feat(provenance): ArtistService resolves images via artist_id

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/app/services/artist_service.py

@@ -47,18 +47,12 @@ class ArtistService:
         aid = artist.id
 
         img_join = (
-            select(ImageRecord.id)
-            .join(ImageProvenance, ImageProvenance.image_record_id == ImageRecord.id)
-            .join(Source, Source.id == ImageProvenance.source_id)
-            .where(Source.artist_id == aid)
+            select(ImageRecord.id).where(ImageRecord.artist_id == aid)
         )
         image_count = (
             await self.session.execute(
-                select(func.count(func.distinct(ImageRecord.id)))
-                .select_from(ImageRecord)
-                .join(ImageProvenance, ImageProvenance.image_record_id == ImageRecord.id)
-                .join(Source, Source.id == ImageProvenance.source_id)
-                .where(Source.artist_id == aid)
+                select(func.count(ImageRecord.id))
+                .where(ImageRecord.artist_id == aid)
             )
         ).scalar_one()
 
@@ -162,11 +156,7 @@ class ArtistService:
         # over ImageRecord fails in Postgres because its json columns have
         # no equality operator.
         stmt = select(ImageRecord).where(
-            ImageRecord.id.in_(
-                select(ImageProvenance.image_record_id)
-                .join(Source, Source.id == ImageProvenance.source_id)
-                .where(Source.artist_id == artist.id)
-            )
+            ImageRecord.artist_id == artist.id
         )
         if cursor:
             cur_ts, cur_id = decode_cursor(cursor)