diff --git a/lightrag/kg/chroma_impl.py b/lightrag/kg/chroma_impl.py
index cb3b59f1..e32346f9 100644
--- a/lightrag/kg/chroma_impl.py
+++ b/lightrag/kg/chroma_impl.py
@@ -1,6 +1,6 @@
 import asyncio
 from dataclasses import dataclass
-from typing import Union
+from typing import Any
 import numpy as np
 from chromadb import HttpClient, PersistentClient
 from chromadb.config import Settings
@@ -102,7 +102,7 @@ class ChromaVectorDBStorage(BaseVectorStorage):
             logger.error(f"ChromaDB initialization failed: {str(e)}")
             raise
 
-    async def upsert(self, data: dict[str, dict]):
+    async def upsert(self, data: dict[str, dict[str, Any]]) -> None:
         if not data:
             logger.warning("Empty data provided to vector DB")
             return []
@@ -151,7 +151,7 @@ class ChromaVectorDBStorage(BaseVectorStorage):
             logger.error(f"Error during ChromaDB upsert: {str(e)}")
             raise
 
-    async def query(self, query: str, top_k=5) -> Union[dict, list[dict]]:
+    async def query(self, query: str, top_k: int) -> list[dict[str, Any]]:
         try:
             embedding = await self.embedding_func([query])
 
@@ -183,6 +183,15 @@ class ChromaVectorDBStorage(BaseVectorStorage):
             logger.error(f"Error during ChromaDB query: {str(e)}")
             raise
 
-    async def index_done_callback(self):
+
+    async def index_done_callback(self) -> None:
         # ChromaDB handles persistence automatically
         pass
+
+    async def delete_entity(self, entity_name: str) -> None:
+        """Delete a single entity by its name"""
+        raise NotImplementedError
+
+    async def delete_entity_relation(self, entity_name: str) -> None:
+        """Delete relations for a given entity by scanning metadata"""
+        raise NotImplementedError
\ No newline at end of file
diff --git a/lightrag/kg/faiss_impl.py b/lightrag/kg/faiss_impl.py
index 9a5f7e4e..3027f3f0 100644
--- a/lightrag/kg/faiss_impl.py
+++ b/lightrag/kg/faiss_impl.py
@@ -1,6 +1,7 @@
 import os
 import time
 import asyncio
+from typing import Any
 import faiss
 import json
 import numpy as np
@@ -57,7 +58,7 @@ class FaissVectorDBStorage(BaseVectorStorage):
         # Attempt to load an existing index + metadata from disk
         self._load_faiss_index()
 
-    async def upsert(self, data: dict[str, dict]):
+    async def upsert(self, data: dict[str, dict[str, Any]]) -> None:
         """
         Insert or update vectors in the Faiss index.
 
@@ -147,7 +148,7 @@ class FaissVectorDBStorage(BaseVectorStorage):
         logger.info(f"Upserted {len(list_data)} vectors into Faiss index.")
         return [m["__id__"] for m in list_data]
 
-    async def query(self, query: str, top_k=5):
+    async def query(self, query: str, top_k: int) -> list[dict[str, Any]]:
         """
         Search by a textual query; returns top_k results with their metadata + similarity distance.
         """
@@ -210,7 +211,7 @@ class FaissVectorDBStorage(BaseVectorStorage):
             f"Successfully deleted {len(to_remove)} vectors from {self.namespace}"
         )
 
-    async def delete_entity(self, entity_name: str):
+    async def delete_entity(self, entity_name: str) -> None:
         """
         Delete a single entity by computing its hashed ID
         the same way your code does it with `compute_mdhash_id`.
@@ -234,7 +235,7 @@ class FaissVectorDBStorage(BaseVectorStorage):
             self._remove_faiss_ids(relations)
             logger.debug(f"Deleted {len(relations)} relations for {entity_name}")
 
-    async def index_done_callback(self):
+    async def index_done_callback(self) -> None:
         """
         Called after indexing is done (save Faiss index + metadata).
         """
diff --git a/lightrag/kg/milvus_impl.py b/lightrag/kg/milvus_impl.py
index f4d9d47f..d67f03b1 100644
--- a/lightrag/kg/milvus_impl.py
+++ b/lightrag/kg/milvus_impl.py
@@ -1,5 +1,6 @@
 import asyncio
 import os
+from typing import Any
 from tqdm.asyncio import tqdm as tqdm_async
 from dataclasses import dataclass
 import numpy as np
@@ -71,7 +72,7 @@ class MilvusVectorDBStorage(BaseVectorStorage):
             dimension=self.embedding_func.embedding_dim,
         )
 
-    async def upsert(self, data: dict[str, dict]):
+    async def upsert(self, data: dict[str, dict[str, Any]]) -> None:
         logger.info(f"Inserting {len(data)} vectors to {self.namespace}")
         if not len(data):
             logger.warning("You insert an empty data to vector DB")
@@ -106,7 +107,7 @@ class MilvusVectorDBStorage(BaseVectorStorage):
         results = self._client.upsert(collection_name=self.namespace, data=list_data)
         return results
 
