fix(backend/domain): fix typo in error code

backend/internal/domain/entity.go

@@ -3,8 +3,6 @@ package domain
 import (
 	"encoding/json"
 	"time"
-
-	"github.com/jackc/pgx/v5/pgtype"
 )
 
 type User struct {
@@ -31,14 +29,14 @@ type (
 		CategoryCore
 		CreatedAt time.Time `json:"createdAt"`
 		Creator   User      `json:"creator"`
-		Notes     pgtype.Text `json:"notes"`
+		Notes     *string   `json:"notes"`
 	}
 )
 
 type (
 	FileCore struct {
 		ID   string  `json:"id"`
-		Name pgtype.Text `json:"name"`
+		Name *string `json:"name"`
 		MIME MIME    `json:"mime"`
 	}
 	FileItem struct {
@@ -50,7 +48,7 @@ type (
 		FileCore
 		CreatedAt time.Time       `json:"createdAt"`
 		Creator   User            `json:"creator"`
-		Notes     pgtype.Text     `json:"notes"`
+		Notes     *string         `json:"notes"`
 		Metadata  json.RawMessage `json:"metadata"`
 		Viewed    int             `json:"viewed"`
 	}
@@ -60,7 +58,7 @@ type (
 	TagCore struct {
 		ID    string  `json:"id"`
 		Name  string  `json:"name"`
-		Color pgtype.Text `json:"color"`
+		Color *string `json:"color"`
 	}
 	TagItem struct {
 		TagCore
@@ -71,7 +69,7 @@ type (
 		Category  CategoryCore `json:"category"`
 		CreatedAt time.Time    `json:"createdAt"`
 		Creator   User         `json:"creator"`
-		Notes     pgtype.Text  `json:"notes"`
+		Notes     *string      `json:"notes"`
 		UsedIncl  int          `json:"usedIncl"`
 		UsedExcl  int          `json:"usedExcl"`
 	}
@@ -95,7 +93,7 @@ type (
 		PoolCore
 		CreatedAt time.Time `json:"createdAt"`
 		Creator   User      `json:"creator"`
-		Notes     pgtype.Text `json:"notes"`
+		Notes     *string   `json:"notes"`
 		Viewed    int       `json:"viewed"`
 	}
 )

backend/internal/domain/errors.go

@@ -5,7 +5,7 @@ type ErrorCode string
 const (
 	// File errors
 	ErrFileNotFound     ErrorCode = "FILE_NOT_FOUND"
-	ErrMIMENotSupported ErrorCode = "MIME_NOT_SUPPORTEDF"
+	ErrMIMENotSupported ErrorCode = "MIME_NOT_SUPPORTED"
 
 	// Tag errors
 	ErrTagNotFound ErrorCode = "TAG_NOT_FOUND"

backend/internal/infrastructure/persistence/postgres/file_repository.go

@@ -198,8 +198,7 @@ func (s *FileRepository) Add(ctx context.Context, user_id int, name, mime string
 		domainErr = domain.NewUnexpectedError(err)
 		return
 	}
-	file.Name.String = name
-	file.Name.Valid = (name != "")
+	file.Name = &name
 	file.MIME.Name = mime
 	file.MIME.Extension = extension
 	return