Clarify similar-artist freshness and backfill

Freshness is now age-only, and scan-time backfill runs separately without Spotify-auth gating or retired iTunes compatibility flags.

core/watchlist_scanner.py

@@ -1255,8 +1255,7 @@ class WatchlistScanner:
                     if scan_state is not None:
                         scan_state['current_phase'] = 'fetching_similar_artists'
                     artist_profile_id = getattr(artist, 'profile_id', profile_id)
-                    spotify_authenticated = self.spotify_client and self.spotify_client.is_spotify_authenticated()
-                    if self.database.has_fresh_similar_artists(source_artist_id, days_threshold=30, require_spotify=spotify_authenticated, profile_id=artist_profile_id):
+                    if self.database.has_fresh_similar_artists(source_artist_id, days_threshold=30, profile_id=artist_profile_id):
                         logger.info("Similar artists for %s are cached and fresh (profile %s)", artist.artist_name, artist_profile_id)
                         self._backfill_similar_artists_fallback_ids(source_artist_id, profile_id=artist_profile_id)
                     else:
@@ -2325,10 +2324,6 @@ class WatchlistScanner:
             logger.error("Error backfilling similar artists IDs: %s", e)
             return 0
 
-    def _backfill_similar_artists_itunes_ids(self, source_artist_id: str, profile_id: int = 1) -> int:
-        """Backward-compatible alias for the provider-priority backfill path."""
-        return self._backfill_similar_artists_fallback_ids(source_artist_id, profile_id=profile_id)
-
     def update_similar_artists(
         self,
         watchlist_artist: WatchlistArtist,
@@ -3631,8 +3626,8 @@ class WatchlistScanner:
                     except Exception as e:
                         logger.debug(f"Error building BYLT for {played_artist.get('name', '?')}: {e}")
 
-            # Also save without suffix for backward compatibility (use active source)
-            active_source = 'spotify' if spotify_available else fallback_source
+            # Also save without suffix for backward compatibility (use first active source).
+            active_source = sources_to_process[0]
             release_radar_key = f'release_radar_{active_source}'
             discovery_weekly_key = f'discovery_weekly_{active_source}'
 

database/music_database.py

@@ -7473,19 +7473,16 @@ class MusicDatabase:
             logger.error(f"Error updating similar artist metadata by external ID: {e}")
             return False
 
-    def has_fresh_similar_artists(self, source_artist_id: str, days_threshold: int = 30, require_itunes: bool = True, require_spotify: bool = False, profile_id: int = 1) -> bool:
+    def has_fresh_similar_artists(self, source_artist_id: str, days_threshold: int = 30, profile_id: int = 1) -> bool:
         """
         Check if we have cached similar artists that are still fresh (<days_threshold old).
-        Also checks that similar artists have the required provider IDs.
 
         Args:
             source_artist_id: The source artist ID to check
             days_threshold: Maximum age in days to consider fresh
-            require_itunes: If True, also requires iTunes IDs to be present (for seamless provider switching)
-            require_spotify: If True, also requires Spotify IDs to be present (for Spotify discovery)
             profile_id: Profile to check freshness for
 
-        Returns True if we have recent data with required IDs, False if data is stale, missing, or incomplete.
+        Returns True if we have recent data, False if data is stale or missing.
         """
         try:
             with self._get_connection() as conn:
@@ -7510,40 +7507,6 @@ class MusicDatabase:
                 if days_since_update >= days_threshold:
                     return False
 
-                # Check if we have iTunes IDs (for seamless provider switching)
-                if require_itunes:
-                    cursor.execute("""
-                        SELECT COUNT(*) as total,
-                               SUM(CASE WHEN similar_artist_itunes_id IS NOT NULL AND similar_artist_itunes_id != '' THEN 1 ELSE 0 END) as has_itunes
-                        FROM similar_artists
-                        WHERE source_artist_id = ? AND profile_id = ?
-                    """, (source_artist_id, profile_id))
-                    id_row = cursor.fetchone()
-
-                    if id_row and id_row['total'] > 0:
-                        # If less than 50% have iTunes IDs, consider stale and refetch
-                        itunes_ratio = id_row['has_itunes'] / id_row['total']
-                        if itunes_ratio < 0.5:
-                            logger.debug(f"Similar artists for {source_artist_id} missing iTunes IDs ({id_row['has_itunes']}/{id_row['total']}), will refetch")
-                            return False
-
-                # Check if we have Spotify IDs (for Spotify discovery)
-                if require_spotify:
-                    cursor.execute("""
-                        SELECT COUNT(*) as total,
-                               SUM(CASE WHEN similar_artist_spotify_id IS NOT NULL AND similar_artist_spotify_id != '' THEN 1 ELSE 0 END) as has_spotify
-                        FROM similar_artists
-                        WHERE source_artist_id = ? AND profile_id = ?
-                    """, (source_artist_id, profile_id))
-                    id_row = cursor.fetchone()
-
-                    if id_row and id_row['total'] > 0:
-                        # If less than 50% have Spotify IDs, consider stale and refetch
-                        spotify_ratio = id_row['has_spotify'] / id_row['total']
-                        if spotify_ratio < 0.5:
-                            logger.debug(f"Similar artists for {source_artist_id} missing Spotify IDs ({id_row['has_spotify']}/{id_row['total']}), will refetch")
-                            return False
-
                 return True
 
         except Exception as e:

tests/test_watchlist_scanner_scan.py

@@ -1105,6 +1105,29 @@ def test_curate_discovery_playlists_uses_source_priority_for_recent_albums(monke
     assert any(key == "discovery_weekly_deezer" for key, _ in saved_playlists)
 
 
+def test_has_fresh_similar_artists_uses_age_only(tmp_path):
+    from datetime import datetime
+    from database.music_database import MusicDatabase
+
+    db = MusicDatabase(str(tmp_path / "music.db"))
+    db.add_or_update_similar_artist(
+        source_artist_id="source-1",
+        similar_artist_name="Similar Artist",
+        similar_artist_itunes_id="it-artist",
+        similar_artist_deezer_id="dz-artist",
+        profile_id=1,
+    )
+
+    with db._get_connection() as conn:
+        conn.execute(
+            "UPDATE similar_artists SET last_updated = ? WHERE source_artist_id = ? AND profile_id = ?",
+            (datetime.now().isoformat(), "source-1", 1),
+        )
+        conn.commit()
+
+    assert db.has_fresh_similar_artists("source-1", days_threshold=30, profile_id=1) is True
+
+
 def test_match_to_spotify_uses_strict_lookup():
     spotify_client = _FakeSpotifyClient(
         search_results=[types.SimpleNamespace(id="fallback-id", name="Artist One")]