-    async def query(self, query, top_k=5):
+    async def query(self, query: str, top_k: int) -> list[dict[str, Any]]:
         embedding = await self.embedding_func([query])
         results = self._client.search(
             collection_name=self.namespace,
@@ -123,3 +124,14 @@ class MilvusVectorDBStorage(BaseVectorStorage):
             {**dp["entity"], "id": dp["id"], "distance": dp["distance"]}
             for dp in results[0]
         ]
+
+    async def index_done_callback(self) -> None:
+        pass
+    
+    async def delete_entity(self, entity_name: str) -> None:
+        """Delete a single entity by its name"""
+        raise NotImplementedError
+
+    async def delete_entity_relation(self, entity_name: str) -> None:
+        """Delete relations for a given entity by scanning metadata"""
+        raise NotImplementedError
\ No newline at end of file
diff --git a/lightrag/kg/mongo_impl.py b/lightrag/kg/mongo_impl.py
index c216e7be..39bb9f18 100644
--- a/lightrag/kg/mongo_impl.py
+++ b/lightrag/kg/mongo_impl.py
@@ -844,7 +844,7 @@ class MongoVectorDBStorage(BaseVectorStorage):
         except PyMongoError as _:
             logger.debug("vector index already exist")
 
-    async def upsert(self, data: dict[str, dict]):
+    async def upsert(self, data: dict[str, dict[str, Any]]) -> None:
         logger.debug(f"Inserting {len(data)} vectors to {self.namespace}")
         if not data:
             logger.warning("You are inserting an empty data set to vector DB")
@@ -887,7 +887,7 @@ class MongoVectorDBStorage(BaseVectorStorage):
 
         return list_data
 
-    async def query(self, query, top_k=5):
+    async def query(self, query: str, top_k: int) -> list[dict[str, Any]]:
         """Queries the vector database using Atlas Vector Search."""
         # Generate the embedding
         embedding = await self.embedding_func([query])
@@ -921,6 +921,16 @@ class MongoVectorDBStorage(BaseVectorStorage):
             for doc in results
         ]
 
+    async def index_done_callback(self) -> None:
+        pass
+    
+    async def delete_entity(self, entity_name: str) -> None:
+        """Delete a single entity by its name"""
+        raise NotImplementedError
+
+    async def delete_entity_relation(self, entity_name: str) -> None:
+        """Delete relations for a given entity by scanning metadata"""
+        raise NotImplementedError
 
 def create_collection_if_not_exists(uri: str, database_name: str, collection_name: str):
     """Check if the collection exists. if not, create it."""
diff --git a/lightrag/kg/nano_vector_db_impl.py b/lightrag/kg/nano_vector_db_impl.py
index 5d786646..8b931424 100644
--- a/lightrag/kg/nano_vector_db_impl.py
+++ b/lightrag/kg/nano_vector_db_impl.py
@@ -50,6 +50,7 @@ Usage:
 
 import asyncio
 import os
+from typing import Any
 from tqdm.asyncio import tqdm as tqdm_async
 from dataclasses import dataclass
 import numpy as np
@@ -95,7 +96,7 @@ class NanoVectorDBStorage(BaseVectorStorage):
             self.embedding_func.embedding_dim, storage_file=self._client_file_name
         )
 
-    async def upsert(self, data: dict[str, dict]):
+    async def upsert(self, data: dict[str, dict[str, Any]]) -> None:
         logger.info(f"Inserting {len(data)} vectors to {self.namespace}")
         if not len(data):
             logger.warning("You insert an empty data to vector DB")
@@ -139,7 +140,7 @@ class NanoVectorDBStorage(BaseVectorStorage):
                 f"embedding is not 1-1 with data, {len(embeddings)} != {len(list_data)}"
             )
 
-    async def query(self, query: str, top_k=5):
+    async def query(self, query: str, top_k: int) -> list[dict[str, Any]]:
         embedding = await self.embedding_func([query])
         embedding = embedding[0]
         results = self._client.query(
@@ -176,7 +177,7 @@ class NanoVectorDBStorage(BaseVectorStorage):
         except Exception as e:
             logger.error(f"Error while deleting vectors from {self.namespace}: {e}")
 
-    async def delete_entity(self, entity_name: str):
+    async def delete_entity(self, entity_name: str) -> None:
         try:
             entity_id = compute_mdhash_id(entity_name, prefix="ent-")
             logger.debug(
@@ -211,7 +212,7 @@ class NanoVectorDBStorage(BaseVectorStorage):
         except Exception as e:
             logger.error(f"Error deleting relations for {entity_name}: {e}")
 
