------------------------------------------------------------------
+// POST /pools/:pool_id/views
+// ---------------------------------------------------------------------------
+
+// RecordView logs that the current user viewed the pool (activity.pool_views).
+func (h *PoolHandler) RecordView(c *gin.Context) {
+	id, ok := parsePoolID(c)
+	if !ok {
+		return
+	}
+
+	if err := h.poolSvc.RecordView(c.Request.Context(), id); err != nil {
+		respondError(c, err)
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}
+
 // ---------------------------------------------------------------------------
 // PATCH /pools/:pool_id
 // ---------------------------------------------------------------------------
@@ -195,6 +218,16 @@ func (h *PoolHandler) Update(c *gin.Context) {
 			params.IsPublic = &b
 		}
 	}
+	if v, ok := raw["sort_key"]; ok {
+		if s, ok := v.(string); ok {
+			params.SortKey = &s
+		}
+	}
+	if v, ok := raw["sort_order"]; ok {
+		if s, ok := v.(string); ok {
+			params.SortOrder = &s
+		}
+	}
 
 	updated, err := h.poolSvc.Update(c.Request.Context(), id, params)
 	if err != nil {

backend/internal/handler/router.go

@@ -1,6 +1,7 @@
 package handler
 
 import (
+	"fmt"
 	"net/http"
 	"time"
 
@@ -25,6 +26,7 @@ func NewRouter(
 	auth *AuthMiddleware,
 	authHandler *AuthHandler,
 	fileHandler *FileHandler,
+	duplicateHandler *DuplicateHandler,
 	tagHandler *TagHandler,
 	categoryHandler *CategoryHandler,
 	poolHandler *PoolHandler,
@@ -32,10 +34,20 @@ func NewRouter(
 	aclHandler *ACLHandler,
 	auditHandler *AuditHandler,
 	staticDir string,
-) *gin.Engine {
+	trustedProxies []string,
+) (*gin.Engine, error) {
 	r := gin.New()
 	r.Use(gin.Logger(), gin.Recovery(), securityHeaders())
 
+	// Behind a reverse proxy the client's real IP arrives in X-Forwarded-For.
+	// Trust only the proxy hop(s) so c.ClientIP() — used by the auth rate
+	// limiter — reflects the real client and can't be spoofed by a forged
+	// header from a direct caller. An empty list trusts no proxy (ClientIP is
+	// the immediate peer).
+	if err := r.SetTrustedProxies(trustedProxies); err != nil {
+		return nil, fmt.Errorf("configure trusted proxies: %w", err)
+	}
+
 	// Health check — no auth required.
 	r.GET("/health", func(c *gin.Context) {
 		c.JSON(http.StatusOK, gin.H{"status": "ok"})
@@ -69,9 +81,14 @@ func NewRouter(
 		files.GET("", fileHandler.List)
 		files.POST("", fileHandler.Upload)
 
-		// Bulk + import routes registered before /:id to prevent param collision.
+		// Bulk + import + duplicates routes registered before /:id to prevent
+		// param collision (e.g. "duplicates" being captured as :id).
+		files.GET("/duplicates", duplicateHandler.List)
+		files.POST("/duplicates/dismiss", duplicateHandler.Dismiss)
+		files.POST("/duplicates/resolve", duplicateHandler.Resolve)
 		files.POST("/bulk/tags", fileHandler.BulkSetTags)
 		files.POST("/bulk/delete", fileHandler.BulkDelete)
+		files.POST("/bulk/review", fileHandler.BulkReview)
 		files.POST("/bulk/common-tags", fileHandler.CommonTags)
 		files.POST("/import", fileHandler.Import)
 
@@ -80,8 +97,9 @@ func NewRouter(
 		files.PATCH("/:id", fileHandler.UpdateMeta)
 		files.DELETE("/:id", fileHandler.SoftDelete)
 
-		files.GET("/:id/content", fileHandler.GetContent)
 		files.PUT("/:id/content", fileHandler.ReplaceContent)
+		// Mints a content token (strict auth) for the GET /:id/content route below.
+		files.POST("/:id/content-token", fileHandler.CreateContentToken)
 		files.GET("/:id/thumbnail", fileHandler.GetThumbnail)
 		files.GET("/:id/preview", fileHandler.GetPreview)
 		files.POST("/:id/views", fileHandler.RecordView)
@@ -95,6 +113,15 @@ func NewRouter(
 		files.DELETE("/:id/tags/:tag_id", tagHandler.FileRemoveTag)
 	}
 
+	// Serving an original is the one read that can outlive a 15-minute access
+	// token — a long video streams via repeated Range requests over many minutes.
+	// So this route alone also accepts a file-scoped content token (see
+	// HandleContent), letting the media URL stay valid for the whole playback.
+	media := v1.Group("/files", auth.HandleContent())
+	{
+		media.GET("/:id/content", fileHandler.GetContent)
+	}
+
 	// -------------------------------------------------------------------------
 	// Tags (all require auth)
 	// -------------------------------------------------------------------------
@@ -141,6 +168,7 @@ func NewRouter(
 		pools.GET("/:pool_id", poolHandler.Get)
 		pools.PATCH("/:pool_id", poolHandler.Update)
 		pools.DELETE("/:pool_id", poolHandler.Delete)
+		pools.POST("/:pool_id/views", poolHandler.RecordView)
 
 		// Sub-routes registered before /:pool_id/files to avoid param conflicts.
 		pools.POST("/:pool_id/files/remove", poolHandler.RemoveFiles)
@@ -188,5 +216,5 @@ func NewRouter(
 		r.NoRoute(spaHandler(staticDir))
 	}
 
-	return r
+	return r, nil
 }

backend/internal/handler/router_test.go

@@ -0,0 +1,23 @@
+package handler
+
+import "testing"
+
+// TestNewRouterRegisters builds the router with typed-nil dependencies to assert
+// route registration itself succeeds. Gin panics on a route conflict (e.g. a
+// duplicated method+path or an inconsistent wildcard name) during registration,
+// before any handler runs — so this catches such mistakes without a database.
+// Handlers are never invoked here; method values on nil pointers are fine.
+func TestNewRouterRegisters(t *testing.T) {
+	r, err := NewRouter(
+		(*AuthMiddleware)(nil), (*AuthHandler)(nil),
+		(*FileHandler)(nil), (*DuplicateHandler)(nil), (*TagHandler)(nil), (*CategoryHandler)(nil), (*PoolHandler)(nil),
+		(*UserHandler)(nil), (*ACLHandler)(nil), (*AuditHandler)(nil),
+		"", nil,
+	)
+	if err != nil {
+		t.Fatalf("NewRouter: %v", err)
+	}
+	if r == nil {
+		t.Fatal("NewRouter returned nil engine")
+	}
+}

backend/internal/imagehash/imagehash.go

@@ -0,0 +1,70 @@
+// Package imagehash computes a 64-bit perceptual hash (dHash) of an image and
+// compares two hashes by Hamming distance. It is used for near-duplicate
+// detection: visually similar images (re-encoded, resized, recompressed) produce
+// hashes a small distance apart, while unrelated images are far apart.
+//
+// dHash is chosen for its robustness and simplicity: the image is reduced to a
+// 9×8 grayscale and each pixel is compared to its right-hand neighbour, yielding
+// 64 gradient-direction bits. It tolerates scaling and brightness/contrast
+// changes well, which is exactly what re-encoded duplicates exhibit.
+package imagehash
+
+import (
+	"bytes"
+	"image"
+	_ "image/gif"  // register GIF decoder
+	_ "image/jpeg" // register JPEG decoder
+	_ "image/png"  // register PNG decoder
+	"math/bits"
+
+	"github.com/disintegration/imaging"
+	_ "golang.org/x/image/webp" // register WebP decoder
+)
+
+// hashWidth/hashHeight define the reduced grayscale used for dHash. The extra
+// column (width = height+1) provides the right-hand neighbour for the 64
+// horizontal comparisons that make up the hash.
+const (
+	hashHeight = 8
+	hashWidth  = hashHeight + 1
+)
+
+// FromImage reduces img to a 9×8 grayscale and returns its 64-bit dHash. The
+// uint64 of gradient bits is returned as int64 (a plain bit reinterpretation) so
+// it fits PostgreSQL's bigint; equality and Distance are bitwise, so the signed
+// interpretation never matters.
+func FromImage(img image.Image) int64 {
+	small := imaging.Grayscale(imaging.Resize(img, hashWidth, hashHeight, imaging.Lanczos))
+
+	var hash uint64
+	bit := 0
+	for y := 0; y < hashHeight; y++ {
+		for x := 0; x < hashHeight; x++ {
+			// After Grayscale, R == G == B, so the red channel is the luminance.
+			left := small.Pix[small.PixOffset(x, y)]
+			right := small.Pix[small.PixOffset(x+1, y)]
+			if left < right {
+				hash |= 1 << uint(63-bit)
+			}
+			bit++
+		}
+	}
+	return int64(hash)
+}
+
+// FromBytes decodes data (JPEG/PNG/GIF/WebP) and returns its dHash. ok is false
+// when the bytes are not a decodable image, so callers can simply skip hashing
+// (e.g. leave phash NULL) rather than fail.
+func FromBytes(data []byte) (hash int64, ok bool) {
+	img, _, err := image.Decode(bytes.NewReader(data))
+	if err != nil {
+		return 0, false
+	}
+	return FromImage(img), true
+}
+
+// Distance returns the Hamming distance (0–64) between two hashes: the number of
+// differing bits. 0 means identical; small values mean near-duplicate.
+func Distance(a, b int64) int {
+	return bits.OnesCount64(uint64(a) ^ uint64(b))
+}

backend/internal/imagehash/imagehash_test.go

@@ -0,0 +1,99 @@
+package imagehash
+
+import (
+	"bytes"
+	"image"
+	"image/color"
+	"image/jpeg"
+	"image/png"
+	"math"
+	"testing"
+)
+
+// radial renders a smooth grayscale image whose brightness falls off with
+// distance from (cx, cy). Smooth gradients are the realistic case for perceptual
+// hashing and survive JPEG re-encoding well, so they make stable test fixtures.
+func radial(w, h int, cx, cy float64) image.Image {
+	img := image.NewRGBA(image.Rect(0, 0, w, h))
+	maxD := math.Hypot(float64(w), float64(h))
+	for y := 0; y < h; y++ {
+		for x := 0; x < w; x++ {
+			d := math.Hypot(float64(x)-cx, float64(y)-cy)
+			v := uint8(255 * (1 - d/maxD))
+			img.Set(x, y, color.RGBA{v, v, v, 255})
+		}
+	}
+	return img
+}
+
+func encodePNG(t *testing.T, img image.Image) []byte {
+	t.Helper()
+	var buf bytes.Buffer
+	if err := png.Encode(&buf, img); err != nil {
+		t.Fatalf("png encode: %v", err)
+	}
+	return buf.Bytes()
+}
+
+func encodeJPEG(t *testing.T, img image.Image, quality int) []byte {
+	t.Helper()
+	var buf bytes.Buffer
+	if err := jpeg.Encode(&buf, img, &jpeg.Options{Quality: quality}); err != nil {
+		t.Fatalf("jpeg encode: %v", err)
+	}
+	return buf.Bytes()
+}
+
+// The same image re-encoded as PNG (lossless) and JPEG (lossy) must hash to a
+// small Hamming distance — that is the whole point of a perceptual hash.
+func TestFromBytes_SameImageAcrossEncodings(t *testing.T) {
+	img := radial(64, 64, 32, 32)
+
+	pngHash, ok := FromBytes(encodePNG(t, img))
+	if !ok {
+		t.Fatal("FromBytes(PNG): ok=false")
+	}
+	jpgHash, ok := FromBytes(encodeJPEG(t, img, 90))
+	if !ok {
+		t.Fatal("FromBytes(JPEG): ok=false")
+	}
+
+	if d := Distance(pngHash, jpgHash); d > 8 {
+		t.Errorf("same image, different encodings: distance = %d, want <= 8", d)
+	}
+}
+
+// Visually different images must be far apart, and clearly farther than the same
+// image across encodings.
+func TestDistance_DifferentImagesAreFarApart(t *testing.T) {
+	a := FromImage(radial(64, 64, 32, 32)) // centred
+	b := FromImage(radial(64, 64, 0, 0))   // corner
+
+	same, _ := FromBytes(encodeJPEG(t, radial(64, 64, 32, 32), 90))
+
+	d := Distance(a, b)
+	if d < 12 {
+		t.Errorf("different images: distance = %d, want >= 12", d)
+	}
+	if d <= Distance(a, same) {
+		t.Errorf("different images (%d) not farther than re-encoded same image (%d)", d, Distance(a, same))
+	}
+}
+
+func TestDistance_SymmetricAndZeroForEqual(t *testing.T) {
+	a := FromImage(radial(64, 64, 20, 40))
+	b := FromImage(radial(64, 64, 40, 20))
+
+	if Distance(a, a) != 0 {
+		t.Errorf("Distance(a, a) = %d, want 0", Distance(a, a))
+	}
+	if Distance(a, b) != Distance(b, a) {
+		t.Errorf("Distance not symmetric: %d vs %d", Distance(a, b), Distance(b, a))
+	}
+}
+
+func TestFromBytes_RejectsNonImage(t *testing.T) {
+	if _, ok := FromBytes([]byte("definitely not an image")); ok {
+		t.Error("FromBytes on garbage: ok=true, want false")
+	}
+}

backend/internal/integration/server_test.go

@@ -16,13 +16,17 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"image"
+	"image/jpeg"
 	"io"
 	"mime/multipart"
 	"net"
 	"net/http"
 	"net/http/httptest"
+	"net/url"
 	"os"
 	"path/filepath"
+	"sort"
 	"strings"
 	"testing"
 	"time"
@@ -55,6 +59,9 @@ type harness struct {
 	client    *http.Client
 	importDir string
 	pool      *pgxpool.Pool
+	// dupSvc lets duplicate tests trigger a pairs rescan directly: rebuilding the
+	// pairs table is a CLI/maintenance action with no HTTP endpoint.
+	dupSvc *service.DuplicateService
 }
 
 // setupSuite creates an ephemeral database, runs migrations, wires the full
@@ -110,7 +117,7 @@ func setupSuite(t *testing.T) *harness {
 	thumbsDir := t.TempDir()
 	importDir := t.TempDir()
 
-	diskStorage, err := storage.NewDiskStorage(filesDir, thumbsDir, 160, 160, 1920, 1080)
+	diskStorage, err := storage.NewDiskStorage(filesDir, thumbsDir, 160, 160, 1920, 1080, 0, 0)
 	require.NoError(t, err)
 
 	// --- Repositories --------------------------------------------------------
@@ -124,15 +131,18 @@ func setupSuite(t *testing.T) *harness {
 	tagRuleRepo := postgres.NewTagRuleRepo(pool)
 	categoryRepo := postgres.NewCategoryRepo(pool)
 	poolRepo := postgres.NewPoolRepo(pool)
+	duplicatePairRepo := postgres.NewDuplicatePairRepo(pool)
+	dismissalRepo := postgres.NewDismissalRepo(pool)
 	transactor := postgres.NewTransactor(pool)
 
 	// --- Services ------------------------------------------------------------
-	authSvc := service.NewAuthService(userRepo, sessionRepo, "test-secret", 15*time.Minute, 720*time.Hour)
+	authSvc := service.NewAuthService(userRepo, sessionRepo, "test-secret", 15*time.Minute, 720*time.Hour, 6*time.Hour)
 	aclSvc := service.NewACLService(aclRepo, fileRepo, tagRepo, categoryRepo, poolRepo, transactor)
 	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)
+	duplicateSvc := service.NewDuplicateService(fileRepo, duplicatePairRepo, dismissalRepo, aclSvc, auditSvc, transactor, 10)
 	fileSvc := service.NewFileService(fileRepo, mimeRepo, diskStorage, aclSvc, auditSvc, tagSvc, transactor, importDir)
 	userSvc := service.NewUserService(userRepo, sessionRepo, auditSvc)
 
@@ -143,7 +153,8 @@ func setupSuite(t *testing.T) *harness {
 	// --- Handlers ------------------------------------------------------------
 	authMiddleware := handler.NewAuthMiddleware(authSvc)
 	authHandler := handler.NewAuthHandler(authSvc)
-	fileHandler := handler.NewFileHandler(fileSvc, tagSvc, 500<<20)
+	fileHandler := handler.NewFileHandler(fileSvc, tagSvc, authSvc, 500<<20)
+	duplicateHandler := handler.NewDuplicateHandler(duplicateSvc)
 	tagHandler := handler.NewTagHandler(tagSvc, fileSvc)
 	categoryHandler := handler.NewCategoryHandler(categorySvc)
 	poolHandler := handler.NewPoolHandler(poolSvc)
@@ -151,12 +162,14 @@ func setupSuite(t *testing.T) *harness {
 	aclHandler := handler.NewACLHandler(aclSvc)
 	auditHandler := handler.NewAuditHandler(auditSvc)
 
-	r := handler.NewRouter(
+	r, err := handler.NewRouter(
 		authMiddleware, authHandler,
-		fileHandler, tagHandler, categoryHandler, poolHandler,
+		fileHandler, duplicateHandler, tagHandler, categoryHandler, poolHandler,
 		userHandler, aclHandler, auditHandler,
 		"",
+		nil,
 	)
+	require.NoError(t, err)
 
 	srv := httptest.NewServer(r)
 	t.Cleanup(srv.Close)
@@ -167,6 +180,7 @@ func setupSuite(t *testing.T) *harness {
 		client:    srv.Client(),
 		importDir: importDir,
 		pool:      pool,
+		dupSvc:    duplicateSvc,
 	}
 }
 
@@ -672,6 +686,94 @@ func TestTagRuleActivateApplyToExisting(t *testing.T) {
 	assert.ElementsMatch(t, []string{"animal", "living-thing", "organism"}, tagNames())
 }
 
+// TestTagRuleCreateApplyToExisting verifies that *creating* a rule with
+// apply_to_existing=true retroactively tags existing files — the same contract
+// as activating one (TestTagRuleActivateApplyToExisting), exercised through the
+// POST path. Also checks that apply_to_existing=false and an inactive rule both
+// leave existing files untouched.
+func TestTagRuleCreateApplyToExisting(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	h := setupSuite(t)
+	tok := h.login("admin", "admin")
+
+	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 B→C: active, so it fires transitively once B lands on the file.
+	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())
+
+	// A file carrying only tag A — no A→B rule exists yet.
+	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
+	}
+	assert.ElementsMatch(t, []string{"animal"}, tagNames())
+
+	// Creating an INACTIVE rule, even with apply_to_existing=true, must not tag.
+	resp = h.doJSON("POST", "/tags/"+tagA+"/rules", map[string]any{
+		"then_tag_id":       tagB,
+		"is_active":         false,
+		"apply_to_existing": true,
+	}, tok)
+	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
+	assert.ElementsMatch(t, []string{"animal"}, tagNames(), "inactive rule must not tag existing files")
+
+	// Drop it so we can recreate as active.
+	resp = h.doJSON("DELETE", "/tags/"+tagA+"/rules/"+tagB, nil, tok)
+	require.Equal(t, http.StatusNoContent, resp.StatusCode, resp.String())
+
+	// Creating an ACTIVE rule with apply_to_existing=false leaves the file alone.
+	resp = h.doJSON("POST", "/tags/"+tagA+"/rules", map[string]any{
+		"then_tag_id":       tagB,
+		"is_active":         true,
+		"apply_to_existing": false,
+	}, tok)
+	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
+	assert.ElementsMatch(t, []string{"animal"}, tagNames(), "apply_to_existing=false must not touch existing files")
+
+	resp = h.doJSON("DELETE", "/tags/"+tagA+"/rules/"+tagB, nil, tok)
+	require.Equal(t, http.StatusNoContent, resp.StatusCode, resp.String())
+
+	// Creating A→B active WITH apply_to_existing=true: the file gets B directly
+	// and C transitively via the already-active B→C rule.
+	resp = h.doJSON("POST", "/tags/"+tagA+"/rules", map[string]any{
+		"then_tag_id":       tagB,
+		"is_active":         true,
+		"apply_to_existing": true,
+	}, tok)
+	require.Equal(t, http.StatusCreated, 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() {
@@ -857,6 +959,75 @@ func TestTagSortByCategoryThenName(t *testing.T) {
 	assert.Equal(t, []string{"ant", "zebra", "mid", "solo"}, names)
 }
 
