fix: close library upload flow and harden image storage

pigway_frame_flow/scheduler/upload_retries.py

@@ -64,14 +64,7 @@ class UploadRetries:
         )
         # Only disposable generated staging files are owned by this recovery.
         if row and row["kind"] == "cache" and not (meta and meta["starred"]):
-            self.service.assets.path(asset_id).unlink(missing_ok=True)
-            with self.db.transaction() as tx:
-                for table, field in (
-                    ("assets", "id"),
-                    ("asset_sources", "asset_id"),
-                    ("asset_metadata", "asset_id"),
-                ):
-                    tx.execute(f"DELETE FROM {table} WHERE {field}=?", (asset_id,))
+            self.service.libraries.remove_asset(asset_id)
 
     def tick(self, current):
         for job in self.db.all("SELECT * FROM jobs WHERE enabled=1"):