fix: address code review findings

internal/musicbrainz/sync.go

@@ -44,12 +44,30 @@ func SyncArtistDiscography(
 		return nil, fmt.Errorf("sync artist discography: cache check failed: %w", err)
 	}
 
-	// Step 2: If we have cached data, return it.
+	// Step 2: If we have cached data, return it. Re-apply the per-artist type
+	// toggles even on a cache hit so user changes to ignore_singles /
+	// ignore_compilations take effect without waiting for cache expiry.
+	// (Status/type inclusion was already applied when the rows were first
+	// synced and stored, so only the toggles can change.)
 	if len(cachedReleases) > 0 {
 		if err := ctx.Err(); err != nil {
 			return nil, fmt.Errorf("sync artist discography: %w", err)
 		}
-		return cachedReleases, nil
+		opts, err := getArtistFilterOptions(db, artistID)
+		if err != nil {
+			return nil, fmt.Errorf("sync artist discography: read artist filter options: %w", err)
+		}
+		filtered := cachedReleases[:0]
+		for _, r := range cachedReleases {
+			if opts.IgnoreSingles && r.Type == "Single" {
+				continue
+			}
+			if opts.IgnoreCompilations && r.Type == "Compilation" {
+				continue
+			}
+			filtered = append(filtered, r)
+		}
+		return filtered, nil
 	}
 
 	// Step 3: Cache miss — fetch from MusicBrainz API.
@@ -137,11 +155,12 @@ func SyncArtistDiscography(
 
 // getArtistFilterOptions reads per-artist type filtering preferences.
 // Defaults to no filtering if artist_settings row doesn't exist.
-func getArtistFilterOptions(db *database.DB, artistMBID string) (FilterOptions, error) {
+// artistID is the Navidrome artist ID (artist_settings.id), not the MusicBrainz ID.
+func getArtistFilterOptions(db *database.DB, artistID string) (FilterOptions, error) {
 	var opts FilterOptions
 	err := db.Conn().QueryRow(
 		"SELECT COALESCE(ignore_singles, 0), COALESCE(ignore_compilations, 0) FROM artist_settings WHERE id = ?",
-		artistMBID,
+		artistID,
 	).Scan(&opts.IgnoreSingles, &opts.IgnoreCompilations)
 	if err == sql.ErrNoRows {
 		return opts, nil

internal/normalize/normalize.go

@@ -37,8 +37,13 @@ func NormalizeString(s string) string {
 	// Remove parenthesized content (e.g., (Deluxe), (Remastered))
 	s = parenRe.ReplaceAllString(s, "")
 
-	// Remove years (4-digit numbers between 1000-2999)
+	// Remove years (4-digit numbers between 1000-2999). If stripping the
-	s = yearRe.ReplaceAllString(s, "")
+	// year would empty the entire string (e.g. an album literally titled
+	// "1989" or "2112"), keep the original form so the title can still match.
+	stripped := yearRe.ReplaceAllString(s, "")
+	if strings.TrimSpace(stripped) != "" {
+		s = stripped
+	}
 
 	// Replace common separators with spaces before stripping other special chars
 	s = strings.ReplaceAll(s, "-", " ")

internal/normalize/normalize_test.go

@@ -36,6 +36,9 @@ func TestNormalizeString_Basic(t *testing.T) {
 		// Digits that are not years should stay
 		{"30 Seconds to Mars", "30 seconds to mars"},
 		{"1941 - The Greatest Hits", "the greatest hits"},
+		// Year-only title is preserved (not collapsed to empty) so it can still match
+		{"1989", "1989"},
+		{"2112", "2112"},
 	}
 
 	for _, tt := range tests {