Merge pull request #885 from YanSte/remove-unsused

Cleanup of code

lightrag/kg/tidb_impl.py

@@ -560,9 +560,6 @@ class TiDBGraphStorage(BaseGraphStorage):
     async def delete_node(self, node_id: str) -> None:
         raise NotImplementedError
 
-    async def get_all_labels(self) -> list[str]:
-        raise NotImplementedError
-
     async def get_knowledge_graph(
         self, node_label: str, max_depth: int = 5
     ) -> KnowledgeGraph: