Fix backend cache stats import (build 271261149)

backend/app/db.py

@@ -1073,6 +1073,10 @@ def get_artwork_cache_stats() -> Dict[str, Any]:
     }
 
 
+def get_request_cache_stats() -> Dict[str, Any]:
+    return get_artwork_cache_stats()
+
+
 def update_request_cache_title(
     request_id: int, title: str, year: Optional[int] = None
 ) -> None: