fix(db/m7-352): cast COALESCE to uuid so sqlc emits typed return

internal/db/dbq/system_playlists.sql.go

@@ -290,7 +290,7 @@ SELECT COALESCE(
                t.track_number NULLS LAST,
                t.id
       LIMIT 1)
-)
+)::uuid AS id
 `
 
 type PickTopPlayedTrackForArtistByUserParams struct {
@@ -301,11 +301,12 @@ type PickTopPlayedTrackForArtistByUserParams struct {
 // "Songs like X" seed selection. Returns the user's most-played non-skipped
 // track by artist X in the last 7 days. Falls back to the artist's most-
 // recent album's first track if no plays exist.
-func (q *Queries) PickTopPlayedTrackForArtistByUser(ctx context.Context, arg PickTopPlayedTrackForArtistByUserParams) (interface{}, error) {
+// Cast to uuid so sqlc infers pgtype.UUID rather than interface{}.
+func (q *Queries) PickTopPlayedTrackForArtistByUser(ctx context.Context, arg PickTopPlayedTrackForArtistByUserParams) (pgtype.UUID, error) {
 	row := q.db.QueryRow(ctx, pickTopPlayedTrackForArtistByUser, arg.UserID, arg.ArtistID)
-	var coalesce interface{}
+	var id pgtype.UUID
-	err := row.Scan(&coalesce)
+	err := row.Scan(&id)
-	return coalesce, err
+	return id, err
 }
 
 const pickTopPlayedTrackForUser = `-- name: PickTopPlayedTrackForUser :one

internal/db/queries/system_playlists.sql

@@ -86,6 +86,7 @@ SELECT t.id
 -- "Songs like X" seed selection. Returns the user's most-played non-skipped
 -- track by artist X in the last 7 days. Falls back to the artist's most-
 -- recent album's first track if no plays exist.
+-- Cast to uuid so sqlc infers pgtype.UUID rather than interface{}.
 SELECT COALESCE(
     (SELECT t.id
        FROM play_events pe
@@ -106,7 +107,7 @@ SELECT COALESCE(
                t.track_number NULLS LAST,
                t.id
       LIMIT 1)
-);
+)::uuid AS id;
 
 -- name: PickTopAlbumCoverForArtistByUser :one
 -- "Songs like X" cover. Most-played album by user; tie-break by most-recent