fix: address code review findings

internal/musicbrainz/sync_test.go

@@ -846,7 +846,7 @@ func TestSyncArtistDiscography_CacheHit_IgnoreSecondaryCompilation(t *testing.T)
 	}
 
 	// Seed a cached release: primary "Album" + secondary "Compilation".
-	// cached_at is set far in the past so it is still within any TTL (TTL 0).
+	// cached_at is set to the recent past so it is well within the 24h TTL.
 	if err := database.SaveExternalRelease(db, &database.ExternalRelease{
 		RGID:           "rg-comp",
 		ArtistID:       artistID,
@@ -854,7 +854,7 @@ func TestSyncArtistDiscography_CacheHit_IgnoreSecondaryCompilation(t *testing.T)
 		Type:           "Album",
 		SecondaryTypes: []string{"Compilation"},
 		IsIgnored:      false,
-		CachedAt:       time.Now().UTC(),
+		CachedAt:       time.Now().UTC().Add(-time.Hour),
 	}); err != nil {
 		t.Fatalf("seed cached release: %v", err)
 	}
@@ -863,7 +863,7 @@ func TestSyncArtistDiscography_CacheHit_IgnoreSecondaryCompilation(t *testing.T)
 	client := newTestClient("http://unused.invalid")
 	ctx := context.Background()
 
-	releases, err := SyncArtistDiscography(ctx, client, db, artistID, "mbid-unused", 0)
+	releases, err := SyncArtistDiscography(ctx, client, db, artistID, "mbid-unused", 24*time.Hour)
 	if err != nil {
 		t.Fatalf("SyncArtistDiscography() error: %v", err)
 	}