fix: address code review findings

internal/database/database_test.go

@@ -205,8 +205,9 @@ func TestMigrationTracking(t *testing.T) {
 		t.Fatalf("query migrations count: %v", err)
 	}
 
-	// We have 5 recorded migrations: artist_settings, external_releases, local_albums, notifications_sent, cached_at column.
-	if count != 5 {
-		t.Errorf("expected 5 applied migrations, got %d", count)
+	// We have 6 recorded migrations: artist_settings, external_releases,
+	// local_albums, notifications_sent, cached_at column, secondary_types column.
+	if count != 6 {
+		t.Errorf("expected 6 applied migrations, got %d", count)
 	}
 }