fix: address code review findings

internal/musicbrainz/sync.go

@@ -39,7 +39,7 @@ func SyncArtistDiscography(
 	}
 
 	// Step 1: Check cache.
-	cachedReleases, err := GetCachedReleases(db, artistID, ttl)
+	cachedReleases, err := database.GetExternalReleasesByArtistWithCache(db, artistID, ttl)
 	if err != nil {
 		return nil, fmt.Errorf("sync artist discography: cache check failed: %w", err)
 	}