+// TestRecordPoolView verifies that viewing a pool is logged (POST .../views),
+// is repeatable (view history, not a unique flag), and 404s for unknown pools.
+func TestRecordPoolView(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	h := setupSuite(t)
+	ctx := context.Background()
+	adminToken := h.login("admin", "admin")
+
+	resp := h.doJSON("POST", "/pools", map[string]any{"name": "trip"}, adminToken)
+	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
+	var pool map[string]any
+	resp.decode(t, &pool)
+	poolID := pool["id"].(string)
+
+	resp = h.doJSON("POST", "/pools/"+poolID+"/views", nil, adminToken)
+	require.Equal(t, http.StatusNoContent, resp.StatusCode, resp.String())
+
+	// Viewing again logs another history row, not a conflict.
+	resp = h.doJSON("POST", "/pools/"+poolID+"/views", nil, adminToken)
+	require.Equal(t, http.StatusNoContent, resp.StatusCode, resp.String())
+
+	var n int
+	require.NoError(t, h.pool.QueryRow(ctx,
+		`SELECT count(*) FROM activity.pool_views WHERE pool_id = $1`, poolID).Scan(&n))
+	assert.Equal(t, 2, n, "each view should add a history row")
+
+	// Unknown pool id → 404.
+	resp = h.doJSON("POST", "/pools/00000000-0000-0000-0000-000000000000/views", nil, adminToken)
+	require.Equal(t, http.StatusNotFound, resp.StatusCode, resp.String())
+}
+
+// TestTagColorOptional verifies a tag can be created without a colour (stored as
+// NULL rather than the colour input's default) and that an existing colour can
+// be cleared back to none.
+func TestTagColorOptional(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	h := setupSuite(t)
+	adminToken := h.login("admin", "admin")
+
+	// Created without a colour → color is null.
+	resp := h.doJSON("POST", "/tags", map[string]any{"name": "plain"}, adminToken)
+	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
+	var plain map[string]any
+	resp.decode(t, &plain)
+	assert.Nil(t, plain["color"], "tag created without a colour should have null color")
+
+	// Created with a colour → kept verbatim.
+	resp = h.doJSON("POST", "/tags", map[string]any{"name": "red", "color": "aabbcc"}, adminToken)
+	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
+	var red map[string]any
+	resp.decode(t, &red)
+	assert.Equal(t, "aabbcc", red["color"])
+	redID := red["id"].(string)
+
+	// Clearing the colour (color: null) must store NULL — an empty string would
+	// violate the hex CHECK constraint and fail the update.
+	resp = h.doJSON("PATCH", "/tags/"+redID, map[string]any{"color": nil}, adminToken)
+	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
+	var cleared map[string]any
+	resp.decode(t, &cleared)
+	assert.Nil(t, cleared["color"], "cleared colour should be null")
+}
+
 // TestBulkTagAutoRule verifies the bulk add path also applies then_tags.
 func TestBulkTagAutoRule(t *testing.T) {
 	if testing.Short() {
@@ -1136,6 +1307,102 @@ func TestImportFromFolder(t *testing.T) {
 	assert.True(t, ct.Equal(mtime), "content_datetime %v should equal mtime %v", ct, mtime)
 }
 
+// TestImportOrdersByMtime verifies that a folder import processes files in
+// ascending mtime order, regardless of filename order. The three files are named
+// so that alphabetical order (ReadDir's default) is the reverse of mtime order;
+// the progress-event indices must follow mtime, oldest first.
+func TestImportOrdersByMtime(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+	h := setupSuite(t)
+	adminToken := h.login("admin", "admin")
+
+	// name → mtime; alphabetical order (a,b,c) is the reverse of chronological.
+	files := []struct {
+		name  string
+		mtime time.Time
+	}{
+		{"a_newest.jpg", time.Date(2022, 1, 1, 0, 0, 0, 0, time.UTC)},
+		{"b_middle.jpg", time.Date(2021, 1, 1, 0, 0, 0, 0, time.UTC)},
+		{"c_oldest.jpg", time.Date(2019, 1, 1, 0, 0, 0, 0, time.UTC)},
+	}
+	for _, f := range files {
+		p := filepath.Join(h.importDir, f.name)
+		require.NoError(t, os.WriteFile(p, minimalJPEG(), 0o644))
+		require.NoError(t, os.Chtimes(p, f.mtime, f.mtime))
+	}
+
+	resp := h.doJSON("POST", "/files/import", map[string]any{}, adminToken)
+	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
+
+	events := parseImportEvents(t, resp)
+	idx := map[string]int{}
+	for _, ev := range events {
+		if ev.Type == "file" {
+			require.Equal(t, "imported", ev.Status, "%s: %s", ev.Filename, ev.Reason)
+			idx[ev.Filename] = ev.Index
+		}
+	}
+	require.Len(t, idx, 3, resp.String())
+
+	// Oldest first: c (2019) → b (2021) → a (2022).
+	assert.Less(t, idx["c_oldest.jpg"], idx["b_middle.jpg"], "oldest should be processed before middle")
+	assert.Less(t, idx["b_middle.jpg"], idx["a_newest.jpg"], "middle should be processed before newest")
+}
+
+// TestFileReviewStatus verifies the per-file "needs review" flag: new uploads
+// start as needs_review=true, POST /files/bulk/review clears it, and the DSL
+// filter r=0/r=1 selects reviewed/unreviewed files (also combined with others).
+func TestFileReviewStatus(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+	h := setupSuite(t)
+	tok := h.login("admin", "admin")
+
+	file := h.uploadJPEG(tok, "review-me.jpg")
+	fileID := file["id"].(string)
+	assert.Equal(t, true, file["needs_review"], "new upload should need review")
+
+	getReview := func() bool {
+		r := h.doJSON("GET", "/files/"+fileID, nil, tok)
+		require.Equal(t, http.StatusOK, r.StatusCode, r.String())
+		var obj map[string]any
+		r.decode(t, &obj)
+		return obj["needs_review"].(bool)
+	}
+	listIDs := func(dsl string) []string {
+		r := h.doJSON("GET", "/files?filter="+url.QueryEscape(dsl), nil, tok)
+		require.Equal(t, http.StatusOK, r.StatusCode, r.String())
+		var page map[string]any
+		r.decode(t, &page)
+		ids := []string{}
+		for _, it := range page["items"].([]any) {
+			ids = append(ids, it.(map[string]any)["id"].(string))
+		}
+		return ids
+	}
+
+	// Before marking done: appears under r=1 (needs review), not under r=0.
+	assert.True(t, getReview())
+	assert.Contains(t, listIDs("{r=1}"), fileID)
+	assert.NotContains(t, listIDs("{r=0}"), fileID)
+
+	// Mark as reviewed (done) via the bulk endpoint (single-element list).
+	resp := h.doJSON("POST", "/files/bulk/review", map[string]any{
+		"file_ids":     []string{fileID},
+		"needs_review": false,
+	}, tok)
+	require.Equal(t, http.StatusNoContent, resp.StatusCode, resp.String())
+
+	// Now reviewed: appears under r=0, not r=1; combines with a MIME predicate.
+	assert.False(t, getReview(), "file should no longer need review")
+	assert.Contains(t, listIDs("{r=0}"), fileID)
+	assert.NotContains(t, listIDs("{r=1}"), fileID)
+	assert.Contains(t, listIDs("{r=0,&,m~image/%}"), fileID)
+}
+
 // TestContentRangeRequests verifies the original-content endpoint answers a
 // byte-range request with 206 Partial Content (so the browser can seek within
 // audio/video) rather than streaming the whole body.
@@ -1311,41 +1578,25 @@ func TestPoolOperationsRequireACL(t *testing.T) {
 // Test helpers
 // ---------------------------------------------------------------------------
 
-// minimalJPEG returns the bytes of a 1×1 white JPEG image.
+// minimalJPEG returns the bytes of a small solid-white JPEG produced by the
-// Generated offline; no external dependency needed.
+// standard library encoder. Encoding is deterministic, so every call yields
+// byte-identical output — two uploads therefore hash to the same perceptual
+// hash (a solid image dHashes to 0), which is what the duplicate test relies on.
+//
+// It is encoded (rather than a hand-written byte literal) so the bytes decode
+// cleanly through image.Decode: that is the same path FileService.Upload takes
+// to compute the perceptual hash, and a fixture that only passes MIME sniffing
+// but fails to fully decode would leave phash NULL and silently break dedup.
 func minimalJPEG() []byte {
-	// This is a valid minimal JPEG: SOI + APP0 + DQT + SOF0 + DHT + SOS + EOI.
+	img := image.NewGray(image.Rect(0, 0, 16, 16))
-	// 1×1 white pixel, quality ~50. Verified with `file` and browsers.
+	for i := range img.Pix {
-	return []byte{
+		img.Pix[i] = 0xff // white
-		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,
 	}
+	var buf bytes.Buffer
+	if err := jpeg.Encode(&buf, img, &jpeg.Options{Quality: 75}); err != nil {
+		panic("minimalJPEG: encode: " + err.Error())
+	}
+	return buf.Bytes()
 }
 
 // replaceDSNDatabase returns a copy of dsn with the dbname parameter replaced.
@@ -1363,7 +1614,13 @@ func replaceDSNDatabase(dsn, newDB string) string {
 		}
 		return dsn + " dbname=" + newDB
 	}
-	// URL style: not used in our defaults, but handled for completeness.
+	// URL style (e.g. postgres://user:pass@host:port/dbname?opts): the database
+	// is the URL path. CI passes this form via TANABATA_TEST_ADMIN_DSN, so it
+	// must swap the path to point the suite at its per-run database.
+	if u, err := url.Parse(dsn); err == nil {
+		u.Path = "/" + newDB
+		return u.String()
+	}
 	return dsn
 }
 
@@ -1387,3 +1644,223 @@ var (
 	_ = freePort
 	_ = writeFile
 )
+
+// dupListResponse decodes GET /files/duplicates.
+type dupListResponse struct {
+	Items []struct {
+		Files []struct {
+			ID   string `json:"id"`
+			Tags []struct {
+				ID string `json:"id"`
+			} `json:"tags"`
+		} `json:"files"`
+		Distances []struct {
+			A        string `json:"a"`
+			B        string `json:"b"`
+			Distance int    `json:"distance"`
+		} `json:"distances"`
+	} `json:"items"`
+	Total int `json:"total"`
+}
+
+// TestDuplicateDetection exercises the full duplicate lifecycle: perceptual hashes
+// are computed on upload, a rescan builds the pairs table, the cluster surfaces,
+// a field-by-field merge unions tags and trashes the discarded file, and a
+// dismissal hides a pair permanently (surviving a re-rescan).
+//
+// minimalJPEG() is a 1×1 image, so every upload hashes identically — in a fresh
+// database any two uploads form one duplicate pair, which keeps this deterministic.
+func TestDuplicateDetection(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	h := setupSuite(t)
+	ctx := context.Background()
+	admin := h.login("admin", "admin")
+
+	// --- two uploads => one duplicate pair after a rescan ---------------------
+	f1 := h.uploadJPEG(admin, "a.jpg")["id"].(string)
+	f2 := h.uploadJPEG(admin, "b.jpg")["id"].(string)
+
+	// Tag f2 so the merge has something to union onto the survivor.
+	resp := h.doJSON("POST", "/tags", map[string]any{"name": "kept", "is_public": true}, admin)
+	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
+	var tag map[string]any
+	resp.decode(t, &tag)
+	tagID := tag["id"].(string)
+	resp = h.doJSON("PUT", "/files/"+f2+"/tags", map[string]any{"tag_ids": []string{tagID}}, admin)
+	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
+
+	require.NoError(t, h.dupSvc.Rescan(ctx, nil))
+
+	resp = h.doJSON("GET", "/files/duplicates", nil, admin)
+	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
+	var list dupListResponse
+	resp.decode(t, &list)
+	require.Equal(t, 1, list.Total, "expected one duplicate cluster: %s", resp)
+	require.Len(t, list.Items, 1)
+	require.Len(t, list.Items[0].Files, 2)
+	// The pair's stored distance rides along; identical 1×1 uploads are distance 0.
+	require.Len(t, list.Items[0].Distances, 1, "the pair's distance should be reported")
+	assert.Equal(t, 0, list.Items[0].Distances[0].Distance)
+
+	// --- resolve: keep f1, union tags from f2, trash f2 ----------------------
+	resp = h.doJSON("POST", "/files/duplicates/resolve", map[string]any{
+		"keep":             f1,
+		"discard":          f2,
+		"fields":           map[string]any{"tags": "both"},
+		"delete_discarded": true,
+	}, admin)
+	require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
+	var survivor struct {
+		ID   string `json:"id"`
+		Tags []struct {
+			ID string `json:"id"`
+		} `json:"tags"`
+	}
+	resp.decode(t, &survivor)
+	assert.Equal(t, f1, survivor.ID)
+	require.Len(t, survivor.Tags, 1, "survivor should have inherited the discarded file's tag")
+	assert.Equal(t, tagID, survivor.Tags[0].ID)
+
+	// f2 is now trashed, so the pair drops out of the duplicates view.
+	resp = h.doJSON("GET", "/files/duplicates", nil, admin)
+	resp.decode(t, &list)
+	assert.Equal(t, 0, list.Total, "resolved pair should no longer surface: %s", resp)
+
+	// --- dismiss: a new pair, hidden and staying hidden across a rescan -------
+	f3 := h.uploadJPEG(admin, "c.jpg")["id"].(string)
+	require.NoError(t, h.dupSvc.Rescan(ctx, nil))
+
+	resp = h.doJSON("GET", "/files/duplicates", nil, admin)
+	resp.decode(t, &list)
+	require.Equal(t, 1, list.Total, "f1 and f3 should now form a cluster: %s", resp)
+
+	resp = h.doJSON("POST", "/files/duplicates/dismiss", map[string]any{
+		"file_id_a": f1, "file_id_b": f3,
+	}, admin)
+	require.Equal(t, http.StatusNoContent, resp.StatusCode, resp.String())
+
+	resp = h.doJSON("GET", "/files/duplicates", nil, admin)
+	resp.decode(t, &list)
+	assert.Equal(t, 0, list.Total, "dismissed pair should be hidden")
+
+	// A rescan re-finds the pair but the dismissal still hides it.
+	require.NoError(t, h.dupSvc.Rescan(ctx, nil))
+	resp = h.doJSON("GET", "/files/duplicates", nil, admin)
+	resp.decode(t, &list)
+	assert.Equal(t, 0, list.Total, "dismissal must survive a rescan")
+}
+
+// TestPoolAutomaticSort exercises per-pool file ordering: the default manual
+// order, switching to automatic sorts (by name and by creation), that an
+// auto-sorted pool rejects manual reordering, and that keyset paging honours the
+// active sort.
+func TestPoolAutomaticSort(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	h := setupSuite(t)
+	admin := h.login("admin", "admin")
+
+	// Upload three files with distinct names in a non-alphabetical order.
+	idB := h.uploadJPEG(admin, "b.jpg")["id"].(string)
+	idA := h.uploadJPEG(admin, "a.jpg")["id"].(string)
+	idC := h.uploadJPEG(admin, "c.jpg")["id"].(string)
+
+	// "created" order is UUID (byte) order — lexicographic on the canonical string.
+	createdAsc := []string{idA, idB, idC}
+	sort.Strings(createdAsc)
+	createdDesc := []string{createdAsc[2], createdAsc[1], createdAsc[0]}
+
+	// New pool defaults to manual ordering.
+	resp := h.doJSON("POST", "/pools", map[string]any{"name": "sortpool"}, admin)
+	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
+	var pool map[string]any
+	resp.decode(t, &pool)
+	poolID := pool["id"].(string)
+	require.Equal(t, "manual", pool["sort_key"])
+
+	// Add in upload order (b, a, c) → that becomes the manual position order.
+	resp = h.doJSON("POST", "/pools/"+poolID+"/files",
+		map[string]any{"file_ids": []string{idB, idA, idC}}, admin)
+	require.Equal(t, http.StatusCreated, resp.StatusCode, resp.String())
+
+	listIDs := func() []string {
+		resp := h.doJSON("GET", "/pools/"+poolID+"/files", nil, admin)
+		require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
+		var page struct {
+			Items []struct {
+				ID string `json:"id"`
+			} `json:"items"`
+		}
+		resp.decode(t, &page)
+		ids := make([]string, len(page.Items))
+		for i, it := range page.Items {
+			ids[i] = it.ID
+		}
+		return ids
+	}
+
+	setSort := func(key, order string) {
+		body := map[string]any{"sort_key": key}
+		if order != "" {
+			body["sort_order"] = order
+		}
+		resp := h.doJSON("PATCH", "/pools/"+poolID, body, admin)
+		require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
+	}
+
+	// Manual = insertion order.
+	require.Equal(t, []string{idB, idA, idC}, listIDs())
+
+	// By name ascending → a, b, c.
+	setSort("original_name", "asc")
+	require.Equal(t, []string{idA, idB, idC}, listIDs())
+
+	// By creation descending → reverse UUID order.
+	setSort("created", "desc")
+	require.Equal(t, createdDesc, listIDs())
+
+	// Reordering an auto-sorted pool is rejected.
+	resp = h.doJSON("PUT", "/pools/"+poolID+"/files/reorder",
+		map[string]any{"file_ids": []string{idC, idB, idA}}, admin)
+	require.Equal(t, http.StatusBadRequest, resp.StatusCode, resp.String())
+
+	// Back to manual → reordering works again and sticks.
+	setSort("manual", "")
+	resp = h.doJSON("PUT", "/pools/"+poolID+"/files/reorder",
+		map[string]any{"file_ids": []string{idC, idB, idA}}, admin)
+	require.Equal(t, http.StatusNoContent, resp.StatusCode, resp.String())
+	require.Equal(t, []string{idC, idB, idA}, listIDs())
+
+	// Keyset paging (limit 1) under an automatic sort returns the full sequence.
+	setSort("original_name", "asc")
+	var paged []string
+	cursor := ""
+	for i := 0; i < 10; i++ {
+		url := "/pools/" + poolID + "/files?limit=1"
+		if cursor != "" {
+			url += "&cursor=" + cursor
+		}
+		resp := h.doJSON("GET", url, nil, admin)
+		require.Equal(t, http.StatusOK, resp.StatusCode, resp.String())
+		var page struct {
+			Items []struct {
+				ID string `json:"id"`
+			} `json:"items"`
+			NextCursor *string `json:"next_cursor"`
+		}
+		resp.decode(t, &page)
+		for _, it := range page.Items {
+			paged = append(paged, it.ID)
+		}
+		if page.NextCursor == nil {
+			break
+		}
+		cursor = *page.NextCursor
+	}
+	require.Equal(t, []string{idA, idB, idC}, paged)
+}

backend/internal/port/repository.go

@@ -36,6 +36,10 @@ type PoolFileListParams struct {
 	Cursor string
 	Limit  int
 	Filter string // filter DSL expression
+	// SortKey / SortOrder come from the pool itself (not the request) and select
+	// how files are ordered: manual position order or an automatic file-field sort.
+	SortKey   string
+	SortOrder string
 }
 
 // FileRepo is the persistence interface for file records.
@@ -48,6 +52,19 @@ type FileRepo interface {
 	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)
+	// SetNeedsReview sets the review status on the given (non-trashed) files.
+	SetNeedsReview(ctx context.Context, ids []uuid.UUID, value bool) error
+	// SetPHash sets (or clears, when nil) the perceptual hash of a file.
+	SetPHash(ctx context.Context, id uuid.UUID, phash *int64) error
+	// ListMissingPHash returns live image/video files that have no perceptual
+	// hash yet (the dedup backfill work list).
+	ListMissingPHash(ctx context.Context) ([]domain.File, error)
+	// ListAllPHashes returns the id and perceptual hash of every live, hashed
+	// file (the global input to the dedup rescan; not ACL-filtered).
+	ListAllPHashes(ctx context.Context) ([]domain.PHashEntry, error)
+	// CopyPoolMemberships adds targetID to every pool sourceID belongs to,
+	// skipping pools target is already in (used by the duplicate merge).
+	CopyPoolMemberships(ctx context.Context, targetID, sourceID uuid.UUID) 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).
@@ -68,6 +85,21 @@ type FileRepo interface {
 	RecordTagUses(ctx context.Context, userID int16, filterDSL string) error
 }
 
+// DuplicatePairRepo persists the precomputed near-duplicate candidate pairs.
+type DuplicatePairRepo interface {
+	// ReplaceAll atomically replaces the whole pairs table (used by the rescan).
+	ReplaceAll(ctx context.Context, pairs []domain.DuplicatePair) error
+	// ListVisible returns pairs whose both files are live, not dismissed, and
+	// (for non-admins) visible to the viewer.
+	ListVisible(ctx context.Context, viewerID int16, isAdmin bool) ([]domain.DuplicatePair, error)
+}
+
+// DismissalRepo persists "not a duplicate" decisions.
+type DismissalRepo interface {
+	// Add records a pair as dismissed (canonical order, idempotent).
+	Add(ctx context.Context, a, b uuid.UUID, userID int16) error
+}
+
 // TagRepo is the persistence interface for tags.
 type TagRepo interface {
 	List(ctx context.Context, params OffsetParams) (*domain.TagOffsetPage, error)
@@ -101,6 +133,10 @@ type TagRuleRepo interface {
 	// 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
+	// ApplyToExisting retroactively applies the full transitive expansion of
+	// thenTagID (following active rules) to every file that already carries
+	// whenTagID. Used when a rule is created or activated with apply_to_existing.
+	ApplyToExisting(ctx context.Context, whenTagID, thenTagID uuid.UUID) error
 	Delete(ctx context.Context, whenTagID, thenTagID uuid.UUID) error
 }
 
@@ -129,6 +165,9 @@ type PoolRepo interface {
 	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
+
+	// RecordView appends a view-history row (activity.pool_views) for the user.
+	RecordView(ctx context.Context, poolID uuid.UUID, userID int16) error
 }
 
 // UserRepo is the persistence interface for users.

backend/internal/service/auth_service.go

@@ -20,6 +20,11 @@ import (
 const (
 	tokenTypeAccess  = "access"
 	tokenTypeRefresh = "refresh"
+	// tokenTypeContent is a file-scoped capability for reading one file's
+	// content by URL (originals / media streaming). It is not tied to a session,
+	// so it outlives the short access TTL and refresh rotation — letting a long
+	// video keep playing past access-token expiry.
+	tokenTypeContent = "content"
 )
 
