refac: folder delete logic

backend/open_webui/models/chats.py

@@ -943,6 +943,16 @@ class ChatTable:
 
             return count
 
+    def count_chats_by_folder_id_and_user_id(self, folder_id: str, user_id: str) -> int:
+        with get_db() as db:
+            query = db.query(Chat).filter_by(user_id=user_id)
+
+            query = query.filter_by(folder_id=folder_id)
+            count = query.count()
+
+            log.info(f"Count of chats for folder '{folder_id}': {count}")
+            return count
+
     def delete_tag_by_id_and_user_id_and_tag_name(
         self, id: str, user_id: str, tag_name: str
     ) -> bool: