feat: raise discography limit to 500 and paginate Discogs artist releases

Raise the album fetch limit from 50 to 500 across all three call sites
(artist-detail page, discography download modal, source-detail view).
Deezer/iTunes/Spotify already paginate internally; Discogs previously
fetched a single page capped at 200 raw rows.

Discogs is updated to paginate all pages (100 per request, Discogs max)
before filtering, so the limit applies to qualified albums rather than
raw API rows. The early-exit guard respects limit=0 as unlimited.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

core/artist_source_detail.py

@@ -126,7 +126,7 @@ def build_source_only_artist_detail(
             allow_fallback=True,
             skip_cache=False,
             max_pages=0,
-            limit=50,
+            limit=500,
             artist_source_ids={source: artist_id},
             dedup_variants=False,
         ),

core/discogs_client.py

@@ -656,16 +656,32 @@ class DiscogsClient:
 
         return result
 
-    def get_artist_albums(self, artist_id: str, album_type: str = 'album,single', limit: int = 50) -> List[Album]:
+    def get_artist_albums(self, artist_id: str, album_type: str = 'album,single', limit: int = 500) -> List[Album]:
         """Get releases by an artist. Prefers master releases, filters features."""
         # First get the artist name for feature filtering
         artist_data = self._api_get(f'/artists/{artist_id}')
         artist_name = artist_data.get('name', '').lower() if artist_data else ''
 
-        data = self._api_get(f'/artists/{artist_id}/releases', {
-            'sort': 'year', 'sort_order': 'desc', 'per_page': min(limit * 3, 200),
-        })
-        if not data or not data.get('releases'):
+        # Paginate through all release pages (Discogs max per_page=100).
+        # Collect everything before filtering so the limit applies to
+        # qualified albums, not raw API rows.
+        PAGE_SIZE = 100
+        all_items: list = []
+        page = 1
+        while True:
+            data = self._api_get(f'/artists/{artist_id}/releases', {
+                'sort': 'year', 'sort_order': 'desc',
+                'per_page': PAGE_SIZE, 'page': page,
+            })
+            if not data or not data.get('releases'):
+                break
+            all_items.extend(data['releases'])
+            pagination = data.get('pagination', {})
+            if page >= pagination.get('pages', 1):
+                break
+            page += 1
+
+        if not all_items:
             return []
 
         # Separate masters from individual releases — prefer masters (canonical versions)
@@ -673,7 +689,7 @@ class DiscogsClient:
         releases_no_master = []
         master_titles = set()
 
-        for item in data['releases']:
+        for item in all_items:
             # Skip non-main roles
             role = item.get('role', 'Main').lower()
             if role not in ('main', ''):
@@ -726,7 +742,7 @@ class DiscogsClient:
                 if album.album_type in allowed_types:
                     albums.append(album)
 
-                if len(albums) >= limit:
+                if limit and len(albums) >= limit:
                     break
             except Exception as e:
                 logger.debug(f"Error parsing Discogs artist release: {e}")

web_server.py

@@ -8662,7 +8662,7 @@ def get_artist_detail(artist_id):
                     allow_fallback=True,
                     skip_cache=False,
                     max_pages=0,
-                    limit=50,
+                    limit=500,
                     artist_source_ids=artist_source_ids,
                 ),
             )
@@ -9046,7 +9046,7 @@ def get_artist_discography(artist_id):
                 allow_fallback=True,
                 skip_cache=False,
                 max_pages=0,
-                limit=50,
+                limit=500,
                 artist_source_ids=artist_source_ids or None,
             ),
         )