Add delete support for MongoKVStorage

lightrag/kg/mongo_impl.py

@@ -150,6 +150,21 @@ class MongoKVStorage(BaseKVStorage):
         # Mongo handles persistence automatically
         pass
         
+    async def delete(self, ids: list[str]) -> None:
+        """Delete documents with specified IDs
+        
+        Args:
+            ids: List of document IDs to be deleted
+        """
+        if not ids:
+            return
+            
+        try:
+            result = await self._data.delete_many({"_id": {"$in": ids}})
+            logger.info(f"Deleted {result.deleted_count} documents from {self.namespace}")
+        except PyMongoError as e:
+            logger.error(f"Error deleting documents from {self.namespace}: {e}")
+        
     async def drop(self) -> dict[str, str]:
         """Drop the storage by removing all documents in the collection.