 // dummyPasswordHash is a valid bcrypt hash used to equalise the cost of a login
@@ -34,6 +39,8 @@ type Claims struct {
 	IsAdmin   bool   `json:"adm"`
 	SessionID int    `json:"sid"`
 	TokenType string `json:"typ"`
+	// FileID scopes a content token to a single file; empty on access/refresh.
+	FileID string `json:"fid,omitempty"`
 }
 
 // TokenPair holds an issued access/refresh token pair with the access TTL.
@@ -50,6 +57,7 @@ type AuthService struct {
 	secret     []byte
 	accessTTL  time.Duration
 	refreshTTL time.Duration
+	contentTTL time.Duration
 }
 
 // NewAuthService creates an AuthService.
@@ -59,6 +67,7 @@ func NewAuthService(
 	jwtSecret string,
 	accessTTL time.Duration,
 	refreshTTL time.Duration,
+	contentTTL time.Duration,
 ) *AuthService {
 	return &AuthService{
 		users:      users,
@@ -66,6 +75,7 @@ func NewAuthService(
 		secret:     []byte(jwtSecret),
 		accessTTL:  accessTTL,
 		refreshTTL: refreshTTL,
+		contentTTL: contentTTL,
 	}
 }
 
@@ -233,6 +243,53 @@ func (s *AuthService) ValidateAccessToken(ctx context.Context, tokenStr string)
 	return claims, nil
 }
 
+// GenerateContentToken issues a file-scoped capability token authorizing reads of
+// one file's content (originals / media streaming) by URL. Unlike the access
+// token it carries no session and is not validated against one, so it survives
+// refresh rotation and outlives the short access TTL — which is what lets a long
+// video keep playing. It is a bearer credential for that single file until
+// ContentTokenTTL elapses. Returns the signed token and its lifetime in seconds.
+func (s *AuthService) GenerateContentToken(fileID string, userID int16, isAdmin bool) (string, int, error) {
+	jti, err := randomJTI()
+	if err != nil {
+		return "", 0, err
+	}
+	now := time.Now()
+	claims := Claims{
+		RegisteredClaims: jwt.RegisteredClaims{
+			ID:        jti,
+			IssuedAt:  jwt.NewNumericDate(now),
+			ExpiresAt: jwt.NewNumericDate(now.Add(s.contentTTL)),
+		},
+		UserID:    userID,
+		IsAdmin:   isAdmin,
+		TokenType: tokenTypeContent,
+		FileID:    fileID,
+	}
+	signed, err := s.signClaims(claims)
+	if err != nil {
+		return "", 0, err
+	}
+	return signed, int(s.contentTTL.Seconds()), nil
+}
+
+// ValidateContentToken parses a content token and checks it authorizes fileID.
+// It verifies the signature and expiry (via parseToken), the content token type,
+// and that the embedded file ID matches the requested file — so a token minted
+// for one file cannot read another. It is intentionally session-independent (no
+// session lookup), which is what lets it outlive access-token/session rotation.
+// Per-file view permission is still enforced downstream against the token's user.
+func (s *AuthService) ValidateContentToken(tokenStr, fileID string) (*Claims, error) {
+	claims, err := s.parseToken(tokenStr)
+	if err != nil {
+		return nil, domain.ErrUnauthorized
+	}
+	if claims.TokenType != tokenTypeContent || claims.FileID != fileID {
+		return nil, domain.ErrUnauthorized
+	}
+	return claims, nil
+}
+
 // issueToken signs a JWT with the given parameters. A random JWT ID guarantees
 // uniqueness even for tokens minted within the same second.
 func (s *AuthService) issueToken(userID int16, isAdmin bool, sessionID int, ttl time.Duration, tokenType string) (string, error) {
@@ -252,6 +309,11 @@ func (s *AuthService) issueToken(userID int16, isAdmin bool, sessionID int, ttl
 		SessionID: sessionID,
 		TokenType: tokenType,
 	}
+	return s.signClaims(claims)
+}
+
+// signClaims signs claims into an HS256 JWT with the service secret.
+func (s *AuthService) signClaims(claims Claims) (string, error) {
 	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
 	signed, err := token.SignedString(s.secret)
 	if err != nil {

backend/internal/service/auth_service_test.go

@@ -0,0 +1,80 @@
+package service
+
+import (
+	"testing"
+	"time"
+)
+
+// newContentTokenService builds an AuthService for content-token tests. The
+// content-token methods never touch the user/session repos, so nil is fine.
+func newContentTokenService(contentTTL time.Duration) *AuthService {
+	return NewAuthService(nil, nil, "test-secret", 15*time.Minute, 720*time.Hour, contentTTL)
+}
+
+func TestContentTokenRoundTrip(t *testing.T) {
+	s := newContentTokenService(time.Hour)
+	const fid = "11111111-1111-1111-1111-111111111111"
+
+	tok, expiresIn, err := s.GenerateContentToken(fid, 7, true)
+	if err != nil {
+		t.Fatalf("GenerateContentToken: %v", err)
+	}
+	if expiresIn != int(time.Hour.Seconds()) {
+		t.Fatalf("expires_in = %d, want %d", expiresIn, int(time.Hour.Seconds()))
+	}
+
+	claims, err := s.ValidateContentToken(tok, fid)
+	if err != nil {
+		t.Fatalf("ValidateContentToken: %v", err)
+	}
+	if claims.UserID != 7 || !claims.IsAdmin {
+		t.Fatalf("claims user mismatch: uid=%d adm=%v", claims.UserID, claims.IsAdmin)
+	}
+	if claims.FileID != fid || claims.TokenType != tokenTypeContent {
+		t.Fatalf("claims scope mismatch: fid=%q typ=%q", claims.FileID, claims.TokenType)
+	}
+}
+
+func TestContentTokenRejectsOtherFile(t *testing.T) {
+	s := newContentTokenService(time.Hour)
+	tok, _, err := s.GenerateContentToken("11111111-1111-1111-1111-111111111111", 7, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// A token minted for one file must not authorize another.
+	if _, err := s.ValidateContentToken(tok, "22222222-2222-2222-2222-222222222222"); err == nil {
+		t.Fatal("expected rejection for a different file id")
+	}
+}
+
+func TestContentTokenRejectsAccessToken(t *testing.T) {
+	s := newContentTokenService(time.Hour)
+	// An ordinary access token must not pass as a content token (wrong type).
+	access, err := s.issueToken(7, false, 1, 15*time.Minute, tokenTypeAccess)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := s.ValidateContentToken(access, ""); err == nil {
+		t.Fatal("expected rejection of an access token as a content token")
+	}
+}
+
+func TestContentTokenRejectsExpired(t *testing.T) {
+	// Negative TTL → the token is already expired when minted.
+	s := newContentTokenService(-time.Minute)
+	const fid = "11111111-1111-1111-1111-111111111111"
+	tok, _, err := s.GenerateContentToken(fid, 7, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := s.ValidateContentToken(tok, fid); err == nil {
+		t.Fatal("expected rejection of an expired content token")
+	}
+}
+
+func TestContentTokenRejectsGarbage(t *testing.T) {
+	s := newContentTokenService(time.Hour)
+	if _, err := s.ValidateContentToken("not-a-jwt", "11111111-1111-1111-1111-111111111111"); err == nil {
+		t.Fatal("expected rejection of a malformed token")
+	}
+}

backend/internal/service/duplicate_index.go

@@ -0,0 +1,173 @@
+package service
+
+import (
+	"bytes"
+	"math/bits"
+	"sort"
+
+	"github.com/google/uuid"
+
+	"tanabata/backend/internal/domain"
+)
+
+// hamming returns the number of differing bits between two perceptual hashes.
+func hamming(a, b uint64) int { return bits.OnesCount64(a ^ b) }
+
+// bkNode is a node in a BK-tree over Hamming distance. Files that share the exact
+// same hash are collected in ids (a distance-0 collision), so identical images
+// don't degenerate the tree into a chain.
+type bkNode struct {
+	hash     uint64
+	ids      []uuid.UUID
+	children map[int]*bkNode
+}
+
+// bkTree indexes perceptual hashes for sublinear radius queries. Building one and
+// querying every element with a small radius is far cheaper than the O(N²) all-
+// pairs comparison at 100k+ files.
+type bkTree struct{ root *bkNode }
+
+func (t *bkTree) insert(hash uint64, id uuid.UUID) {
+	if t.root == nil {
+		t.root = &bkNode{hash: hash, ids: []uuid.UUID{id}, children: map[int]*bkNode{}}
+		return
+	}
+	node := t.root
+	for {
+		d := hamming(hash, node.hash)
+		if d == 0 {
+			node.ids = append(node.ids, id)
+			return
+		}
+		child, ok := node.children[d]
+		if !ok {
+			node.children[d] = &bkNode{hash: hash, ids: []uuid.UUID{id}, children: map[int]*bkNode{}}
+			return
+		}
+		node = child
+	}
+}
+
+// query visits every node whose hash is within radius of target. The triangle
+// inequality bounds which children can hold a match to [d-radius, d+radius].
+func (t *bkTree) query(target uint64, radius int, visit func(node *bkNode, dist int)) {
+	if t.root == nil {
+		return
+	}
+	stack := []*bkNode{t.root}
+	for len(stack) > 0 {
+		node := stack[len(stack)-1]
+		stack = stack[:len(stack)-1]
+
+		d := hamming(target, node.hash)
+		if d <= radius {
+			visit(node, d)
+		}
+		lo, hi := d-radius, d+radius
+		for cd, child := range node.children {
+			if cd >= lo && cd <= hi {
+				stack = append(stack, child)
+			}
+		}
+	}
+}
+
+// buildPairs returns every unordered pair of files whose hashes are within
+// threshold, each emitted exactly once with FileA < FileB (UUID byte order).
+// onProgress, if set, is called periodically with (processed, total).
+func buildPairs(entries []domain.PHashEntry, threshold int, onProgress func(done, total int)) []domain.DuplicatePair {
+	tree := &bkTree{}
+	for _, e := range entries {
+		tree.insert(uint64(e.PHash), e.ID)
+	}
+
+	var pairs []domain.DuplicatePair
+	total := len(entries)
+	for i := range entries {
+		e := entries[i]
+		tree.query(uint64(e.PHash), threshold, func(node *bkNode, dist int) {
+			for _, other := range node.ids {
+				// Emit each pair once, from the smaller id, which also skips self.
+				if bytes.Compare(e.ID[:], other[:]) < 0 {
+					pairs = append(pairs, domain.DuplicatePair{FileA: e.ID, FileB: other, Distance: dist})
+				}
+			}
+		})
+		if onProgress != nil && (i+1)%1000 == 0 {
+			onProgress(i+1, total)
+		}
+	}
+	if onProgress != nil {
+		onProgress(total, total)
+	}
+	return pairs
+}
+
+// orderedPair returns the two ids in canonical (a < b by UUID byte order) order,
+// matching how the pairs table keys a distance so a lookup hits regardless of the
+// argument order.
+func orderedPair(a, b uuid.UUID) [2]uuid.UUID {
+	if bytes.Compare(a[:], b[:]) > 0 {
+		return [2]uuid.UUID{b, a}
+	}
+	return [2]uuid.UUID{a, b}
+}
+
+// clusterDistances returns the stored Hamming distance for every pair of files in
+// the cluster that has one. Pairs present only transitively have no stored
+// distance and are left out.
+func clusterDistances(files []domain.File, distByPair map[[2]uuid.UUID]int) []PairDistance {
+	var out []PairDistance
+	for i := 0; i < len(files); i++ {
+		for j := i + 1; j < len(files); j++ {
+			if d, ok := distByPair[orderedPair(files[i].ID, files[j].ID)]; ok {
+				out = append(out, PairDistance{A: files[i].ID, B: files[j].ID, Distance: d})
+			}
+		}
+	}
+	return out
+}
+
+// clusterPairs groups pairs into connected components (transitive closure) via
+// union-find. Every returned cluster has at least two files; clusters and the ids
+// within them are sorted by UUID for stable pagination.
+func clusterPairs(pairs []domain.DuplicatePair) [][]uuid.UUID {
+	parent := map[uuid.UUID]uuid.UUID{}
+	var find func(uuid.UUID) uuid.UUID
+	find = func(x uuid.UUID) uuid.UUID {
+		p, ok := parent[x]
+		if !ok {
+			parent[x] = x
+			return x
+		}
+		if p != x {
+			parent[x] = find(p)
+		}
+		return parent[x]
+	}
+	union := func(a, b uuid.UUID) {
+		ra, rb := find(a), find(b)
+		if ra != rb {
+			parent[ra] = rb
+		}
+	}
+	for _, p := range pairs {
+		union(p.FileA, p.FileB)
+	}
+
+	groups := map[uuid.UUID][]uuid.UUID{}
+	for node := range parent {
+		root := find(node)
+		groups[root] = append(groups[root], node)
+	}
+
+	clusters := make([][]uuid.UUID, 0, len(groups))
+	for _, ids := range groups {
+		sort.Slice(ids, func(i, j int) bool { return bytes.Compare(ids[i][:], ids[j][:]) < 0 })
+		clusters = append(clusters, ids)
+	}
+	sort.Slice(clusters, func(i, j int) bool {
+		return bytes.Compare(clusters[i][0][:], clusters[j][0][:]) < 0
+	})
+	return clusters
+}

backend/internal/service/duplicate_service.go

@@ -0,0 +1,384 @@
+package service
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"time"
+
+	"github.com/google/uuid"
+
+	"tanabata/backend/internal/domain"
+	"tanabata/backend/internal/port"
+)
+
+// Merge field source values.
+const (
+	mergeKeep    = "keep"
+	mergeDiscard = "discard"
+	mergeBoth    = "both"
+	mergeMerge   = "merge"
+)
+
+// MergeFields chooses, per field, which file supplies the survivor's value when
+// resolving a duplicate. Scalars accept "keep"/"discard"; metadata also accepts
+// "merge" (shallow object merge, survivor wins on key conflicts); relations
+// (tags, pools) accept "keep"/"both" (union) — there is deliberately no option
+// to drop the survivor's own tags/pools. An empty value defaults to "keep".
+type MergeFields struct {
+	OriginalName    string `json:"original_name"`
+	Notes           string `json:"notes"`
+	ContentDatetime string `json:"content_datetime"`
+	IsPublic        string `json:"is_public"`
+	Metadata        string `json:"metadata"`
+	Tags            string `json:"tags"`
+	Pools           string `json:"pools"`
+}
+
+// MergeSpec is the input to a duplicate resolution: keep one file, fold chosen
+// fields in from the other, and (usually) trash the other.
+type MergeSpec struct {
+	Keep            uuid.UUID
+	Discard         uuid.UUID
+	Fields          MergeFields
+	DeleteDiscarded bool
+}
+
+// normalize fills empty choices with "keep" and rejects unknown values.
+func (m *MergeSpec) normalize() error {
+	scalar := func(v *string) error {
+		if *v == "" {
+			*v = mergeKeep
+		}
+		if *v != mergeKeep && *v != mergeDiscard {
+			return domain.ErrValidation
+		}
+		return nil
+	}
+	relation := func(v *string) error {
+		if *v == "" {
+			*v = mergeKeep
+		}
+		if *v != mergeKeep && *v != mergeBoth {
+			return domain.ErrValidation
+		}
+		return nil
+	}
+	f := &m.Fields
+	if err := scalar(&f.OriginalName); err != nil {
+		return err
+	}
+	if err := scalar(&f.Notes); err != nil {
+		return err
+	}
+	if err := scalar(&f.ContentDatetime); err != nil {
+		return err
+	}
+	if err := scalar(&f.IsPublic); err != nil {
+		return err
+	}
+	if f.Metadata == "" {
+		f.Metadata = mergeKeep
+	}
+	if f.Metadata != mergeKeep && f.Metadata != mergeDiscard && f.Metadata != mergeMerge {
+		return domain.ErrValidation
+	}
+	if err := relation(&f.Tags); err != nil {
+		return err
+	}
+	if err := relation(&f.Pools); err != nil {
+		return err
+	}
+	return nil
+}
+
+// DuplicateService finds near-duplicate clusters and resolves them.
+type DuplicateService struct {
+	files      port.FileRepo
+	pairs      port.DuplicatePairRepo
+	dismissals port.DismissalRepo
+	acl        *ACLService
+	audit      *AuditService
+	tx         port.Transactor
+	threshold  int
+}
+
+// NewDuplicateService creates a DuplicateService. threshold is the maximum
+// Hamming distance for two files to be treated as duplicate candidates.
+func NewDuplicateService(
+	files port.FileRepo,
+	pairs port.DuplicatePairRepo,
+	dismissals port.DismissalRepo,
+	acl *ACLService,
+	audit *AuditService,
+	tx port.Transactor,
+	threshold int,
+) *DuplicateService {
+	return &DuplicateService{
+		files:      files,
+		pairs:      pairs,
+		dismissals: dismissals,
+		acl:        acl,
+		audit:      audit,
+		tx:         tx,
+		threshold:  threshold,
+	}
+}
+
+// Cluster is a group of near-duplicate files together with the pairwise Hamming
+// distances known between them. Distances are read from the stored pairs, so two
+// files linked into the cluster only transitively (through an intermediate) may
+// have no direct distance — that pair is simply omitted.
+type Cluster struct {
+	Files     []domain.File
+	Distances []PairDistance
+}
+
+// PairDistance is the stored Hamming distance between two files of a cluster.
+type PairDistance struct {
+	A        uuid.UUID
+	B        uuid.UUID
+	Distance int
+}
+
+// Clusters returns a page of duplicate clusters visible to the caller. Pairs are
+// read from the precomputed table (no all-pairs scan here) and grouped into
+// connected components; pagination is over whole clusters. Each cluster carries
+// the stored pairwise distances so callers can show how close the files are.
+func (s *DuplicateService) Clusters(ctx context.Context, limit, offset int) (clusters []Cluster, total int, err error) {
+	userID, isAdmin, _ := domain.UserFromContext(ctx)
+
+	pairs, err := s.pairs.ListVisible(ctx, userID, isAdmin)
+	if err != nil {
+		return nil, 0, err
+	}
+	groups := clusterPairs(pairs)
+	total = len(groups)
+
+	if offset < 0 {
+		offset = 0
+	}
+	if offset >= len(groups) {
+		return []Cluster{}, total, nil
+	}
+	end := offset + limit
+	if end > len(groups) || limit <= 0 {
+		end = len(groups)
+	}
+
+	// Index the stored distances once; each page cluster looks up its own pairs.
+	distByPair := make(map[[2]uuid.UUID]int, len(pairs))
+	for _, p := range pairs {
+		distByPair[orderedPair(p.FileA, p.FileB)] = p.Distance
+	}
+
+	out := make([]Cluster, 0, end-offset)
+	for _, ids := range groups[offset:end] {
+		files := make([]domain.File, 0, len(ids))
+		for _, id := range ids {
+			f, err := s.files.GetByID(ctx, id)
+			if err != nil {
+				// A file deleted between the pair read and now just drops out.
+				if errors.Is(err, domain.ErrNotFound) {
+					continue
+				}
+				return nil, 0, err
+			}
+			files = append(files, *f)
+		}
+		if len(files) >= 2 {
+			out = append(out, Cluster{Files: files, Distances: clusterDistances(files, distByPair)})
+		}
+	}
+	return out, total, nil
+}
+
+// Rescan recomputes the entire duplicate_pairs table from the current set of
+// perceptual hashes. It is the only thing that populates the table, so the
+// duplicates view reflects state as of the last rescan. Called by the dedup CLI.
+func (s *DuplicateService) Rescan(ctx context.Context, onProgress func(done, total int)) error {
+	entries, err := s.files.ListAllPHashes(ctx)
+	if err != nil {
+		return err
+	}
+	pairs := buildPairs(entries, s.threshold, onProgress)
+	return s.pairs.ReplaceAll(ctx, pairs)
+}
+
+// Dismiss records two files as "not a duplicate" so the pair stops surfacing.
+// The caller must be able to view both files.
+func (s *DuplicateService) Dismiss(ctx context.Context, a, b uuid.UUID) error {
+	if a == b {
+		return domain.ErrValidation
+	}
+	userID, isAdmin, _ := domain.UserFromContext(ctx)
+	for _, id := range []uuid.UUID{a, b} {
+		f, err := s.files.GetByID(ctx, id)
+		if err != nil {
+			return err
+		}
+		ok, err := s.acl.CanView(ctx, userID, isAdmin, f.CreatorID, f.IsPublic, fileObjectTypeID, id)
+		if err != nil {
+			return err
+		}
+		if !ok {
+			return domain.ErrForbidden
+		}
+	}
+	if err := s.dismissals.Add(ctx, a, b, userID); err != nil {
+		return err
+	}
+	objType := fileObjectType
+	_ = s.audit.Log(ctx, "duplicate_dismiss", &objType, &a, map[string]any{"other": b.String()})
+	return nil
+}
+
+// Resolve merges a duplicate pair: the survivor (keep) takes the chosen fields
+// from the other (discard), and the other is trashed when DeleteDiscarded is set.
+// The caller must be able to edit both files. Returns the updated survivor.
+func (s *DuplicateService) Resolve(ctx context.Context, spec MergeSpec) (*domain.File, error) {
+	if spec.Keep == spec.Discard {
+		return nil, domain.ErrValidation
+	}
+	if err := spec.normalize(); err != nil {
+		return nil, err
+	}
+
+	keep, err := s.files.GetByID(ctx, spec.Keep)
+	if err != nil {
+		return nil, err
+	}
+	discard, err := s.files.GetByID(ctx, spec.Discard)
+	if err != nil {
+		return nil, err
+	}
+
+	userID, isAdmin, _ := domain.UserFromContext(ctx)
+	for _, f := range []*domain.File{keep, discard} {
+		ok, err := s.acl.CanEdit(ctx, userID, isAdmin, f.CreatorID, fileObjectTypeID, f.ID)
+		if err != nil {
+			return nil, err
+		}
+		if !ok {
+			return nil, domain.ErrForbidden
+		}
+	}
+
+	// FileRepo.Update rewrites all editable scalar columns, so build the complete
+	// resolved set (each field from keep or discard) rather than a sparse patch.
+	patch := &domain.File{
+		OriginalName:    pickPtr(spec.Fields.OriginalName, keep.OriginalName, discard.OriginalName),
+		Notes:           pickPtr(spec.Fields.Notes, keep.Notes, discard.Notes),
+		ContentDatetime: pickTime(spec.Fields.ContentDatetime, keep.ContentDatetime, discard.ContentDatetime),
+		IsPublic:        pickBool(spec.Fields.IsPublic, keep.IsPublic, discard.IsPublic),
+		Metadata:        pickMetadata(spec.Fields.Metadata, keep.Metadata, discard.Metadata),
+	}
+
+	var result *domain.File
+	txErr := s.tx.WithTx(ctx, func(ctx context.Context) error {
+		updated, err := s.files.Update(ctx, keep.ID, patch)
+		if err != nil {
+			return err
+		}
+
+		if spec.Fields.Tags == mergeBoth {
+			if err := s.files.SetTags(ctx, keep.ID, unionTagIDs(keep.Tags, discard.Tags)); err != nil {
+				return err
+			}
+			tags, err := s.files.ListTags(ctx, keep.ID)
+			if err != nil {
+				return err
+			}
+			updated.Tags = tags
+		}
+		if spec.Fields.Pools == mergeBoth {
+			if err := s.files.CopyPoolMemberships(ctx, keep.ID, discard.ID); err != nil {
+				return err
+			}
+		}
+		if spec.DeleteDiscarded {
+			if err := s.files.SoftDelete(ctx, discard.ID); err != nil {
+				return err
+			}
+		}
+		result = updated
+		return nil
+	})
+	if txErr != nil {
+		return nil, txErr
+	}
+
+	objType := fileObjectType
+	_ = s.audit.Log(ctx, "file_merge", &objType, &keep.ID, map[string]any{
+		"discard":           spec.Discard.String(),
+		"fields":            spec.Fields,
+		"deleted_discarded": spec.DeleteDiscarded,
+	})
+	return result, nil
+}
+
+// --- field pickers ---------------------------------------------------------
+
+func pickPtr(choice string, keep, discard *string) *string {
+	if choice == mergeDiscard {
+		return discard
+	}
+	return keep
+}
+
+func pickBool(choice string, keep, discard bool) bool {
+	if choice == mergeDiscard {
+		return discard
+	}
+	return keep
+}
+
+func pickTime(choice string, keep, discard time.Time) time.Time {
+	if choice == mergeDiscard {
+		return discard
+	}
+	return keep
+}
+
+func unionTagIDs(a, b []domain.Tag) []uuid.UUID {
+	seen := make(map[uuid.UUID]bool, len(a)+len(b))
+	ids := make([]uuid.UUID, 0, len(a)+len(b))
+	for _, t := range append(append([]domain.Tag{}, a...), b...) {
+		if !seen[t.ID] {
+			seen[t.ID] = true
+			ids = append(ids, t.ID)
+		}
+	}
+	return ids
+}
+
+// pickMetadata returns keep's metadata, discard's, or a shallow merge in which
+// the survivor's keys win on conflict.
+func pickMetadata(choice string, keep, discard json.RawMessage) json.RawMessage {
+	switch choice {
+	case mergeDiscard:
+		return discard
+	case mergeMerge:
+		km := map[string]json.RawMessage{}
+		dm := map[string]json.RawMessage{}
+		_ = json.Unmarshal(keep, &km)
+		_ = json.Unmarshal(discard, &dm)
+		out := make(map[string]json.RawMessage, len(km)+len(dm))
+		for k, v := range dm {
+			out[k] = v
+		}
+		for k, v := range km { // survivor wins
+			out[k] = v
+		}
+		if len(out) == 0 {
+			return keep
+		}
+		b, err := json.Marshal(out)
+		if err != nil {
+			return keep
+		}
+		return b
+	default:
+		return keep
+	}
+}

backend/internal/service/duplicate_test.go

@@ -0,0 +1,152 @@
+package service
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"sort"
+	"testing"
+
+	"github.com/google/uuid"
+
+	"tanabata/backend/internal/domain"
+)
+
+// id builds a deterministic UUID whose byte order matches n, so tests can reason
+// about the canonical (FileA < FileB) ordering buildPairs produces.
+func id(n int) uuid.UUID {
+	return uuid.MustParse(fmt.Sprintf("00000000-0000-0000-0000-%012d", n))
+}
+
+func entry(n int, hash uint64) domain.PHashEntry {
+	return domain.PHashEntry{ID: id(n), PHash: int64(hash)}
+}
+
+// pairKey canonicalises a pair for set comparison regardless of emission order.
+func pairKey(p domain.DuplicatePair) string {
+	a, b := p.FileA, p.FileB
+	if bytes.Compare(a[:], b[:]) > 0 {
+		a, b = b, a
+	}
+	return fmt.Sprintf("%s|%s|%d", a, b, p.Distance)
+}
+
+func TestBuildPairs_ThresholdAndCanonicalOrder(t *testing.T) {
+	entries := []domain.PHashEntry{
+		entry(1, 0x0000000000000000),
+		entry(2, 0x0000000000000001), // distance 1 from #1
+		entry(3, 0x00000000000000FF), // distance 8 from #1, 7 from #2
+		entry(4, 0xFFFFFFFFFFFFFFFF), // distance 64 from #1
+	}
+
+	// Tight threshold: only the distance-1 pair qualifies.
+	got := buildPairs(entries, 2, nil)
+	if len(got) != 1 {
+		t.Fatalf("threshold 2: got %d pairs, want 1: %+v", len(got), got)
+	}
+	if got[0].FileA != id(1) || got[0].FileB != id(2) || got[0].Distance != 1 {
+		t.Errorf("threshold 2: unexpected pair %+v", got[0])
+	}
+	// Canonical order always FileA < FileB.
+	if bytes.Compare(got[0].FileA[:], got[0].FileB[:]) >= 0 {
+		t.Error("pair not in canonical FileA < FileB order")
+	}
+
+	// Looser threshold pulls in #3's pairs but never #4.
+	got8 := buildPairs(entries, 8, nil)
+	want := map[string]bool{
+		pairKey(domain.DuplicatePair{FileA: id(1), FileB: id(2), Distance: 1}): true,
+		pairKey(domain.DuplicatePair{FileA: id(1), FileB: id(3), Distance: 8}): true,
+		pairKey(domain.DuplicatePair{FileA: id(2), FileB: id(3), Distance: 7}): true,
+	}
+	if len(got8) != len(want) {
+		t.Fatalf("threshold 8: got %d pairs, want %d: %+v", len(got8), len(want), got8)
+	}
+	for _, p := range got8 {
+		if !want[pairKey(p)] {
+			t.Errorf("threshold 8: unexpected pair %+v", p)
+		}
+	}
+}
+
+func TestBuildPairs_IdenticalHashesPairAtDistanceZero(t *testing.T) {
+	entries := []domain.PHashEntry{
+		entry(1, 0xABCDABCDABCDABCD),
+		entry(2, 0xABCDABCDABCDABCD),
+	}
+	got := buildPairs(entries, 0, nil)
+	if len(got) != 1 || got[0].Distance != 0 || got[0].FileA != id(1) || got[0].FileB != id(2) {
+		t.Fatalf("identical hashes: got %+v, want one distance-0 pair (1,2)", got)
+	}
+}
+
+func TestClusterPairs_ConnectedComponents(t *testing.T) {
+	pairs := []domain.DuplicatePair{
+		{FileA: id(1), FileB: id(2)},
+		{FileA: id(2), FileB: id(3)}, // transitively joins 1-2-3
+		{FileA: id(5), FileB: id(6)},
+	}
+	clusters := clusterPairs(pairs)
+	if len(clusters) != 2 {
+		t.Fatalf("got %d clusters, want 2: %+v", len(clusters), clusters)
+	}
+	// Sorted by smallest id: {1,2,3} then {5,6}.
+	if len(clusters[0]) != 3 || clusters[0][0] != id(1) || clusters[0][2] != id(3) {
+		t.Errorf("cluster 0 = %v, want [1 2 3]", clusters[0])
+	}
+	if len(clusters[1]) != 2 || clusters[1][0] != id(5) {
+		t.Errorf("cluster 1 = %v, want [5 6]", clusters[1])
+	}
+	// Each cluster's ids are sorted.
+	for _, c := range clusters {
+		if !sort.SliceIsSorted(c, func(i, j int) bool { return bytes.Compare(c[i][:], c[j][:]) < 0 }) {
+			t.Errorf("cluster not sorted: %v", c)
+		}
+	}
+}
+
+func TestPickMetadata_Merge(t *testing.T) {
+	keep := json.RawMessage(`{"a":1,"b":2}`)
+	discard := json.RawMessage(`{"b":9,"c":3}`)
+
+	out := pickMetadata(mergeMerge, keep, discard)
+	var m map[string]int
+	if err := json.Unmarshal(out, &m); err != nil {
+		t.Fatalf("merge result not valid JSON: %v (%s)", err, out)
+	}
+	want := map[string]int{"a": 1, "b": 2, "c": 3} // survivor wins on "b"
+	if fmt.Sprint(m) != fmt.Sprint(want) {
+		t.Errorf("merge = %v, want %v", m, want)
+	}
+
+	if string(pickMetadata(mergeKeep, keep, discard)) != string(keep) {
+		t.Error("keep choice should return survivor metadata unchanged")
+	}
+	if string(pickMetadata(mergeDiscard, keep, discard)) != string(discard) {
+		t.Error("discard choice should return the other file's metadata")
+	}
+}
+
+func TestMergeSpec_Normalize(t *testing.T) {
+	// Empty fields default to "keep".
+	spec := MergeSpec{Keep: id(1), Discard: id(2)}
+	if err := spec.normalize(); err != nil {
+		t.Fatalf("normalize empty: %v", err)
+	}
+	if spec.Fields.OriginalName != mergeKeep || spec.Fields.Tags != mergeKeep || spec.Fields.Metadata != mergeKeep {
+		t.Errorf("empty fields not defaulted to keep: %+v", spec.Fields)
+	}
+
+	// "both" is invalid for a scalar field.
+	bad := MergeSpec{Keep: id(1), Discard: id(2), Fields: MergeFields{Notes: mergeBoth}}
+	if err := bad.normalize(); !errors.Is(err, domain.ErrValidation) {
+		t.Errorf("scalar=both: got %v, want ErrValidation", err)
+	}
+
+	// "discard" is invalid for a relation field.
+	badRel := MergeSpec{Keep: id(1), Discard: id(2), Fields: MergeFields{Tags: mergeDiscard}}
+	if err := badRel.normalize(); !errors.Is(err, domain.ErrValidation) {
+		t.Errorf("relation=discard: got %v, want ErrValidation", err)
+	}
+}

backend/internal/service/file_service.go

@@ -8,6 +8,7 @@ import (
 	"io"
 	"os"
 	"path/filepath"
+	"sort"
 	"strings"
 	"time"
 
@@ -15,6 +16,7 @@ import (
 	"github.com/google/uuid"
 
 	"tanabata/backend/internal/domain"
+	"tanabata/backend/internal/imagehash"
 	"tanabata/backend/internal/port"
 )
 
@@ -153,6 +155,17 @@ func (s *FileService) Upload(ctx context.Context, p UploadParams) (*domain.File,
 	}
 	exifData, exifDatetime := extractMetadata(data, origName, p.ContentDatetimeFallback)
 
+	// Compute a perceptual hash for images so duplicate detection can later match
+	// near-identical files. Best-effort: a decode failure just leaves phash unset
+	// (the dedup CLI backfills it). Video is hashed by that CLI, not inline, to keep
+	// ffmpeg off the upload path.
+	var phash *int64
+	if strings.HasPrefix(mime.Name, "image/") {
+		if h, ok := imagehash.FromBytes(data); ok {
+			phash = &h
+		}
+	}
+
 	// Resolve content datetime: explicit > metadata date > fallback (e.g. import mtime) > zero.
 	var contentDatetime time.Time
 	if p.ContentDatetime != nil {
@@ -186,6 +199,7 @@ func (s *FileService) Upload(ctx context.Context, p UploadParams) (*domain.File,
 			Notes:           p.Notes,
 			Metadata:        p.Metadata,
 			EXIF:            exifData,
+			PHash:           phash,
 			CreatorID:       userID,
 			IsPublic:        p.IsPublic,
 		}
@@ -272,7 +286,17 @@ func (s *FileService) Update(ctx context.Context, id uuid.UUID, p UpdateParams)
 		return nil, domain.ErrForbidden
 	}
 
-	patch := &domain.File{}
+	// The repo rewrites every editable column, so the patch must carry the final
+	// value for each. Seed the fields that have no always-present input in the
+	// editor (original_name, metadata) with their current values so a partial
+	// update that omits them leaves them untouched instead of clearing them. The
+	// remaining scalars are always supplied by the editor (notes uses an explicit
+	// null to clear). The merge path builds its own complete patch and calls the
+	// repo directly, so it is unaffected by this.
+	patch := &domain.File{
+		OriginalName: f.OriginalName,
+		Metadata:     f.Metadata,
+	}
 	if p.OriginalName != nil {
 		patch.OriginalName = p.OriginalName
 	}
@@ -452,6 +476,18 @@ func (s *FileService) Replace(ctx context.Context, id uuid.UUID, p UploadParams)
 		return nil, err
 	}
 
+	// Recompute the perceptual hash from the new content: images inline, anything
+	// else cleared to NULL so the old content's hash never lingers (the dedup CLI
+	// recomputes video). Best-effort, like on upload — phash is recomputable.
+	var phash *int64
+	if strings.HasPrefix(mime.Name, "image/") {
+		if h, ok := imagehash.FromBytes(data); ok {
+			phash = &h
+		}
+	}
+	_ = s.files.SetPHash(ctx, id, phash)
+	updated.PHash = phash
+
 	objType := fileObjectType
 	_ = s.audit.Log(ctx, "file_replace", &objType, &id, nil)
 	return updated, nil
@@ -557,6 +593,47 @@ func (s *FileService) BulkDelete(ctx context.Context, fileIDs []uuid.UUID) error
 	return nil
 }
 
+// SetNeedsReview sets the review status ("needs tagging" vs marked done) on the
+// given files. Each file is checked against edit ACL; files the caller cannot
+// edit, or that do not exist, are skipped (same forgiving semantics as
+// BulkDelete). Authorized files are updated in a single statement and each is
+// audit-logged. Works for one file (single-element slice) or many.
+func (s *FileService) SetNeedsReview(ctx context.Context, ids []uuid.UUID, value bool) error {
+	userID, isAdmin, _ := domain.UserFromContext(ctx)
+
+	authorized := make([]uuid.UUID, 0, len(ids))
+	for _, id := range ids {
+		f, err := s.files.GetByID(ctx, id)
+		if err != nil {
+			if err == domain.ErrNotFound {
+				continue
+			}
+			return err
+		}
+		ok, err := s.acl.CanEdit(ctx, userID, isAdmin, f.CreatorID, fileObjectTypeID, id)
+		if err != nil {
+			return err
+		}
+		if ok {
+			authorized = append(authorized, id)
+		}
+	}
+
+	if len(authorized) == 0 {
+		return nil
+	}
+	if err := s.files.SetNeedsReview(ctx, authorized, value); err != nil {
+		return err
+	}
+
+	objType := fileObjectType
+	details := map[string]any{"needs_review": value}
+	for i := range authorized {
+		_ = s.audit.Log(ctx, "file_review", &objType, &authorized[i], details)
+	}
+	return nil
+}
+
 // ---------------------------------------------------------------------------
 // Import
 // ---------------------------------------------------------------------------
@@ -589,6 +666,23 @@ func (s *FileService) Import(ctx context.Context, path string, onProgress func(I
 		return nil, fmt.Errorf("FileService.Import: read dir %q: %w", dir, err)
 	}
 
+	// Import oldest-first: process entries in ascending mtime order so the
+	// resulting records' creation order matches the files' chronological order.
+	// mtimes are cached once (re-stat'ing per comparison would be wasteful) and
+	// reused below as the content_datetime fallback. Entries whose info can't be
+	// read get a zero time (sort first); they surface their error in the loop.
+	modTimes := make(map[string]time.Time, len(entries))
+	for _, e := range entries {
+		if info, infoErr := e.Info(); infoErr == nil {
+			modTimes[e.Name()] = info.ModTime()
+		}
+	}
+	// SliceStable preserves ReadDir's name order as a deterministic tiebreak for
+	// entries sharing an mtime.
+	sort.SliceStable(entries, func(a, b int) bool {
+		return modTimes[entries[a].Name()].Before(modTimes[entries[b].Name()])
+	})
+
 	emit := func(ev ImportEvent) {
 		if onProgress != nil {
 			onProgress(ev)
@@ -646,10 +740,9 @@ func (s *FileService) Import(ctx context.Context, path string, onProgress func(I
 
 		// Preserve the file's mtime as a content_datetime fallback (used only when
 		// the file has no EXIF date) — once the source is removed below it's the
-		// only date left for non-photo files.
+		// only date left for non-photo files. Reuses the mtime cached for sorting.
 		var mtime *time.Time
-		if info, statErr := entry.Info(); statErr == nil {
+		if t, ok := modTimes[name]; ok {
-			t := info.ModTime()
 			mtime = &t
 		}
 

backend/internal/service/pool_service.go

@@ -13,12 +13,15 @@ import (
 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.
+// PoolParams holds the fields for creating or patching a pool. SortKey and
+// SortOrder are pointers so a patch can leave them unchanged (nil) vs set them.
 type PoolParams struct {
 	Name      string
 	Notes     *string
 	Metadata  json.RawMessage
 	IsPublic  *bool
+	SortKey   *string
+	SortOrder *string
 }
 
 // PoolService handles pool CRUD and pool–file management with ACL + audit.
@@ -82,6 +85,16 @@ func (s *PoolService) authorizeView(ctx context.Context, poolID uuid.UUID) error
 	return nil
 }
 
+// RecordView appends a view-history entry for the current user, enforcing view
+// ACL (you can only record a view of a pool you may see).
+func (s *PoolService) RecordView(ctx context.Context, id uuid.UUID) error {
+	userID, _, _ := domain.UserFromContext(ctx)
+	if err := s.authorizeView(ctx, id); err != nil {
+		return err
+	}
+	return s.pools.RecordView(ctx, id, userID)
+}
+
 // authorizeEdit returns nil if the caller may edit the pool, else ErrForbidden
 // (or ErrNotFound if the pool does not exist).
 func (s *PoolService) authorizeEdit(ctx context.Context, poolID uuid.UUID) error {
@@ -154,6 +167,18 @@ func (s *PoolService) Update(ctx context.Context, id uuid.UUID, p PoolParams) (*
 	if p.IsPublic != nil {
 		patch.IsPublic = *p.IsPublic
 	}
+	if p.SortKey != nil {
+		if !domain.ValidPoolSortKey(*p.SortKey) {
+			return nil, domain.ErrValidation
+		}
+		patch.SortKey = *p.SortKey
+	}
+	if p.SortOrder != nil {
+		if !domain.ValidSortOrder(*p.SortOrder) {
+			return nil, domain.ErrValidation
+		}
+		patch.SortOrder = *p.SortOrder
+	}
 
 	updated, err := s.pools.Update(ctx, id, &patch)
 	if err != nil {
@@ -195,12 +220,24 @@ func (s *PoolService) Delete(ctx context.Context, id uuid.UUID) error {
 // Pool–file operations
 // ---------------------------------------------------------------------------
 
-// ListFiles returns cursor-paginated files within a pool ordered by position,
+// ListFiles returns cursor-paginated files within a pool, enforcing view ACL.
-// enforcing view ACL on the pool.
+// The ordering is the pool's own stored sort setting (manual position order or
+// an automatic file-field sort), not a request parameter.
 func (s *PoolService) ListFiles(ctx context.Context, poolID uuid.UUID, params port.PoolFileListParams) (*domain.PoolFilePage, error) {
-	if err := s.authorizeView(ctx, poolID); err != nil {
+	userID, isAdmin, _ := domain.UserFromContext(ctx)
+	pool, err := s.pools.GetByID(ctx, poolID)
+	if err != nil {
 		return nil, err
 	}
+	ok, err := s.acl.CanView(ctx, userID, isAdmin, pool.CreatorID, pool.IsPublic, poolObjectTypeID, poolID)
+	if err != nil {
+		return nil, err
+	}
+	if !ok {
+		return nil, domain.ErrForbidden
+	}
+	params.SortKey = pool.SortKey
+	params.SortOrder = pool.SortOrder
 	return s.pools.ListFiles(ctx, poolID, params)
 }
 
@@ -232,10 +269,28 @@ func (s *PoolService) RemoveFiles(ctx context.Context, poolID uuid.UUID, fileIDs
 }
 
 // Reorder sets the ordered sequence of file IDs within a pool, enforcing edit
-// ACL on the pool.
+// ACL on the pool. Manual ordering only applies when the pool's sort key is
+// "manual"; reordering an auto-sorted pool is rejected as a validation error.
 func (s *PoolService) Reorder(ctx context.Context, poolID uuid.UUID, fileIDs []uuid.UUID) error {
-	if err := s.authorizeEdit(ctx, poolID); err != nil {
+	userID, isAdmin, _ := domain.UserFromContext(ctx)
+	pool, err := s.pools.GetByID(ctx, poolID)
+	if err != nil {
 		return err
 	}
-	return s.pools.Reorder(ctx, poolID, fileIDs)
+	ok, err := s.acl.CanEdit(ctx, userID, isAdmin, pool.CreatorID, poolObjectTypeID, poolID)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return domain.ErrForbidden
+	}
+	if pool.SortKey != domain.PoolSortManual {
+		return domain.ErrValidation
+	}
+	if err := s.pools.Reorder(ctx, poolID, fileIDs); err != nil {
+		return err
+	}
+	objType := poolObjectType
+	_ = s.audit.Log(ctx, "file_pool_reorder", &objType, &poolID, map[string]any{"count": len(fileIDs)})
+	return nil
 }

backend/internal/service/tag_service.go

@@ -192,16 +192,32 @@ func (s *TagService) ListRules(ctx context.Context, tagID uuid.UUID) ([]domain.T
 	return s.rules.ListByTag(ctx, tagID)
 }
 
-// CreateRule adds a tag rule. If applyToExisting is true, the then_tag is
+// CreateRule adds a tag rule. When the rule is active and applyToExisting is
-// retroactively applied to all files that already carry the when_tag.
+// true, the full transitive expansion of thenTagID is retroactively applied to
-// Retroactive application requires a FileRepo; it is deferred until wired
+// every file already carrying whenTagID — same semantics as activating an
-// in a future iteration (see port.FileRepo.ListByTag).
+// existing rule via SetRuleActive. The insert and retroactive apply run in one
-func (s *TagService) CreateRule(ctx context.Context, whenTagID, thenTagID uuid.UUID, isActive, _ bool) (*domain.TagRule, error) {
+// transaction so a file is never left half-tagged.
-	return s.rules.Create(ctx, domain.TagRule{
+func (s *TagService) CreateRule(ctx context.Context, whenTagID, thenTagID uuid.UUID, isActive, applyToExisting bool) (*domain.TagRule, error) {
+	var created *domain.TagRule
+	err := s.tx.WithTx(ctx, func(ctx context.Context) error {
+		rule, err := s.rules.Create(ctx, domain.TagRule{
 			WhenTagID: whenTagID,
 			ThenTagID: thenTagID,
 			IsActive:  isActive,
 		})
+		if err != nil {
+			return err
+		}
+		created = rule
+		if isActive && applyToExisting {
+			return s.rules.ApplyToExisting(ctx, whenTagID, thenTagID)
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	return created, nil
 }
 
 // SetRuleActive toggles a rule's is_active flag and returns the updated rule.

backend/internal/storage/disk.go

@@ -15,6 +15,9 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
+	"strconv"
+	"strings"
 	"time"
 
 	"github.com/disintegration/imaging"
@@ -38,20 +41,36 @@ type DiskStorage struct {
 	thumbHeight   int
 	previewWidth  int
 	previewHeight int
+	maxPixels     int
+	// genSem bounds concurrent thumbnail/preview generation. Each resize already
+	// fans out across every core (imaging uses GOMAXPROCS), and large sources cost
+	// hundreds of MB to decode, so unbounded parallelism on a burst of big images
+	// pegs the CPU and can exhaust RAM. A buffered channel caps how many run at once.
+	genSem chan struct{}
 }
 
 var _ port.FileStorage = (*DiskStorage)(nil)
 
 // NewDiskStorage creates a DiskStorage and ensures both directories exist.
+//
+// maxPixels caps the source pixel count we will decode in-process (0 → a sane
+// default). concurrency bounds simultaneous generation (≤0 → half the CPUs).
 func NewDiskStorage(
 	filesPath, thumbsPath string,
 	thumbW, thumbH, prevW, prevH int,
+	maxPixels, concurrency 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)
 		}
 	}
+	if maxPixels <= 0 {
+		maxPixels = defaultMaxDecodePixels
+	}
+	if concurrency <= 0 {
+		concurrency = max(1, runtime.GOMAXPROCS(0)/2)
+	}
 	return &DiskStorage{
 		filesPath:     filesPath,
 		thumbsPath:    thumbsPath,
@@ -59,6 +78,8 @@ func NewDiskStorage(
 		thumbHeight:   thumbH,
 		previewWidth:  prevW,
 		previewHeight: prevH,
+		maxPixels:     maxPixels,
+		genSem:        make(chan struct{}, concurrency),
 	}, nil
 }
 
@@ -136,19 +157,39 @@ func (s *DiskStorage) Preview(ctx context.Context, id uuid.UUID) (io.ReadCloser,
 	return s.serveGenerated(ctx, id, s.previewCachePath(id), s.previewWidth, s.previewHeight)
 }
 
+// VideoFrameMiddle decodes a representative frame from the middle of a video
+// (duration/2). The midpoint avoids the shared intros, title cards and black
+// lead-in frames that make a fixed early offset collide across unrelated clips,
+// so it is the right source for the video's perceptual (duplicate-detection)
+// hash. The file must already exist in storage; ffmpeg/ffprobe must be installed.
+// This is not part of port.FileStorage — only the dedup CLI needs it, with a
+// concrete *DiskStorage — so the interface stays lean and ffmpeg stays out of the
+// upload path.
+func (s *DiskStorage) VideoFrameMiddle(ctx context.Context, id uuid.UUID) (image.Image, error) {
+	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)
+	}
+	return extractVideoFrameMiddle(ctx, srcPath)
+}
+
 // ---------------------------------------------------------------------------
 // Internal helpers
 // ---------------------------------------------------------------------------
 
 // serveGenerated is the shared implementation for Thumbnail and Preview. Both
-// fit the source within maxW×maxH with imaging.Fit, preserving the aspect ratio
+// fit the source within maxW×maxH preserving the aspect ratio (no crop, no
-// (no crop, no upscale); they differ only in the configured dimensions.
+// upscale); they differ only in the configured dimensions.
 //
 // Resolution order:
 //  1. Return cached JPEG if present.
-//  2. Decode as still image (JPEG/PNG/GIF via imaging).
+//  2. vipsthumbnail (shrink-on-load; the primary still-image path).
-//  3. Extract a frame with ffmpeg (video files).
+//  3. Pure-Go decode + imaging.Fit (fallback when vips is absent).
-//  4. Solid-colour placeholder (archives, unrecognised formats, etc.).
+//  4. Extract a frame with ffmpeg (video files).
+//  5. 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 {
@@ -164,13 +205,39 @@ func (s *DiskStorage) serveGenerated(ctx context.Context, id uuid.UUID, cachePat
 		return nil, fmt.Errorf("storage: stat %q: %w", srcPath, err)
 	}
 
-	// 1. Try still-image decode (JPEG/PNG/GIF), rejecting decompression bombs.
+	// Bound concurrent generation so a burst of large images can't peg every core
-	// 2. Try video frame extraction via ffmpeg.
+	// or exhaust RAM. Queue here (respecting cancellation) rather than starting
-	// 3. Fall back to placeholder.
+	// the heavy decode immediately.
+	select {
+	case s.genSem <- struct{}{}:
+		defer func() { <-s.genSem }()
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	}
+
+	// Another request may have generated this while we waited on the semaphore.
+	if f, err := os.Open(cachePath); err == nil {
+		return f, nil
+	}
+
+	// Primary path: vipsthumbnail. It shrinks on load (e.g. JPEG DCT scaling), so
+	// even a 200+ Mpx photo is thumbnailed in a fraction of the memory and CPU of a
+	// full in-process decode, writing the final JPEG straight to the cache. Falls
+	// through when vips is absent or can't read the source (e.g. a video).
+	if vipsThumbnailPath != "" {
+		if rc, err := s.vipsThumbnail(ctx, srcPath, cachePath, maxW, maxH); err == nil {
+			return rc, nil
+		}
+	}
+
+	// Fallback pipeline (pure Go):
+	//  1. Still-image decode (JPEG/PNG/GIF), rejecting oversized rasters.
+	//  2. Video frame extraction via ffmpeg.
+	//  3. Solid-colour placeholder.
 	var img image.Image
-	if decoded, err := decodeImageLimited(srcPath); err == nil {
+	if decoded, err := decodeImageLimited(srcPath, s.maxPixels); err == nil {
 		img = imaging.Fit(decoded, maxW, maxH, imaging.Lanczos)
-	} else if frame, err := extractVideoFrame(ctx, srcPath); err == nil {
+	} else if frame, err := extractVideoFrameMiddle(ctx, srcPath); err == nil {
 		img = imaging.Fit(frame, maxW, maxH, imaging.Lanczos)
 	} else {
 		img = placeholder(maxW, maxH)
@@ -221,15 +288,15 @@ func writeCache(cachePath string, img image.Image) (io.ReadCloser, error) {
 	return f, nil
 }
 
-// maxDecodePixels caps the pixel count of an image we are willing to decode
+// defaultMaxDecodePixels is the fallback cap when none is configured. It bounds
-// into memory, bounding the cost of a decompression bomb (a tiny file that
+// the cost of a decompression bomb (a tiny file that expands to an enormous
-// expands to an enormous raster). 64 Mpx is ~ an 8192×8192 image.
+// raster) and the per-image memory; ~300 Mpx covers e.g. a 13000×17000 photo.
-const maxDecodePixels = 64 << 20
+const defaultMaxDecodePixels = 300_000_000
 
 // decodeImageLimited decodes the image at path after first inspecting its header
 // dimensions via image.DecodeConfig (which does not allocate the raster), and
-// refuses images whose pixel count exceeds maxDecodePixels.
+// refuses images whose pixel count exceeds maxPixels.
-func decodeImageLimited(path string) (image.Image, error) {
+func decodeImageLimited(path string, maxPixels int) (image.Image, error) {
 	f, err := os.Open(path)
 	if err != nil {
 		return nil, err
@@ -240,7 +307,7 @@ func decodeImageLimited(path string) (image.Image, error) {
 	if err != nil {
 		return nil, err
 	}
-	if int64(cfg.Width)*int64(cfg.Height) > maxDecodePixels {
+	if int64(cfg.Width)*int64(cfg.Height) > int64(maxPixels) {
 		return nil, fmt.Errorf("image too large to decode: %dx%d", cfg.Width, cfg.Height)
 	}
 	if _, err := f.Seek(0, io.SeekStart); err != nil {
@@ -249,19 +316,80 @@ func decodeImageLimited(path string) (image.Image, error) {
 	return imaging.Decode(f, imaging.AutoOrientation(true))
 }
 
-// extractVideoFrame uses ffmpeg to extract a single frame from a video file.
+// vipsThumbnailPath is the resolved path to the vipsthumbnail CLI, or "" when it
-// It seeks 1 second in (keyframe-accurate fast seek) and pipes the frame out
+// isn't installed — in which case generation falls back to the pure-Go pipeline.
-// as PNG. If the video is shorter than 1 s the seek is silently ignored by
+var vipsThumbnailPath, _ = exec.LookPath("vipsthumbnail")
-// ffmpeg and the first available frame is returned instead.
+
-// Returns an error if ffmpeg is not installed or produces no output. The run is
+// vipsThumbnail generates a JPEG thumbnail with the vipsthumbnail CLI, writing it
-// bounded by a timeout so a malformed file cannot hang the request indefinitely.
+// straight to cachePath via an atomic temp→rename. vips decodes large images at a
-func extractVideoFrame(ctx context.Context, srcPath string) (image.Image, error) {
+// reduced scale (shrink-on-load), so this costs a fraction of the memory and CPU
+// of a full in-process decode. The result is fit within maxW×maxH and never
+// upscaled (the ">" size modifier). Returns an error for inputs vips can't read
+// (e.g. videos) so the caller can fall back.
+func (s *DiskStorage) vipsThumbnail(ctx context.Context, srcPath, cachePath string, maxW, maxH int) (io.ReadCloser, error) {
+	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+
+	tmp, err := os.CreateTemp(filepath.Dir(cachePath), ".vips-*.jpg")
+	if err != nil {
+		return nil, fmt.Errorf("storage: create temp file: %w", err)
+	}
+	tmpName := tmp.Name()
+	_ = tmp.Close()
+
+	cmd := exec.CommandContext(ctx, vipsThumbnailPath,
+		srcPath,
+		"--size", fmt.Sprintf("%dx%d>", maxW, maxH),
+		"--output", tmpName+"[Q=85]",
+	)
+	cmd.Stderr = io.Discard
+
+	if err := cmd.Run(); err != nil {
+		os.Remove(tmpName)
+		return nil, fmt.Errorf("vipsthumbnail: %w", err)
+	}
+	if fi, err := os.Stat(tmpName); err != nil || fi.Size() == 0 {
+		os.Remove(tmpName)
+		return nil, fmt.Errorf("vipsthumbnail: no output produced")
+	}
+	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
+}
+
+// extractVideoFrameMiddle extracts a single frame from the middle of the video
+// (duration/2), falling back to a 1s offset when the duration can't be probed.
+// The midpoint dodges shared intros, title cards and black lead-in frames, and
+// matches the frame used for the perceptual hash so a video's thumbnail/preview
+// shows the same representative frame dedup compared. See extractVideoFrameAt for
+// the mechanics.
+func extractVideoFrameMiddle(ctx context.Context, srcPath string) (image.Image, error) {
+	at := 1.0
+	if d, err := videoDurationSeconds(ctx, srcPath); err == nil && d > 0 {
+		at = d / 2
+	}
+	return extractVideoFrameAt(ctx, srcPath, at)
+}
+
+// extractVideoFrameAt uses ffmpeg to extract a single frame at atSec seconds into
+// the video, piped out as PNG. The fast input seek (-ss before -i) is keyframe-
+// accurate and cheap; if atSec is past the end the seek is silently ignored and
+// the first available frame is returned instead. Returns an error if ffmpeg is
+// not installed or produces no output. The run is bounded by a timeout so a
+// malformed file cannot hang the caller indefinitely.
+func extractVideoFrameAt(ctx context.Context, srcPath string, atSec float64) (image.Image, error) {
 	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
 	defer cancel()
 
 	var out bytes.Buffer
 	cmd := exec.CommandContext(ctx, "ffmpeg",
-		"-ss", "1", // fast input seek; ignored gracefully on short files
+		"-ss", strconv.FormatFloat(atSec, 'f', 3, 64), // fast input seek; ignored gracefully past end
 		"-i", srcPath,
 		"-vframes", "1",
 		"-f", "image2",
@@ -277,6 +405,29 @@ func extractVideoFrame(ctx context.Context, srcPath string) (image.Image, error)
 	return imaging.Decode(&out)
 }
 
+// videoDurationSeconds returns the container duration in seconds via ffprobe.
+// Used to seek to the middle of a clip for perceptual hashing and thumbnails.
+func videoDurationSeconds(ctx context.Context, srcPath string) (float64, error) {
+	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+
+	cmd := exec.CommandContext(ctx, "ffprobe",
+		"-v", "error",
+		"-show_entries", "format=duration",
+		"-of", "default=noprint_wrappers=1:nokey=1",
+		srcPath,
+	)
+	out, err := cmd.Output()
+	if err != nil {
+		return 0, fmt.Errorf("ffprobe duration: %w", err)
+	}
+	d, err := strconv.ParseFloat(strings.TrimSpace(string(out)), 64)
+	if err != nil {
+		return 0, fmt.Errorf("ffprobe duration parse %q: %w", out, err)
+	}
+	return d, nil
+}
+
 // ---------------------------------------------------------------------------
 // Path helpers
 // ---------------------------------------------------------------------------

backend/internal/storage/disk_test.go

@@ -0,0 +1,181 @@
+package storage
+
+import (
+	"bytes"
+	"context"
+	"image"
+	"image/color"
+	"image/png"
+	"io"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/disintegration/imaging"
+	"github.com/google/uuid"
+)
+
+// writeTestImage writes a w×h PNG filled with a distinct (non-placeholder)
+// colour so a generated thumbnail can be told apart from the grey placeholder.
+func writeTestImage(t *testing.T, path string, w, h int) {
+	t.Helper()
+	img := image.NewNRGBA(image.Rect(0, 0, w, h))
+	for y := 0; y < h; y++ {
+		for x := 0; x < w; x++ {
+			img.Set(x, y, color.NRGBA{R: 0xC0, G: 0x10, B: 0x20, A: 0xFF})
+		}
+	}
+	f, err := os.Create(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	if err := png.Encode(f, img); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestDecodeImageLimited(t *testing.T) {
+	dir := t.TempDir()
+	p := filepath.Join(dir, "img.png")
+	writeTestImage(t, p, 100, 80) // 8000 px
+
+	if _, err := decodeImageLimited(p, 4000); err == nil {
+		t.Fatal("expected rejection for an image over the pixel cap")
+	}
+
+	img, err := decodeImageLimited(p, 100000)
+	if err != nil {
+		t.Fatalf("expected decode within the cap, got %v", err)
+	}
+	if b := img.Bounds(); b.Dx() != 100 || b.Dy() != 80 {
+		t.Fatalf("unexpected decoded size %v", b.Size())
+	}
+}
+
+// TestThumbnailGeneratesAndCaches exercises the full generation path (semaphore
+// acquire → decode → fit → encode → cache) and the cache fast path on re-request.
+func TestThumbnailGeneratesAndCaches(t *testing.T) {
+	files := t.TempDir()
+	thumbs := t.TempDir()
+	id := uuid.New()
+	writeTestImage(t, filepath.Join(files, id.String()), 100, 80)
+
+	s, err := NewDiskStorage(files, thumbs, 160, 160, 1920, 1080, 0, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	rc, err := s.Thumbnail(context.Background(), id)
+	if err != nil {
+		t.Fatalf("Thumbnail: %v", err)
+	}
+	data, _ := io.ReadAll(rc)
+	rc.Close()
+
+	out, err := imaging.Decode(bytes.NewReader(data))
+	if err != nil {
+		t.Fatalf("decode thumbnail: %v", err)
+	}
+	// The source fits within 160×160, so it is not upscaled.
+	if b := out.Bounds(); b.Dx() != 100 || b.Dy() != 80 {
+		t.Fatalf("unexpected thumbnail size %v", b.Size())
+	}
+	// Centre pixel should be the source's red, not the grey placeholder.
+	r, g, b, _ := out.At(50, 40).RGBA()
+	if !(r>>8 > g>>8+40 && r>>8 > b>>8+40) {
+		t.Fatalf("thumbnail is not the source image (got r=%d g=%d b=%d) — fell back to placeholder?", r>>8, g>>8, b>>8)
+	}
+
+	// The cache file must now exist, and a second request must serve it.
+	if _, err := os.Stat(s.thumbCachePath(id)); err != nil {
+		t.Fatalf("cache file not written: %v", err)
+	}
+	rc2, err := s.Thumbnail(context.Background(), id)
+	if err != nil {
+		t.Fatalf("Thumbnail (cached): %v", err)
+	}
+	rc2.Close()
+}
+
+// TestThumbnailFallbackWithoutVips forces the pure-Go pipeline (as if vips were
+// not installed) and verifies generation still produces the source image.
+func TestThumbnailFallbackWithoutVips(t *testing.T) {
+	orig := vipsThumbnailPath
+	vipsThumbnailPath = ""
+	t.Cleanup(func() { vipsThumbnailPath = orig })
+
+	files := t.TempDir()
+	thumbs := t.TempDir()
+	id := uuid.New()
+	writeTestImage(t, filepath.Join(files, id.String()), 100, 80)
+
+	s, err := NewDiskStorage(files, thumbs, 160, 160, 1920, 1080, 0, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	rc, err := s.Thumbnail(context.Background(), id)
+	if err != nil {
+		t.Fatalf("Thumbnail: %v", err)
+	}
+	data, _ := io.ReadAll(rc)
+	rc.Close()
+
+	out, err := imaging.Decode(bytes.NewReader(data))
+	if err != nil {
+		t.Fatalf("decode thumbnail: %v", err)
+	}
+	if b := out.Bounds(); b.Dx() != 100 || b.Dy() != 80 {
+		t.Fatalf("unexpected thumbnail size %v", b.Size())
+	}
+	r, g, b, _ := out.At(50, 40).RGBA()
+	if !(r>>8 > g>>8+40 && r>>8 > b>>8+40) {
+		t.Fatalf("fallback produced a placeholder, not the source (r=%d g=%d b=%d)", r>>8, g>>8, b>>8)
+	}
+}
+
+// TestPreviewGeneratesAndCaches verifies Preview runs through the same pipeline
+// with the preview dimensions and its own cache file (not the thumbnail's).
+func TestPreviewGeneratesAndCaches(t *testing.T) {
+	files := t.TempDir()
+	thumbs := t.TempDir()
+	id := uuid.New()
+	// Larger than the thumbnail box but within the preview box, so the preview
+	// keeps full resolution where a thumbnail would shrink it.
+	writeTestImage(t, filepath.Join(files, id.String()), 400, 300)
+
+	s, err := NewDiskStorage(files, thumbs, 160, 160, 1920, 1080, 0, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	rc, err := s.Preview(context.Background(), id)
+	if err != nil {
+		t.Fatalf("Preview: %v", err)
+	}
+	data, _ := io.ReadAll(rc)
+	rc.Close()
+
+	out, err := imaging.Decode(bytes.NewReader(data))
+	if err != nil {
+		t.Fatalf("decode preview: %v", err)
+	}
+	// 400×300 fits within 1920×1080, so the preview is not downscaled.
+	if b := out.Bounds(); b.Dx() != 400 || b.Dy() != 300 {
+		t.Fatalf("unexpected preview size %v", b.Size())
+	}
+	r, g, b, _ := out.At(200, 150).RGBA()
+	if !(r>>8 > g>>8+40 && r>>8 > b>>8+40) {
+		t.Fatalf("preview is not the source image (r=%d g=%d b=%d)", r>>8, g>>8, b>>8)
+	}
+
+	// The preview cache must be written, and the thumbnail cache must not — they
+	// are separate files served by the same code with different dimensions.
+	if _, err := os.Stat(s.previewCachePath(id)); err != nil {
+		t.Fatalf("preview cache not written: %v", err)
+	}
+	if _, err := os.Stat(s.thumbCachePath(id)); err == nil {
+		t.Fatal("thumbnail cache should not exist after a preview-only request")
+	}
+}

backend/migrations/003_data_tables.sql

@@ -55,7 +55,8 @@ CREATE TABLE data.files (
     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)
+    is_deleted       boolean      NOT NULL DEFAULT false, -- soft delete (trash)
+    needs_review     boolean      NOT NULL DEFAULT true   -- tagging not yet marked done; cleared explicitly
 );
 
 CREATE TABLE data.file_tag (
@@ -75,8 +76,17 @@ CREATE TABLE data.pools (
     creator_id smallint     NOT NULL REFERENCES core.users(id)
                             ON UPDATE CASCADE ON DELETE RESTRICT,
     is_public  boolean      NOT NULL DEFAULT false,
+    -- File ordering within the pool. 'manual' keeps the user-defined order in
+    -- data.file_pool.position (drag-to-reorder); any other key sorts the pool's
+    -- files automatically by that file field, in which case reordering is disabled.
+    sort_key   varchar(32)  NOT NULL DEFAULT 'manual',
+    sort_order varchar(4)   NOT NULL DEFAULT 'asc',
 
-    CONSTRAINT uni__pools__name UNIQUE (name)
+    CONSTRAINT uni__pools__name UNIQUE (name),
+    CONSTRAINT chk__pools__sort_key
+        CHECK (sort_key IN ('manual', 'content_datetime', 'created', 'original_name')),
+    CONSTRAINT chk__pools__sort_order
+        CHECK (sort_order IN ('asc', 'desc'))
 );
 
 -- `position` uses integer with gaps (e.g. 1000, 2000, 3000) to allow
@@ -91,6 +101,31 @@ CREATE TABLE data.file_pool (
     PRIMARY KEY (file_id, pool_id)
 );
 
+-- Precomputed near-duplicate candidates (phash Hamming distance <= threshold),
+-- (re)built in full by the dedup rescan. Stored once per unordered pair with a
+-- canonical file_a < file_b ordering so a pair is never duplicated as (a,b)/(b,a).
+CREATE TABLE data.duplicate_pairs (
+    file_a   uuid     NOT NULL REFERENCES data.files(id) ON UPDATE CASCADE ON DELETE CASCADE,
+    file_b   uuid     NOT NULL REFERENCES data.files(id) ON UPDATE CASCADE ON DELETE CASCADE,
+    distance smallint NOT NULL,
+
+    CONSTRAINT chk__duplicate_pairs__order CHECK (file_a < file_b),
+    PRIMARY KEY (file_a, file_b)
+);
+
+-- "Not a duplicate" decisions: a global overlay that hides a candidate pair from
+-- the duplicates view. Survives rescans (the pair may be re-found but stays
+-- hidden). Same canonical file_a < file_b ordering as data.duplicate_pairs.
+CREATE TABLE data.duplicate_dismissals (
+    file_a       uuid        NOT NULL REFERENCES data.files(id) ON UPDATE CASCADE ON DELETE CASCADE,
+    file_b       uuid        NOT NULL REFERENCES data.files(id) ON UPDATE CASCADE ON DELETE CASCADE,
+    dismissed_by smallint    NOT NULL REFERENCES core.users(id) ON UPDATE CASCADE ON DELETE RESTRICT,
+    dismissed_at timestamptz NOT NULL DEFAULT clock_timestamp(),
+
+    CONSTRAINT chk__duplicate_dismissals__order CHECK (file_a < file_b),
+    PRIMARY KEY (file_a, file_b)
+);
+
 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';
@@ -98,6 +133,8 @@ COMMENT ON TABLE  data.files      IS 'Managed files; actual content stored on di
 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 TABLE  data.duplicate_pairs       IS 'Precomputed near-duplicate candidate pairs (perceptual-hash distance)';
+COMMENT ON TABLE  data.duplicate_dismissals  IS 'Pairs marked "not a duplicate"; hidden from the duplicates view';
 
 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';
@@ -109,6 +146,8 @@ COMMENT ON COLUMN data.file_pool.position     IS 'Manual ordering within pool; u
 
 -- +goose Down
 
+DROP TABLE IF EXISTS data.duplicate_dismissals;
+DROP TABLE IF EXISTS data.duplicate_pairs;
 DROP TABLE IF EXISTS data.file_pool;
 DROP TABLE IF EXISTS data.pools;
 DROP TABLE IF EXISTS data.file_tag;

backend/migrations/006_indexes.sql

@@ -20,11 +20,18 @@ 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;
+CREATE INDEX idx__files__needs_review      ON data.files USING btree (id) WHERE needs_review = true;
 
 -- 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.duplicate_pairs / data.duplicate_dismissals
+-- The composite primary keys cover lookups on file_a; these add the file_b side
+-- (used by the ON DELETE CASCADE and by the visibility join on the second file).
+CREATE INDEX idx__duplicate_pairs__file_b      ON data.duplicate_pairs      USING hash (file_b);
+CREATE INDEX idx__duplicate_dismissals__file_b ON data.duplicate_dismissals USING hash (file_b);
+
 -- data.pools
 CREATE INDEX idx__pools__creator_id ON data.pools USING hash (creator_id);
 
@@ -69,11 +76,14 @@ 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__duplicate_dismissals__file_b;
+DROP INDEX IF EXISTS data.idx__duplicate_pairs__file_b;
 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__needs_review;
 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;

backend/migrations/007_seed_data.sql

@@ -20,7 +20,8 @@ INSERT INTO activity.action_types (name) VALUES
     ('user_login'), ('user_logout'),
     -- Files
     ('file_create'), ('file_edit'), ('file_delete'), ('file_restore'),
-    ('file_permanent_delete'), ('file_replace'),
+    ('file_permanent_delete'), ('file_replace'), ('file_review'),
+    ('file_merge'), ('duplicate_dismiss'),
     -- Tags
     ('tag_create'), ('tag_edit'), ('tag_delete'),
     -- Categories
@@ -29,7 +30,7 @@ INSERT INTO activity.action_types (name) VALUES
     ('pool_create'), ('pool_edit'), ('pool_delete'),
     -- Relations
     ('file_tag_add'), ('file_tag_remove'),
-    ('file_pool_add'), ('file_pool_remove'),
+    ('file_pool_add'), ('file_pool_remove'), ('file_pool_reorder'),
     -- ACL
     ('acl_change'),
     -- Admin

docker-compose.yml

@@ -26,6 +26,12 @@ services:
     container_name: tfm
     restart: unless-stopped
 
+    # Give the app time to drain in-flight requests on stop before SIGKILL. Reads
+    # the same SHUTDOWN_TIMEOUT the app uses for its graceful-shutdown deadline
+    # (via env_file below), so the two never drift. Interpolated from .env at
+    # `docker compose` time; defaults to 15s if unset.
+    stop_grace_period: ${SHUTDOWN_TIMEOUT:-15s}
+
     # All application config (secrets, DATABASE_URL, tunables) comes from .env.
     env_file: .env
 
@@ -35,10 +41,23 @@ services:
     environment:
       STATIC_DIR: /app/static
 
-    # The container always listens on 42776 (Dockerfile default); APP_PORT only
+    # Published on loopback only: a reverse proxy on the host (e.g. nginx) fronts
-    # changes the host-published port.
+    # the app and proxies to 127.0.0.1:${APP_PORT}. Binding to 127.0.0.1 keeps the
+    # app off the LAN/WAN — a plain "PORT:42776" would publish on 0.0.0.0 and, since
+    # Docker's DNAT rules sit ahead of the host firewall, bypass ufw/firewalld. The
+    # container always listens on 42776 (Dockerfile default); APP_PORT only changes
+    # the host-published port. Drop the 127.0.0.1 prefix if exposing it directly.
     ports:
-      - "${APP_PORT:-42776}:42776"
+      - "127.0.0.1:${APP_PORT:-42776}:42776"
+
+    # Two-tier networking. `web` is the app's public-facing bridge (reached via the
+    # published loopback port above; it also provides egress, e.g. to a host
+    # Postgres via host.docker.internal). `backend` is the private tier the app
+    # uses to reach the bundled DB. The DB sits only on `backend`, so nothing on
+    # the host-facing side can reach it.
+    networks:
+      - web
+      - backend
 
     # Wait for the bundled DB when the with-db profile is active. When using a
     # host Postgres the db service is disabled, and required:false keeps this
@@ -76,6 +95,10 @@ services:
     # the app at a Postgres running on the host instead.
     profiles: ["with-db"]
 
+    # Private back-end tier only — never on `web`, never published.
+    networks:
+      - backend
+
     environment:
       POSTGRES_DB: ${POSTGRES_DB:-tanabata}
       POSTGRES_USER: ${POSTGRES_USER:-tanabata}
@@ -97,6 +120,55 @@ services:
       timeout: 5s
       retries: 10
 
+  # One-shot maintenance task for duplicate detection: computes missing
+  # perceptual hashes (images + video) and rebuilds the duplicate-pairs table.
+  # It is NOT a daemon — the "tools" profile keeps it out of `docker compose up`;
+  # run it on demand, and it exits when done:
+  #
+  #   docker compose run --rm dedup            # hashes, then rebuild pairs
+  #   docker compose run --rm dedup -pairs     # only rebuild pairs (after uploads)
+  #   docker compose run --rm dedup -hashes    # only backfill hashes
+  #
+  # Reuses the app image, .env, volumes and networks; only the entrypoint differs
+  # (/app/dedup instead of the server). Connects to the same DB the app uses, so
+  # the app's DB (bundled or host) must be reachable when it runs.
+  dedup:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    profiles: ["tools"]
+    env_file: .env
+    networks:
+      - web
+      - backend
+    depends_on:
+      db:
+        condition: service_healthy
+        required: false
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+    user: "${PUID:-42776}:${PGID:-42776}"
+    volumes:
+      - "${FILES_DIR:-app_files}:/data/files"
+      - "${THUMBS_DIR:-app_thumbs}:/data/thumbs"
+    entrypoint: ["/app/dedup"]
+    restart: "no"
+
+networks:
+  # Public-facing bridge for this app. The explicit bridge name (instead of
+  # Docker's random br-<hash>) makes it identifiable on the host for tcpdump and
+  # firewall rules.
+  web:
+    driver_opts:
+      com.docker.network.bridge.name: dk-tanabata
+  # Private back-end tier (app ↔ DB). internal:true drops the gateway so the DB
+  # has no route off-host. Note: Linux caps interface names at 15 chars, and
+  # dk-tanabata-bnd is exactly 15 — a longer app name would need a shorter suffix.
+  backend:
+    internal: true
+    driver_opts:
+      com.docker.network.bridge.name: dk-tanabata-bnd
+
 volumes:
   app_files:
   app_thumbs:

docs/ARCHITECTURE.md

@@ -0,0 +1,180 @@
+# Tanabata File Manager — Architecture
+
+System-level overview of Tanabata File Manager (TFM). For the product-level
+requirements see [REQUIREMENTS.md](REQUIREMENTS.md); for per-side detail see
+[GO_PROJECT_STRUCTURE.md](GO_PROJECT_STRUCTURE.md) (backend) and
+[FRONTEND_STRUCTURE.md](FRONTEND_STRUCTURE.md) (frontend). The full HTTP contract
+lives in [`openapi.yaml`](../openapi.yaml).
+
+## System Context
+
+TFM is a multi-user, tag-based web file manager for images and video. It is a
+single deployable unit — one Docker image that serves both the REST API and the
+built single-page app on one port — plus a PostgreSQL database.
+
+```
+                        ┌───────────────────────────────────────────┐
+   Browser / installed  │  Reverse proxy (nginx, TLS)               │
+   PWA (desktop/mobile) │  host: 443 → 127.0.0.1:${APP_PORT}        │
+        │  HTTPS        └─────────────────────┬─────────────────────┘
+        └─────────────────────────────────────┼──────────────► 127.0.0.1:42776
+                                              │
+                    ┌─────────────────────────▼────────────────────────┐
+                    │  Tanabata container (single image)               │
+                    │                                                  │
+                    │   Go server (Gin)                                │
+                    │    ├─ /api/v1/*   REST API                       │
+                    │    ├─ /health     liveness                       │
+                    │    └─ /*          static SPA + index.html        │
+                    │                     fallback                     │
+                    │                                                  │
+                    │   Disk: /data/files   (originals, name = UUID)   │
+                    │         /data/thumbs  (thumbnail/preview cache)  │
+                    │         /data/import  (server-side import drop)  │
+                    └─────────────────────────┬────────────────────────┘
+                                              │ pgx (private network)
+                                    ┌─────────▼─────────┐
+                                    │  PostgreSQL 14+   │
+                                    │  (bundled or host)│
+                                    └───────────────────┘
+```
+
+Optional companion process: a one-shot **dedup CLI** (same image, different
+entrypoint) that backfills perceptual hashes and rebuilds the duplicate-pairs
+table. It is not a daemon — it is run on demand.
+
+## Components
+
+| Component      | Tech                                                                       | Responsibility                                           |
+| -------------- | -------------------------------------------------------------------------- | -------------------------------------------------------- |
+| Frontend (SPA) | SvelteKit (adapter-static, `ssr=false`), Svelte 5, Tailwind v4, TypeScript | UI, client routing, PWA/offline, calls the REST API      |
+| API server     | Go + Gin, Clean Architecture                                               | REST API, auth, ACL, business logic, thumbnailing, audit |
+| Database       | PostgreSQL 14+ (pgx v5, goose)                                             | All structured data across 4 schemas / 19 tables         |
+| File storage   | Local disk, flat, keyed by UUID                                            | Originals + a regenerable thumbnail/preview cache        |
+| dedup CLI      | Go (same image)                                                            | Offline perceptual-hash backfill + pairs rescan          |
+| Reverse proxy  | nginx (host, not shipped)                                                  | TLS termination, large-body/streaming config             |
+
+## Backend Architecture (Clean Architecture)
+
+Dependencies point inward; no layer imports a layer above it.
+
+```
+handler  →  service  →  port (interfaces)  ←  db/postgres, storage, imagehash
+                ↓
+              domain (entities, value objects, errors) — stdlib only
+```
+
+- **domain** — entities and errors, zero internal imports.
+- **port** — interfaces (repositories, `FileStorage`, `Transactor`).
+- **service** — use cases; the only place business rules live.
+- **handler** — Gin HTTP layer; maps domain errors to HTTP status codes.
+- **db/postgres**, **storage**, **imagehash** — adapters implementing the ports.
+
+Wiring is manual in `cmd/server/main.go` (no DI framework). See
+[GO_PROJECT_STRUCTURE.md](GO_PROJECT_STRUCTURE.md) for the file-by-file layout,
+the transaction/context patterns, and the DI sketch.
+
+## Request Flow (typical authenticated call)
+
+1. The SPA sends `Authorization: Bearer <access token>` to `/api/v1/...`.
+2. Gin middleware runs: security headers → (for `/auth`) per-IP rate limiter →
+   auth middleware validates the JWT and puts `(userID, isAdmin, sessionID)`
+   into the request context.
+3. The handler parses/validates input and calls a service method
+   (`ctx` first arg).
+4. The service enforces ACL via `ACLService`, performs the use case — composing
+   repository calls inside a `Transactor.WithTx` when several writes must be
+   atomic — and writes an audit entry.
+5. Repositories run SQL through pgx (pool or the tx carried in `ctx`).
+6. The handler serializes the result; domain errors are mapped to
+   `{ code, message, details? }` with the right HTTP status.
+
+## Cross-Cutting Concerns
+
+### Authentication & sessions
+
+JWT bearer auth. A short-lived **access token** (15 min default) authorizes API
+calls; a long-lived **refresh token** (30 days default) rotates on use and is
+stored as a hash in `activity.sessions`. A separate **content token** (6 h
+default) is a single-file capability embedded in media URLs so long video keeps
+streaming past access-token expiry. The `/auth` endpoints are rate-limited per
+client IP.
+
+### Authorization (ACL)
+
+Private-by-default. Admins see everything; otherwise access requires a `public`
+flag, creator ownership, or an explicit grant in `acl.permissions` (read / edit).
+All checks are centralized in `ACLService` and applied before reads and writes.
+
+### File storage
+
+Originals are stored flat under `FILES_PATH`, each named by its file UUID (no
+directory tree, no original-name collisions). Thumbnails and previews are a
+**regenerable cache** under `THUMBS_CACHE_PATH`: still images via vipsthumbnail
+(shrink-on-load) with a pure-Go `imaging` fallback, video frames via ffmpeg;
+metadata/EXIF via exiftool with a pure-Go fallback. Uploads are rejected unless
+their sniffed MIME type is whitelisted in `core.mime_types`.
+
+### Near-duplicate detection
+
+Images are dHash-ed (64-bit perceptual hash) inline on upload; video hashes are
+backfilled by the dedup CLI. A rescan rebuilds `data.duplicate_pairs` using a
+BK-tree over Hamming distance (within `DUPLICATE_HASH_THRESHOLD`), and the API
+groups pairs into connected-component clusters. Dismissed pairs are remembered so
+they stop resurfacing. See the duplicate sections in
+[GO_PROJECT_STRUCTURE.md](GO_PROJECT_STRUCTURE.md).
+
+### Audit logging
+
+User-visible actions (file/tag/category/pool CRUD, relations, ACL changes,
+auth, session termination, admin user actions) are recorded in
+`activity.audit_log` against a seeded set of action types.
+
+### Frontend / PWA
+
+Pure client-side SPA: static assets served by the Go binary, with `index.html`
+as the fallback for client routes. Installable PWA with a service worker for
+app-shell caching and optional offline viewing of pinned files. See
+[FRONTEND_STRUCTURE.md](FRONTEND_STRUCTURE.md).
+
+## Data Model
+
+PostgreSQL, four schemas (see `backend/migrations/`):
+
+- **core** — users, MIME whitelist, object types.
+- **data** — categories, tags, tag rules, files, file–tag, pools, file–pool,
+  duplicate pairs, duplicate dismissals.
+- **acl** — per-object permission grants.
+- **activity** — sessions, file/pool views, tag uses, audit log, action types.
+
+Migrations are goose files embedded via `go:embed` and applied automatically on
+server startup, so a fresh database bootstraps itself.
+
+## Deployment
+
+- **One image, one port.** The multi-stage `Dockerfile` builds the SPA (Node
+  stage) and the static Go binary (Go stage), then ships an Alpine runtime with
+  vips-tools / ffmpeg / exiftool and a non-root user. The server serves both the
+  API and the SPA on port **42776** (the sum of the code points of 七夕).
+- **Compose.** `docker-compose.yml` runs the app plus, optionally, a bundled
+  PostgreSQL (`with-db` profile); a host Postgres is supported by leaving the
+  profile empty. The app is published on loopback only and expects a host
+  reverse proxy; the DB sits on a private `internal` network with no route
+  off-host. The dedup CLI is a `tools`-profile, run-on-demand service.
+- **Config.** All runtime config is environment variables, fully documented in
+  [`.env.example`](../.env.example) (1:1 with `config.Config`). Secrets
+  (`JWT_SECRET`, `ADMIN_PASSWORD`, `DATABASE_URL`) are never baked into the image.
+- **First run.** Migrations auto-apply and the initial admin is bootstrapped
+  from `ADMIN_USERNAME` / `ADMIN_PASSWORD`, so setup is: fill `.env`,
+  `docker compose up`.
+
+See [DEPLOY.md](DEPLOY.md) for the production deploy (Gitea Actions → host) and
+the reverse-proxy notes in [README.md](../README.md).
+
+## Design Constraints & Future Direction
+
+- **DDD / Clean Architecture** on the server keeps business rules independent of
+  Gin and pgx.
+- **PostgreSQL-specific adapters are isolated** behind the `port` interfaces (the
+  filter DSL → SQL translation lives in `db/postgres`), leaving room for other
+  database engines in a future version without touching the service layer.

docs/DEPLOY.md

@@ -3,13 +3,16 @@
 Tanabata is deployed by a [Gitea Actions](https://docs.gitea.com/usage/actions/overview)
 workflow ([`.gitea/workflows/deploy.yml`](../.gitea/workflows/deploy.yml)) that
 runs on the **production host itself**. On every push to `master` it updates the
-git clone in `/opt/tanabata` and runs `docker compose up -d --build` there, so the
+git clone in `/opt/tanabata`, runs the test suite (backend + frontend, in
-image is built from the freshly-pushed code and the stack is restarted.
+throwaway toolchain containers), and — only if it passes — runs
+`docker compose up -d --build` there, so the image is built from the
+freshly-pushed code and the stack is restarted.
 
 ```
 push master ──> Gitea (container) ──> act_runner (host, "host" label)
                                           │ git fetch + reset --hard   (in /opt/tanabata)
-                                          └ docker compose up -d --build
+                                          │ run tests (go + node in containers; ephemeral Postgres)
+                                          └ docker compose up -d --build   (only if tests pass)
 ```
 
 The Gitea server runs in a container, but the **runner runs directly on the host**

docs/FRONTEND_STRUCTURE.md

@@ -1,13 +1,21 @@
 # Tanabata File Manager — Frontend Structure
 
+> Frontend counterpart of [ARCHITECTURE.md](ARCHITECTURE.md). This document
+> details the SvelteKit layout, the CSS approach, and the API client.
+
 ## Stack
 
-- **Framework**: SvelteKit (SPA mode, `ssr: false`)
+- **Framework**: SvelteKit in **SPA mode** (`adapter-static`, `ssr = false`),
-- **Language**: TypeScript
+  Svelte 5 (runes)
-- **CSS**: Tailwind CSS + CSS custom properties (hybrid)
+- **Language**: TypeScript (strict)
-- **API types**: Auto-generated via openapi-typescript
+- **Build**: Vite 7
-- **PWA**: Service worker + web manifest
+- **CSS**: Tailwind CSS **v4** via `@tailwindcss/vite` + CSS custom properties
+  (`@theme` in `app.css`) — no `tailwind.config.*` / `postcss.config.*` file
+- **API types**: auto-generated via `openapi-typescript` (`src/lib/api/schema.ts`)
+- **PWA**: service worker + web manifest
 - **Font**: Epilogue (variable weight)
+- **Dev**: `vite-mock-plugin.ts` serves a mock API so the UI can run without the
+  Go backend
 - **Package manager**: npm
 
 ## SPA mode — why SvelteKit without the server
@@ -19,7 +27,7 @@ static assets, and the only backend is the Go API. SvelteKit is used here
 purely as an SPA framework: file-based routing, the client router, and build
 tooling.
 
-**SvelteKit features we *do* use:**
+**SvelteKit features we _do_ use:**
 
 - File-based routing with nested layouts (`admin/` has its own guard) and
   dynamic segments (`[id]`).
@@ -30,11 +38,11 @@ tooling.
   over the still-mounted list via shallow routing, so the browser back button
   dismisses it without reloading the grid. This is the single biggest reason we
   stay on SvelteKit rather than a plain router.
-- `load` functions, used *only* as client-side route guards (auth redirect,
+- `load` functions, used _only_ as client-side route guards (auth redirect,
   admin redirect, `/` → `/files`).
 - `$lib` alias, generated `./$types`, Vite/HMR integration.
 
-**SvelteKit features we deliberately do *not* use** (the "server half"):
+**SvelteKit features we deliberately do _not_ use** (the "server half"):
 
 - SSR / hydration.
 - `+page.server.ts`, `+server.ts` endpoints, form actions — all data goes
@@ -43,7 +51,7 @@ tooling.
   `hooks.client.ts` files exist.
 
 **Decision: stay on SvelteKit, do not migrate to a bare Svelte + router SPA.**
-The project already *is* an SPA, so there is no runtime gain from switching
+The project already _is_ an SPA, so there is no runtime gain from switching
 (adapter-static tree-shakes the unused server bits; the client-runtime size
 difference is negligible). A migration would mean re-implementing nested
 layouts, guards, dynamic params, and — most painfully — shallow routing /
@@ -55,15 +63,7 @@ expect SSR, endpoints, or hooks to do anything here; that is intentional.
 ```
 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
@@ -71,306 +71,173 @@ tanabata/
 └── README.md
 ```
 
-`openapi.yaml` lives at repository root — both backend and frontend
+`openapi.yaml` lives at repository root — both backend and frontend reference
-reference it. The frontend generates types from it; the backend
+it. The frontend generates types from it; the backend implements it.
-validates its handlers against it.
 
 ## Frontend Directory Layout
 
 ```
 frontend/
 ├── package.json
-├── svelte.config.js
+├── svelte.config.js                # adapter-static, fallback: index.html
-├── vite.config.ts
+├── vite.config.ts                  # plugins: tailwindcss(), sveltekit(), mockApiPlugin()
+├── vite-mock-plugin.ts             # dev-only mock API (run the UI without the Go backend)
 ├── tsconfig.json
-├── tailwind.config.ts
-├── postcss.config.js
 │
-├── src/
+├── static/                         # Copied verbatim into the build
-│   ├── app.html                    # Shell HTML (PWA meta, font preload)
+│   ├── manifest.webmanifest        # PWA manifest
-│   ├── app.css                     # Tailwind directives + CSS custom properties
+│   ├── browserconfig.xml
-│   │                               # (no hooks.* — see "SPA mode" above)
+│   ├── robots.txt
-│   │
+│   ├── favicon.ico
-│   ├── lib/                        # Shared code ($lib/ alias)
+│   ├── fonts/
-│   │   │
+│   │   └── Epilogue-VariableFont_wght.ttf
-│   │   ├── api/                    # API client layer
+│   └── images/                     # PWA icons, section icons (svg), login decorations
-│   │   │   ├── 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/
+└── src/
-    ├── favicon.png
+    ├── app.html                    # Shell HTML (PWA meta, font preload)
-    ├── favicon.ico
+    ├── app.css                     # `@import 'tailwindcss'` + `@theme` custom properties
-    ├── manifest.webmanifest        # PWA manifest (name, icons, theme_color)
+    ├── app.d.ts                    # Ambient types
-    ├── images/
+    ├── service-worker.ts           # PWA: app-shell + pinned-file offline cache
-    │   ├── tanabata-left.png       # Login page decorations (from current design)
+    │
-    │   ├── tanabata-right.png
+    ├── lib/                        # Shared code ($lib alias)
-    │   └── icons/                  # PWA icons (192×192, 512×512, etc.)
+    │   ├── index.ts
-    └── fonts/
+    │   │
-        └── Epilogue-VariableFont_wght.ttf
+    │   ├── api/                    # API client layer
+    │   │   ├── client.ts           # fetch wrapper: bearer auth, 401 refresh+retry, error parsing,
+    │   │   │                       # upload-with-progress (XHR), NDJSON streaming; exports `api`
+    │   │   ├── auth.ts             # login, refresh, logout, sessions
+    │   │   ├── tags.ts             # tag + tag-rule calls
+    │   │   ├── categories.ts       # category calls
+    │   │   ├── duplicates.ts       # duplicate list / dismiss / resolve
+    │   │   ├── schema.ts           # AUTO-GENERATED from openapi.yaml (gitignored; do not edit)
+    │   │   └── types.ts            # Friendly aliases: components['schemas'][...]
+    │   │
+    │   ├── components/
+    │   │   ├── layout/
+    │   │   │   ├── Header.svelte        # Section header with sorting controls
+    │   │   │   ├── SelectionBar.svelte  # Floating bar for multi-select actions
+    │   │   │   └── KeyboardHelp.svelte  # Keyboard-shortcut overlay
+    │   │   │
+    │   │   ├── file/
+    │   │   │   ├── FileCard.svelte       # Single thumbnail (160×160, selectable)
+    │   │   │   ├── Thumb.svelte          # Lazy-loaded thumbnail (IntersectionObserver)
+    │   │   │   ├── FileViewer.svelte     # Full-screen viewer with prev/next
+    │   │   │   ├── FileUpload.svelte     # Upload form + drag-and-drop
+    │   │   │   ├── FilterBar.svelte      # DSL filter builder UI
+    │   │   │   ├── MetadataEditor.svelte # Notes / datetime / metadata (nested) editor
+    │   │   │   ├── TagPicker.svelte      # Searchable tag selector (add/remove)
+    │   │   │   ├── PoolPicker.svelte     # Add-to-pool dialog
+    │   │   │   ├── BulkTagEditor.svelte  # Multi-select tag add/remove
+    │   │   │   └── DuplicateMergeDialog.svelte # Field-by-field duplicate resolution
+    │   │   │
+    │   │   ├── tag/
+    │   │   │   ├── TagBadge.svelte       # Colored pill
+    │   │   │   └── TagRuleEditor.svelte  # Auto-tag rule management
+    │   │   │
+    │   │   └── common/
+    │   │       ├── ConfirmDialog.svelte
+    │   │       └── InfiniteScroll.svelte # Below-the-fold lazy loading on scroll
+    │   │
+    │   ├── stores/                  # Svelte stores (global state)
+    │   │   ├── auth.ts              # Current user + JWT tokens (persisted, cross-tab sync)
+    │   │   ├── selection.ts         # Selected item IDs, selection mode
+    │   │   ├── sorting.ts           # Per-section sort key + order (persisted)
+    │   │   ├── theme.ts             # Dark/light theme (persisted)
+    │   │   ├── appSettings.ts       # Misc client-side settings
+    │   │   ├── listScroll.ts        # Restore list scroll position after overlay/back
+    │   │   └── sectionCache.ts      # Cached list snapshots, invalidated on mutation
+    │   │
+    │   └── utils/                   # Pure helpers
+    │       ├── dsl.ts               # Filter DSL builder: UI state → query string
+    │       ├── metadata.ts          # Nested metadata <-> editor rows
+    │       ├── pwa.ts               # PWA reset / update prompt
+    │       └── rovingGrid.svelte.ts # Roving-tabindex keyboard grid navigation
+    │
+    └── routes/                     # SvelteKit file-based routing (guards only in load)
+        ├── +layout.svelte          # Root layout: nav, theme
+        ├── +layout.ts              # ssr=false; root auth guard
+        ├── +page.svelte / +page.ts # / → redirect to /files
+        ├── login/+page.svelte
+        ├── files/
+        │   ├── +page.svelte / +page.ts   # Grid: filter, sort, multi-select, upload
+        │   ├── [id]/+page.svelte          # File view (also opened as shallow-routing overlay)
+        │   ├── duplicates/+page.svelte    # Duplicate clusters
+        │   └── trash/+page.svelte         # Trash: restore / permanent delete
+        ├── tags/        { +page.svelte, new/, [id]/ }
+        ├── categories/  { +page.svelte, new/, [id]/ }
+        ├── pools/       { +page.svelte, new/, [id]/ }
+        ├── settings/+page.svelte          # Profile: name, password, sessions, import path
+        └── admin/
+            ├── +layout.svelte / +layout.ts  # Restrict to admins
+            ├── users/{ +page.svelte, [id]/ }
+            └── audit/+page.svelte
 ```
 
 ## Key Architecture Decisions
 
-### CSS Hybrid: Tailwind + Custom Properties
+### CSS: Tailwind v4 + Custom Properties
 
-Theme colors defined as CSS custom properties in `app.css`:
+Tailwind v4 is configured **in CSS**, not in a JS config file. `app.css` imports
+Tailwind and declares the theme tokens as CSS custom properties inside `@theme`;
+Tailwind then generates utilities (`bg-bg-primary`, `text-text-primary`,
+`font-sans`, …) from those tokens automatically.
 
 ```css
-@tailwind base;
+/* src/app.css */
-@tailwind components;
+@import "tailwindcss";
-@tailwind utilities;
 
-:root {
+@theme {
-  --color-bg-primary: #312F45;
+	--color-bg-primary: #312f45;
 	--color-bg-secondary: #181721;
 	--color-bg-elevated: #111118;
-  --color-accent: #9592B5;
+	--color-accent: #9592b5;
-  --color-accent-hover: #7D7AA4;
+	--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;
-}
+	/* … info / danger / warning / success / nav tokens … */
 
-:root[data-theme="light"] {
+	--font-sans: "Epilogue", sans-serif;
-  --color-bg-primary: #f5f5f5;
-  --color-bg-secondary: #ffffff;
-  /* ... */
 }
 ```
 
-Tailwind references them in `tailwind.config.ts`:
+Dark theme is primary; the light theme overrides the same custom properties.
-
-```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:
+`src/lib/api/client.ts` is a thin fetch wrapper exporting a generic `api`
+object. It attaches the bearer token, transparently handles a single `401`
+refresh-and-retry (deduplicating concurrent refreshes and syncing rotated
+tokens across tabs), parses `{ code, message, details }` errors into `ApiError`,
+and invalidates cached list snapshots on mutation. It also provides
+`uploadWithProgress` (XHR, for upload progress) and `postStream` (NDJSON, for
+the live import progress).
 
 ```ts
-// $lib/api/client.ts
+// $lib/api/client.ts (shape)
-import { authStore } from '$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),
+	get: <T>(path) => request<T>(path),
-  post: <T>(path: string, body?: unknown) =>
+	post: <T>(path, body?) =>
-    request<T>(path, { method: 'POST', body: JSON.stringify(body) }),
+		request<T>(path, { method: "POST", body: JSON.stringify(body) }),
-  patch: <T>(path: string, body?: unknown) =>
+	patch: <T>(path, body?) =>
-    request<T>(path, { method: 'PATCH', body: JSON.stringify(body) }),
+		request<T>(path, { method: "PATCH", body: JSON.stringify(body) }),
-  put: <T>(path: string, body?: unknown) =>
+	put: <T>(path, body?) =>
-    request<T>(path, { method: 'PUT', body: JSON.stringify(body) }),
+		request<T>(path, { method: "PUT", body: JSON.stringify(body) }),
-  delete: <T>(path: string) => request<T>(path, { method: 'DELETE' }),
+	delete: <T>(path) => request<T>(path, { method: "DELETE" }),
-  upload: <T>(path: string, formData: FormData) =>
+	upload: <T>(path, fd) => request<T>(path, { method: "POST", body: fd }),
-    request<T>(path, { method: 'POST', body: formData, headers: {} }),
 };
 ```
 
-Domain-specific modules use it:
+Resource modules (`auth.ts`, `tags.ts`, `categories.ts`, `duplicates.ts`) wrap
-
+`api` with typed helpers. Endpoints without a dedicated module (files, pools,
-```ts
+users, acl, audit) are called through `api.*` directly from their route
-// $lib/api/files.ts
+components.
-import { api } from './client';
-import type { File, FileCursorPage } from './types';
-
-export function listFiles(params: Record<string, string>) {
-  const qs = new URLSearchParams(params).toString();
-  return api.get<FileCursorPage>(`/files?${qs}`);
-}
-
-export function uploadFile(formData: FormData) {
-  return api.upload<File>('/files', formData);
-}
-```
 
 ### Type Generation
 
-Script in `package.json`:
-
 ```json
+// package.json
 {
 	"scripts": {
 		"generate:types": "openapi-typescript ../openapi.yaml -o src/lib/api/schema.ts",
@@ -380,43 +247,30 @@ Script in `package.json`:
 }
 ```
 
-Friendly aliases in `types.ts`:
+`schema.ts` is generated (and gitignored) — never edit it by hand. `types.ts`
+re-exports friendly aliases:
 
 ```ts
-import type { components } from './schema';
+import type { components } from "./schema";
-
+export type File = components["schemas"]["File"];
-export type File = components['schemas']['File'];
+export type Tag = components["schemas"]["Tag"];
-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
+### SPA Mode (build)
-
-`svelte.config.js`:
 
 ```js
-import adapter from '@sveltejs/adapter-static';
+// svelte.config.js
-
+import adapter from "@sveltejs/adapter-static";
-export default {
+export default { kit: { adapter: adapter({ fallback: "index.html" }) } };
-  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).
+The Go backend serves `index.html` for all non-API routes (SPA fallback, see
-In development, Vite dev server proxies `/api` to the Go backend.
+`handler/static.go`). In development the Vite dev server serves the UI and the
+mock plugin (or a proxied Go backend) answers `/api`.
 
 ### PWA
 
-`service-worker.ts` handles:
+`service-worker.ts` handles app-shell caching (HTML/CSS/JS/fonts) and optional
-- App shell caching (HTML, CSS, JS, fonts)
+user-pinned file caching for offline viewing; `utils/pwa.ts` exposes the reset /
-- User-pinned file caching (explicit, via UI button)
+update flow (clear caches and reload from the server, keeping pinned files).
-- Cache versioning and cleanup on update
-- Reset function (clear all caches except pinned files)

docs/GO_PROJECT_STRUCTURE.md

@@ -1,18 +1,28 @@
 # Tanabata File Manager — Go Project Structure
 
+> Backend counterpart of [ARCHITECTURE.md](ARCHITECTURE.md). This document
+> details the Go layout, the layer rules, and the key backend decisions.
+
 ## Stack
 
 - **Router**: Gin
 - **Database**: pgx v5 (pgxpool)
-- **Migrations**: goose v3 + go:embed (auto-migrate on startup)
+- **Migrations**: goose v3 + `go:embed` (auto-applied on startup)
-- **Auth**: JWT (golang-jwt/jwt/v5)
+- **Auth**: JWT (golang-jwt/jwt/v5), Bearer access tokens + rotating refresh tokens
-- **Config**: environment variables via .env (joho/godotenv)
+- **Config**: environment variables via `.env` (joho/godotenv)
-- **Logging**: slog (stdlib, Go 1.21+)
+- **Logging**: slog (stdlib)
-- **Validation**: go-playground/validator/v10
+- **Metadata**: exiftool (external, preferred) with a pure-Go EXIF fallback
-- **EXIF**: rwcarlsen/goexif or dsoprea/go-exif
+  (rwcarlsen/goexif)
-- **Image processing**: disintegration/imaging (thumbnails, previews)
+- **Thumbnails / previews**: vipsthumbnail (external, shrink-on-load) and ffmpeg
+  (video frames), with a pure-Go fallback (disintegration/imaging)
+- **Near-duplicate detection**: 64-bit dHash perceptual hashing + a BK-tree /
+  Hamming-distance pairing (`internal/imagehash`, `internal/service/duplicate_*`)
 - **Architecture**: Clean Architecture (domain → service → repository/handler)
 
