fix: address code review findings

internal/musicbrainz/sync.go

@@ -59,10 +59,10 @@ func SyncArtistDiscography(
 		}
 		filtered := make([]database.ExternalRelease, 0, len(cachedReleases))
 		for _, r := range cachedReleases {
-			if opts.IgnoreSingles && r.Type == "Single" {
+			if opts.IgnoreSingles && (r.Type == "Single" || hasSliceType(r.SecondaryTypes, "Single")) {
 				continue
 			}
-			if opts.IgnoreCompilations && r.Type == "Compilation" {
+			if opts.IgnoreCompilations && (r.Type == "Compilation" || hasSliceType(r.SecondaryTypes, "Compilation")) {
 				continue
 			}
 			filtered = append(filtered, r)
@@ -152,6 +152,18 @@ func SyncArtistDiscography(
 	return releases, nil
 }
 
+// hasSliceType reports whether the slice contains the wanted value. It mirrors
+// hasSecondaryType in api.go but operates on the persisted []string form read
+// back from external_releases (cache-hit path).
+func hasSliceType(types []string, wanted string) bool {
+	for _, t := range types {
+		if t == wanted {
+			return true
+		}
+	}
+	return false
+}
+
 // getArtistFilterOptions reads per-artist type filtering preferences.
 // Defaults to no filtering if artist_settings row doesn't exist.
 // artistID is the Navidrome artist ID (artist_settings.id), not the MusicBrainz ID.