step 2: Add UUID columns with backfill and dual-write support

- Add migration 000007: Add UUID columns to soundtrack and song with backfill
- Update InsertSoundtrack and InsertSoundtrackWithExistingId to accept UUID
- Update AddSong to accept UUID
- Add dual-write: Go code now generates UUIDs for new records
- Add uuid and pgtype imports

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

internal/db/repository/models.go

@@ -10,14 +10,6 @@ import (
 	"github.com/jackc/pgx/v5/pgtype"
 )
 
-type IDMigrationStatus struct {
-	TableName    string     `json:"table_name"`
-	TotalRows    int32      `json:"total_rows"`
-	MigratedRows int32      `json:"migrated_rows"`
-	Completed    bool       `json:"completed"`
-	StartedAt    *time.Time `json:"started_at"`
-}
-
 type Session struct {
 	Token      string             `json:"token"`
 	IpAddress  string             `json:"ip_address"`

internal/db/repository/song.sql.go

@@ -27,19 +27,21 @@ func (q *Queries) AddHashToSong(ctx context.Context, arg AddHashToSongParams) er
 }
 
 const addSong = `-- name: AddSong :exec
-INSERT INTO song(soundtrack_id, song_name, path, file_name, hash) VALUES ($1, $2, $3, $4, $5)
+INSERT INTO song(uuid, soundtrack_id, song_name, path, file_name, hash) VALUES ($1, $2, $3, $4, $5, $6)
 `
 
 type AddSongParams struct {
-	SoundtrackID int32   `json:"soundtrack_id"`
-	SongName     string  `json:"song_name"`
-	Path         string  `json:"path"`
-	FileName     *string `json:"file_name"`
-	Hash         string  `json:"hash"`
+	Uuid         pgtype.UUID `json:"uuid"`
+	SoundtrackID int32       `json:"soundtrack_id"`
+	SongName     string      `json:"song_name"`
+	Path         string      `json:"path"`
+	FileName     *string     `json:"file_name"`
+	Hash         string      `json:"hash"`
 }
 
 func (q *Queries) AddSong(ctx context.Context, arg AddSongParams) error {
 	_, err := q.db.Exec(ctx, addSong,
+		arg.Uuid,
 		arg.SoundtrackID,
 		arg.SongName,
 		arg.Path,

internal/db/repository/soundtrack.sql.go

@@ -7,6 +7,8 @@ package repository
 
 import (
 	"context"
+
+	"github.com/jackc/pgx/v5/pgtype"
 )
 
 const addSoundtrackPlayed = `-- name: AddSoundtrackPlayed :exec
@@ -153,36 +155,44 @@ func (q *Queries) GetSoundtrackNameById(ctx context.Context, id int32) (string,
 }
 
 const insertSoundtrack = `-- name: InsertSoundtrack :one
-INSERT INTO soundtrack (soundtrack_name, path, hash, added) VALUES ($1, $2, $3, now()) returning id
+INSERT INTO soundtrack (uuid, soundtrack_name, path, hash, added) VALUES ($1, $2, $3, $4, now()) returning id
 `
 
 type InsertSoundtrackParams struct {
-	SoundtrackName string `json:"soundtrack_name"`
-	Path           string `json:"path"`
-	Hash           string `json:"hash"`
+	Uuid           pgtype.UUID `json:"uuid"`
+	SoundtrackName string      `json:"soundtrack_name"`
+	Path           string      `json:"path"`
+	Hash           string      `json:"hash"`
 }
 
 func (q *Queries) InsertSoundtrack(ctx context.Context, arg InsertSoundtrackParams) (int32, error) {
-	row := q.db.QueryRow(ctx, insertSoundtrack, arg.SoundtrackName, arg.Path, arg.Hash)
+	row := q.db.QueryRow(ctx, insertSoundtrack,
+		arg.Uuid,
+		arg.SoundtrackName,
+		arg.Path,
+		arg.Hash,
+	)
 	var id int32
 	err := row.Scan(&id)
 	return id, err
 }
 
 const insertSoundtrackWithExistingId = `-- name: InsertSoundtrackWithExistingId :exec
-INSERT INTO soundtrack (id, soundtrack_name, path, hash, added) VALUES ($1, $2, $3, $4, now())
+INSERT INTO soundtrack (id, uuid, soundtrack_name, path, hash, added) VALUES ($1, $2, $3, $4, $5, now())
 `
 
 type InsertSoundtrackWithExistingIdParams struct {
-	ID             int32  `json:"id"`
-	SoundtrackName string `json:"soundtrack_name"`
-	Path           string `json:"path"`
-	Hash           string `json:"hash"`
+	ID             int32       `json:"id"`
+	Uuid           pgtype.UUID `json:"uuid"`
+	SoundtrackName string      `json:"soundtrack_name"`
+	Path           string      `json:"path"`
+	Hash           string      `json:"hash"`
 }
 
 func (q *Queries) InsertSoundtrackWithExistingId(ctx context.Context, arg InsertSoundtrackWithExistingIdParams) error {
 	_, err := q.db.Exec(ctx, insertSoundtrackWithExistingId,
 		arg.ID,
+		arg.Uuid,
 		arg.SoundtrackName,
 		arg.Path,
 		arg.Hash,