+The binary is fully static (`CGO_ENABLED=0`). External tools are invoked as
+subprocesses when present and are optional — the pure-Go paths keep the server
+working without them.
+
 ## Monorepo Layout
 
 ```
@@ -31,81 +41,98 @@ tanabata/
 ```
 backend/
 ├── cmd/
-│   └── server/
+│   ├── server/
-│       └── main.go                     # Entrypoint: config → DB → migrate → wire → run
+│   │   └── main.go                     # Entrypoint: config → DB → migrate → bootstrap admin → wire → serve
+│   └── dedup/
+│       └── main.go                     # Offline maintenance CLI: perceptual-hash backfill + duplicate-pairs rescan
 │
 ├── internal/
 │   │
-│   ├── domain/                         # Pure business entities & value objects
+│   ├── domain/                         # Pure business entities & value objects (stdlib only)
-│   │   ├── file.go                     # File, FileFilter, FilePage
+│   │   ├── file.go                     # File, FileFilter, FileListParams, 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.)
+│   │   ├── duplicate.go                # DuplicatePair, PHashEntry
+│   │   ├── context.go                  # WithUser / UserFromContext (identity + session in ctx)
+│   │   └── errors.go                   # Domain error types (ErrNotFound, ErrForbidden, …)
 │   │
 │   ├── port/                           # Interfaces (ports) — contracts between layers
-│   │   ├── repository.go              # FileRepo, TagRepo, CategoryRepo, PoolRepo,
+│   │   ├── repository.go               # Transactor, FileRepo, TagRepo, TagRuleRepo, CategoryRepo,
-│   │   │                               # UserRepo, SessionRepo, ACLRepo, AuditRepo,
+│   │   │                               # PoolRepo, UserRepo, SessionRepo, ACLRepo, AuditRepo,
-│   │   │                               # MimeRepo, TagRuleRepo
+│   │   │                               # MimeRepo, DuplicatePairRepo, DismissalRepo
-│   │   └── storage.go                 # FileStorage interface (disk operations)
+│   │   └── storage.go                  # FileStorage (originals + thumbnail/preview cache)
 │   │
 │   ├── service/                        # Business logic (use cases)
-│   │   ├── file_service.go             # Upload, update, delete, trash/restore, replace,
+│   │   ├── file_service.go             # Upload, update, delete, trash/restore, replace, import, filter/list
-│   │   │                               # import, filter/list, duplicate detection
+│   │   ├── tag_service.go              # CRUD + auto-tag (rule) application
-│   │   ├── tag_service.go              # CRUD + auto-tag application logic
+│   │   ├── category_service.go         # CRUD (thin: repo + ACL + audit)
-│   │   ├── 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
+│   │   ├── auth_service.go             # Login, logout, JWT issue/refresh, content tokens, sessions
 │   │   ├── acl_service.go              # Permission checks, grant/revoke
 │   │   ├── audit_service.go            # Log actions, query audit log
-│   │   └── user_service.go             # Profile update, admin CRUD, block/unblock
+│   │   ├── user_service.go             # Profile update, admin CRUD, block/unblock, EnsureAdmin
+│   │   ├── duplicate_service.go        # Cluster / resolve (merge) / dismiss + rescan orchestration
+│   │   ├── duplicate_index.go          # BK-tree, Hamming pairing, connected-component clustering
+│   │   └── metadata.go                 # EXIF / media metadata extraction (exiftool + pure-Go fallback)
 │   │
 │   ├── handler/                        # HTTP layer (Gin handlers)
-│   │   ├── router.go                   # Route registration, middleware wiring
+│   │   ├── router.go                   # Route registration, middleware, security headers, SPA fallback
-│   │   ├── middleware.go               # Auth middleware (JWT extraction → context)
+│   │   ├── middleware.go               # Auth middleware (JWT / content token → context)
-│   │   ├── request.go                  # Common request parsing helpers
+│   │   ├── ratelimit.go                # Per-IP token-bucket limiter for /auth
-│   │   ├── response.go                 # Error/success response builders
+│   │   ├── response.go                 # Error/success builders, domain-error → HTTP mapping
+│   │   ├── static.go                   # Built SPA serving + index.html fallback
 │   │   ├── file_handler.go             # /files endpoints
-│   │   ├── tag_handler.go              # /tags endpoints
+│   │   ├── duplicate_handler.go        # /files/duplicates endpoints
+│   │   ├── tag_handler.go              # /tags endpoints (+ file–tag relations)
 │   │   ├── 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
+│   │   └── audit_handler.go            # /audit endpoint
 │   │
 │   ├── db/                             # Database adapters
-│   │   ├── db.go                       # Common helpers: pagination, repo factory, transactor base
+│   │   ├── db.go                       # Shared helpers: Querier, tx-from-context, ScanRow, limit/offset clamps
 │   │   └── postgres/                   # PostgreSQL implementation
-│   │       ├── postgres.go             # pgxpool init, tx-from-context helpers
+│   │       ├── postgres.go             # pgxpool init, Transactor, conn-or-tx helper
-│   │       ├── file_repo.go            # FileRepo implementation
+│   │       ├── file_repo.go            # FileRepo (incl. perceptual-hash projections)
-│   │       ├── tag_repo.go             # TagRepo + TagRuleRepo implementation
+│   │       ├── tag_repo.go             # TagRepo + TagRuleRepo
-│   │       ├── category_repo.go        # CategoryRepo implementation
+│   │       ├── category_repo.go        # CategoryRepo
-│   │       ├── pool_repo.go            # PoolRepo implementation
+│   │       ├── pool_repo.go            # PoolRepo
-│   │       ├── user_repo.go            # UserRepo implementation
+│   │       ├── user_repo.go            # UserRepo
-│   │       ├── session_repo.go         # SessionRepo implementation
+│   │       ├── session_repo.go         # SessionRepo
-│   │       ├── acl_repo.go             # ACLRepo implementation
+│   │       ├── acl_repo.go             # ACLRepo
-│   │       ├── audit_repo.go           # AuditRepo implementation
+│   │       ├── audit_repo.go           # AuditRepo
-│   │       ├── mime_repo.go            # MimeRepo implementation
+│   │       ├── mime_repo.go            # MimeRepo
-│   │       └── filter_parser.go        # DSL → SQL WHERE clause builder
+│   │       ├── duplicate_repo.go       # DuplicatePairRepo + DismissalRepo
+│   │       └── filter_parser.go        # Filter DSL → SQL WHERE clause builder
 │   │
 │   ├── storage/                        # File storage adapter
-│   │   └── disk.go                     # FileStorage implementation (read/write/delete on disk)
+│   │   └── disk.go                     # FileStorage on disk: originals + thumbnail/preview cache
+│   │                                   # (vipsthumbnail / ffmpeg / pure-Go imaging)
+│   │
+│   ├── imagehash/                      # Perceptual hashing (64-bit dHash) for near-duplicate detection
+│   │   └── imagehash.go
+│   │
+│   ├── integration/                    # End-to-end HTTP tests against a disposable Postgres
+│   │   └── server_test.go
 │   │
 │   └── config/                         # Configuration
-│       └── config.go                   # Struct + loader from env vars
+│       └── config.go                   # Config struct + loader from env vars
 │
-├── migrations/                         # SQL migration files (goose format)
+├── migrations/                         # SQL migration files (goose format), embedded via go:embed
 │   ├── 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
+│   ├── 007_seed_data.sql
+│   └── embed.go                        # //go:embed *.sql → migrations.FS
 │
 ├── go.mod
 └── go.sum
@@ -126,6 +153,7 @@ handler  →  service  →  port (interfaces)  ←  db/postgres / storage
 - **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.
+- **imagehash/**: leaf package (stdlib + image libs); used by service/ and storage/.
 
 No layer may import a layer above it. No circular dependencies.
 
@@ -133,104 +161,102 @@ No layer may import a layer above it. No circular dependencies.
 
 ### Dependency Injection (Wiring)
 
-Manual wiring in `cmd/server/main.go`. No DI frameworks.
+Manual wiring in `cmd/server/main.go`. No DI frameworks. Constructors take their
+collaborators explicitly; the shape below matches the real signatures.
 
 ```go
-// Pseudocode
+// Pseudocode — see cmd/server/main.go for the exact calls.
-pool := postgres.NewPool(cfg.DatabaseURL)
+pool := postgres.NewPool(ctx, cfg.DatabaseURL)
-goose.Up(pool, migrations)
+goose.Up(stdlib.OpenDBFromPool(pool), ".")   // migrations.FS embedded
+
+// Storage
+diskStorage := storage.NewDiskStorage(
+    cfg.FilesPath, cfg.ThumbsCachePath,
+    cfg.ThumbWidth, cfg.ThumbHeight, cfg.PreviewWidth, cfg.PreviewHeight,
+    cfg.ThumbMaxPixels, cfg.ThumbConcurrency,
+)
 
 // Repos (all from internal/db/postgres/)
 fileRepo := postgres.NewFileRepo(pool)
-tagRepo    := postgres.NewTagRepo(pool)
+// … tag, tagRule, category, pool, user, session, acl, audit, mime,
-// ...
+//    duplicatePair, dismissal repos + transactor
-
-// Storage
-diskStore  := storage.NewDiskStorage(cfg.FilesPath)
 
 // Services
-aclSvc     := service.NewACLService(aclRepo, objectTypeRepo)
+authSvc := service.NewAuthService(userRepo, sessionRepo,
-auditSvc   := service.NewAuditService(auditRepo, actionTypeRepo)
+    cfg.JWTSecret, cfg.JWTAccessTTL, cfg.JWTRefreshTTL, cfg.ContentTokenTTL)
-fileSvc    := service.NewFileService(fileRepo, mimeRepo, tagRepo, diskStore, aclSvc, auditSvc)
+aclSvc  := service.NewACLService(aclRepo, fileRepo, tagRepo, categoryRepo, poolRepo, transactor)
-tagSvc     := service.NewTagService(tagRepo, tagRuleRepo, aclSvc, auditSvc)
+auditSvc := service.NewAuditService(auditRepo)
-// ...
+tagSvc  := service.NewTagService(tagRepo, tagRuleRepo, aclSvc, auditSvc, transactor)
+dupSvc  := service.NewDuplicateService(fileRepo, duplicatePairRepo, dismissalRepo,
+    aclSvc, auditSvc, transactor, cfg.DuplicateHashThreshold)
+fileSvc := service.NewFileService(fileRepo, mimeRepo, diskStorage,
+    aclSvc, auditSvc, tagSvc, transactor, cfg.ImportPath)
+// … category, pool, user services
 
-// Handlers
+// Bootstrap the initial admin from env (idempotent).
-fileHandler := handler.NewFileHandler(fileSvc, tagSvc)
+userSvc.EnsureAdmin(ctx, cfg.AdminUsername, cfg.AdminPassword)
-// ...
 
-router := handler.NewRouter(cfg, fileHandler, tagHandler, ...)
+// Handlers → router (also wires trusted proxies + optional static SPA dir)
-router.Run(cfg.ListenAddr)
+router, _ := handler.NewRouter(authMiddleware, authHandler, fileHandler,
+    duplicateHandler, tagHandler, categoryHandler, poolHandler,
+    userHandler, aclHandler, auditHandler, cfg.StaticDir, cfg.TrustedProxies)
+srv.ListenAndServe()
 ```
 
 ### Context Propagation
 
 Every service method receives `context.Context` as the first argument.
-The handler extracts user info from JWT (via middleware) and puts it
+The auth middleware parses the JWT and puts the caller's identity (user id,
-into context. Services read the current user from context for ACL checks
+admin flag, session id) into the context. Services read it for ACL checks and
-and audit logging.
+audit logging.
 
 ```go
-// middleware.go
+// handler/middleware.go
-func (m *AuthMiddleware) Handle(c *gin.Context) {
+claims := parseJWT(c.GetHeader("Authorization"))
-    claims := parseJWT(c.GetHeader("Authorization"))
+ctx := domain.WithUser(c.Request.Context(), claims.UserID, claims.IsAdmin, claims.SessionID)
-    ctx := domain.WithUser(c.Request.Context(), claims.UserID, claims.IsAdmin)
+c.Request = c.Request.WithContext(ctx)
-    c.Request = c.Request.WithContext(ctx)
-    c.Next()
-}
 
 // domain/context.go
-type ctxKey int
+func WithUser(ctx context.Context, userID int16, isAdmin bool, sessionID int) context.Context
-const userKey ctxKey = iota
+func UserFromContext(ctx context.Context) (userID int16, isAdmin bool, sessionID int)
-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`:
+The `Transactor` port lets services compose multiple repo calls atomically.
+The postgres implementation stores the active `pgx.Tx` in the context; repo
+methods pick it up via a conn-or-tx helper, so the same method works inside or
+outside a transaction.
 
 ```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`,
+// service/file_service.go (sketch)
-all repo calls use the transaction from context. This allows services
+func (s *FileService) Upload(ctx context.Context, p UploadParams) (*domain.File, error) {
-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
+        created, err := s.files.Create(ctx, f)   // uses tx from ctx
-        if err != nil { return err }
+        // apply initial tags, etc., in the same tx
-        for _, tagID := range input.TagIDs {
+        return err
-            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
+ACL logic is centralized in `ACLService`. Other services call it before any
-any data mutation or retrieval:
+mutation or retrieval. The model is private-by-default: admins see everything;
+otherwise a `public` flag, creator ownership, or an explicit `acl.permissions`
+grant is required.
 
 ```go
-// service/acl_service.go
+// service/acl_service.go (shape)
-func (s *ACLService) CanView(ctx context.Context, objectType string, objectID uuid.UUID) error {
+func (s *ACLService) CanView(ctx context.Context, userID int16, isAdmin bool,
-    userID, isAdmin := domain.UserFromContext(ctx)
+    creatorID int16, isPublic bool, objectType int16, objectID uuid.UUID) (bool, error)
-    if isAdmin { return nil }
+func (s *ACLService) CanEdit(ctx context.Context, userID int16, isAdmin bool,
-    // Check is_public on the object
+    creatorID int16, objectType int16, objectID uuid.UUID) (bool, error)
-    // If not public, check creator_id == userID
-    // If not creator, check acl.permissions
-    // Return domain.ErrForbidden if none match
-}
 ```
 
 ### Error Mapping
@@ -238,7 +264,7 @@ func (s *ACLService) CanView(ctx context.Context, objectType string, objectID uu
 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     |
@@ -249,22 +275,12 @@ Domain errors → HTTP status codes (handled in handler/response.go):
 
 ### Filter DSL
 
-The DSL parser lives in `db/postgres/filter_parser.go` because it produces
+The DSL parser lives in `db/postgres/filter_parser.go` because it produces SQL
-SQL WHERE clauses — it is a PostgreSQL-specific adapter concern.
+WHERE clauses — a PostgreSQL-specific adapter concern. The service layer passes
-The service layer passes the raw DSL string to the repository; the
+the raw DSL string down; the repository parses it and builds the query. For a
-repository parses it and builds the query.
+different DBMS, a corresponding parser would live in `db/<dbms>/filter_parser.go`.
 
-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
@@ -279,6 +295,9 @@ type FileListParams struct {
 }
 ```
 
+The DSL grammar itself is documented in `openapi.yaml` (the `filter` query
+parameter), so the contract stays in one place.
+
 ### JWT Structure
 
 ```go
@@ -290,31 +309,24 @@ type Claims struct {
 }
 ```
 
-Access token: short-lived (15 min). Refresh token: long-lived (30 days),
+Access token: short-lived (15 min default). Refresh token: long-lived (30 days
-stored as hash in `activity.sessions.token_hash`.
+default), rotated on use, stored as a hash in `activity.sessions`. A separate
+**content token** (default 6 h) is a single-file capability minted for media
+URLs, so a long video keeps streaming past access-token expiry — see
+`CONTENT_TOKEN_TTL` in `.env.example`.
+
+### Perceptual Duplicate Detection
+
+Images are dHash-ed inline on upload (`internal/imagehash`); video hashes are
+backfilled by the `dedup` CLI (ffmpeg stays off the upload path). A rescan
+rebuilds `data.duplicate_pairs` by inserting every pair within
+`DUPLICATE_HASH_THRESHOLD` Hamming distance (BK-tree lookups, not O(N²)); the
+duplicates API then groups pairs into connected-component clusters. See
+`service/duplicate_service.go` and `service/duplicate_index.go`.
 
 ### Configuration (.env)
 
-```env
+Every variable the server reads is documented in `.env.example` (1:1 with
-# Server
+`config.Config`). Required at startup: `JWT_SECRET`, `ADMIN_PASSWORD`,
-LISTEN_ADDR=:42776
+`DATABASE_URL`, `FILES_PATH`, `THUMBS_CACHE_PATH`, `IMPORT_PATH`. Everything
-JWT_SECRET=<random-32-bytes>
+else has a sensible default (see `config.go`).
-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
-```

docs/REQUIREMENTS.md

@@ -0,0 +1,179 @@
+# Tanabata File Manager — Requirements
+
+> Product requirements for Tanabata File Manager (TFM). Architecture and code
+> layout are described separately in [ARCHITECTURE.md](ARCHITECTURE.md),
+> [GO_PROJECT_STRUCTURE.md](GO_PROJECT_STRUCTURE.md) and
+> [FRONTEND_STRUCTURE.md](FRONTEND_STRUCTURE.md).
+
+## Overview
+
+Tanabata File Manager (TFM) is a multi-user, tag-based web file manager. It runs
+on a client–server architecture and is operated entirely through a web
+interface. Its goal is centralized, server-side storage of files with access and
+management from both desktop and mobile browsers. The application is primarily
+oriented toward **images and video**.
+
+The app is a PWA that can be installed on a desktop or a phone. Files managed by
+Tanabata are stored flat in a single directory; each file's on-disk name equals
+its UUID in the database.
+
+Support for additional database engines is planned for future versions.
+
+## Core Concepts
+
+- **File** — a single file on the server. It may carry any number of tags and
+  belong to any number of pools. It has a creator and optional access settings
+  (a user — which may be null, making the file public — plus read and edit
+  permission flags). It has an original name and metadata (key–value, including
+  all EXIF data).
+- **Tag** — a label on a file. It may be attached to any number of files and
+  belong to at most one category. It has a name, a description, key–value
+  metadata, and may define auto-tag rules.
+- **Auto-tag (tag rule)** — a rule stating that when tag A is attached to a file,
+  tag B is attached to the same file automatically.
+- **Category** — an entity that logically groups several tags. It has a name, a
+  description, and key–value metadata.
+- **Pool** — a logical grouping of files. It has a name, a description, and
+  key–value metadata. Files in a pool can be sorted automatically or arranged in
+  a user-defined manual order.
+
+## Functional Requirements
+
+### 1. File management
+
+1. Browse the file list (lazy load, pagination).
+2. Filter files by tags and metadata.
+3. View and edit sort settings (persisted per user).
+4. Multi-select files (Ctrl, Shift) and act on the selection:
+   1. Attach / detach tags.
+   2. Copy / paste tags.
+   3. Add to a pool.
+   4. View and edit access settings.
+   5. Delete (with a confirmation prompt).
+5. View a single file.
+6. Single-file actions:
+   1. Attach / detach tags.
+   2. Copy / paste tags.
+   3. Add to a pool.
+   4. View and edit access settings.
+   5. Replace the file (upload new content under the same ID).
+   6. Delete (with a confirmation prompt).
+7. Browse files gallery-style (prev/next paging through the viewer).
+8. Upload new files through the web UI (form or drag-and-drop onto the list).
+9. Import new files from a folder on the server.
+10. Near-duplicate detection for images and video:
+    1. Show groups (clusters) of duplicates.
+    2. Dismiss false duplicates (the app remembers that file A is _not_ a
+       duplicate of file B).
+    3. Choose which duplicate to keep and which to delete.
+    4. Choose, per field, which duplicate the surviving file inherits it from.
+11. Trash:
+    1. Browse trashed files.
+    2. Restore from trash.
+    3. Delete permanently.
+
+### 2. Tag management
+
+1. Browse the tag list (lazy load, pagination).
+2. Search by name.
+3. View and edit sort settings (persisted per user).
+4. Multi-select tags (Ctrl, Shift) and act on the selection:
+   1. Assign auto-tag rules.
+   2. Change category.
+   3. Delete (with a confirmation prompt).
+5. View a single tag.
+6. Single-tag actions:
+   1. Edit name, description, and metadata (key–value).
+   2. Change category.
+   3. Assign auto-tag rules.
+   4. Delete (with a confirmation prompt).
+7. Create a tag:
+   1. Enter name, description, and metadata (key–value).
+   2. Assign a category (optional).
+   3. Assign auto-tag rules.
+
+### 3. Category management
+
+1. Browse the category list (lazy load, pagination).
+2. Search by name.
+3. View and edit sort settings (persisted per user).
+4. Multi-select categories (Ctrl, Shift) and act on the selection:
+   1. View shared tags and tags attached to some (but not all) of them.
+   2. Attach / detach tags.
+   3. Delete (with a confirmation prompt).
+5. View a single category.
+6. Single-category actions:
+   1. Edit name, description, and metadata (key–value).
+   2. View attached tags.
+   3. Attach / detach tags.
+   4. Delete (with a confirmation prompt).
+7. Create a category:
+   1. Enter name, description, and metadata (key–value).
+   2. Attach tags.
+
+### 4. Pool management
+
+1. Browse the pool list (lazy load, pagination).
+2. Search by name.
+3. View and edit sort settings (persisted per user).
+4. Multi-select pools (Ctrl, Shift) and act on the selection:
+   1. View and edit access settings.
+   2. Delete (with a confirmation prompt).
+5. View a single pool.
+6. Single-pool actions:
+   1. Edit name, description, and metadata (key–value).
+   2. View and edit access settings.
+   3. View all files in the pool.
+   4. Filter the pool's files by tags.
+   5. Change the file sort setting (including disabling automatic sorting).
+   6. Reorder files manually (when automatic sorting is disabled).
+   7. Delete (with a confirmation prompt).
+7. Create a pool:
+   1. Enter name, description, and metadata (key–value).
+   2. Attach files.
+
+### 5. User settings
+
+1. Username.
+2. Password.
+3. Sessions:
+   1. Terminate a session.
+4. Path to the server folder scanned during file import.
+
+### 6. Server administration (admin panel)
+
+1. Users:
+   1. Browse the list.
+   2. View a single user.
+   3. Create.
+   4. Delete.
+   5. Block / unblock.
+   6. Set role (reader / editor).
+
+### 7. Audit logging (in the database)
+
+Log the following user actions:
+
+1. File views.
+2. Changes to file access settings.
+3. Create / edit / delete of a file, tag, category, pool, or file–tag relation.
+4. Create / block / unblock / delete of a user.
+5. User role changes.
+6. User login / logout.
+7. Session termination.
+
+## Non-Functional Requirements
+
+1. The interface must be as simple and convenient as possible: everything needed
+   should be at hand, reachable in the fewest possible actions.
+2. The interface must adapt to both desktop and mobile devices.
+3. The interface must offer dark and light themes.
+4. Use PWA technology, including a button that fully resets the PWA (except the
+   cache) and reloads it from the server.
+5. Allow selected files to be cached and viewed offline in the installed PWA.
+6. First-run setup must require minimal effort: automatic database migration, a
+   ready-made Docker Compose file, and a `.env` file with the configurable
+   installation parameters.
+7. Use a Domain-Driven Design approach on the API server.
+8. Reject files whose MIME type is not present in the database (no DB entry — no
+   support).

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))

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)
-}

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)
-}

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
-}

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
-}

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
-)

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=

docs/reference/backend/internal/domain/domain.go

@@ -1,122 +0,0 @@
-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"`
-}

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
-}

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
-}

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
-}

docs/reference/backend/internal/storage/postgres/utils.go

@@ -1,53 +0,0 @@
-package postgres
-
-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
-}

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)
-}

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"`
-}

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;
-}

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 {
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docs/reference/web/static/images/icon-tag.svg

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docs/reference/web/static/images/icon-terminate.svg

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