-    async def index_done_callback(self):
+    async def index_done_callback(self) -> None:
         # Protect file write operation
         async with self._save_lock:
             self._client.save()
diff --git a/lightrag/kg/oracle_impl.py b/lightrag/kg/oracle_impl.py
index 65f1060c..197d101e 100644
--- a/lightrag/kg/oracle_impl.py
+++ b/lightrag/kg/oracle_impl.py
@@ -307,7 +307,7 @@ class OracleKVStorage(BaseKVStorage):
 
                     await self.db.execute(upsert_sql, _data)
 
-    async def index_done_callback(self):
+    async def index_done_callback(self) -> None:
         if is_namespace(
             self.namespace,
             (NameSpace.KV_STORE_FULL_DOCS, NameSpace.KV_STORE_TEXT_CHUNKS),
@@ -330,16 +330,14 @@ class OracleVectorDBStorage(BaseVectorStorage):
             )
         self.cosine_better_than_threshold = cosine_threshold
 
-    async def upsert(self, data: dict[str, dict]):
-        """向向量数据库中插入数据"""
+    async def upsert(self, data: dict[str, dict[str, Any]]) -> None:
         pass
 
     async def index_done_callback(self):
         pass
 
     #################### query method ###############
-    async def query(self, query: str, top_k=5) -> Union[dict, list[dict]]:
-        """从向量数据库中查询数据"""
+    async def query(self, query: str, top_k: int) -> list[dict[str, Any]]:
         embeddings = await self.embedding_func([query])
         embedding = embeddings[0]
         # 转换精度
@@ -359,6 +357,13 @@ class OracleVectorDBStorage(BaseVectorStorage):
         # print("vector search result:",results)
         return results
 
+    async def delete_entity(self, entity_name: str) -> None:
+        """Delete a single entity by its name"""
+        raise NotImplementedError
+
+    async def delete_entity_relation(self, entity_name: str) -> None:
+        """Delete relations for a given entity by scanning metadata"""
+        raise NotImplementedError
 
 @dataclass
 class OracleGraphStorage(BaseGraphStorage):
diff --git a/lightrag/kg/postgres_impl.py b/lightrag/kg/postgres_impl.py
index a44aefe7..5dbc6a8e 100644
--- a/lightrag/kg/postgres_impl.py
+++ b/lightrag/kg/postgres_impl.py
@@ -287,7 +287,7 @@ class PGKVStorage(BaseKVStorage):
 
                     await self.db.execute(upsert_sql, _data)
 
-    async def index_done_callback(self):
+    async def index_done_callback(self) -> None:
         if is_namespace(
             self.namespace,
             (NameSpace.KV_STORE_FULL_DOCS, NameSpace.KV_STORE_TEXT_CHUNKS),
@@ -352,7 +352,7 @@ class PGVectorStorage(BaseVectorStorage):
         }
         return upsert_sql, data
 
-    async def upsert(self, data: Dict[str, dict]):
+    async def upsert(self, data: dict[str, dict[str, Any]]) -> None:
         logger.info(f"Inserting {len(data)} vectors to {self.namespace}")
         if not len(data):
             logger.warning("You insert an empty data to vector DB")
@@ -398,12 +398,11 @@ class PGVectorStorage(BaseVectorStorage):
 
             await self.db.execute(upsert_sql, data)
 
-    async def index_done_callback(self):
+    async def index_done_callback(self) -> None:
         logger.info("vector data had been saved into postgresql db!")
 
     #################### query method ###############
-    async def query(self, query: str, top_k=5) -> Union[dict, list[dict]]:
-        """从向量数据库中查询数据"""
+    async def query(self, query: str, top_k: int) -> list[dict[str, Any]]:
         embeddings = await self.embedding_func([query])
         embedding = embeddings[0]
         embedding_string = ",".join(map(str, embedding))
@@ -417,6 +416,13 @@ class PGVectorStorage(BaseVectorStorage):
         results = await self.db.query(sql, params=params, multirows=True)
         return results
 
+    async def delete_entity(self, entity_name: str) -> None:
+        """Delete a single entity by its name"""
+        raise NotImplementedError
+
+    async def delete_entity_relation(self, entity_name: str) -> None:
+        """Delete relations for a given entity by scanning metadata"""
+        raise NotImplementedError
 
 @dataclass
 class PGDocStatusStorage(DocStatusStorage):
diff --git a/lightrag/kg/qdrant_impl.py b/lightrag/kg/qdrant_impl.py
index 3af76328..18a50082 100644
--- a/lightrag/kg/qdrant_impl.py
+++ b/lightrag/kg/qdrant_impl.py
@@ -1,5 +1,6 @@
 import asyncio
 import os
+from typing import Any
 from tqdm.asyncio import tqdm as tqdm_async
 from dataclasses import dataclass
 import numpy as np
@@ -85,7 +86,7 @@ class QdrantVectorDBStorage(BaseVectorStorage):
             ),
         )
 
-    async def upsert(self, data: dict[str, dict]):
+    async def upsert(self, data: dict[str, dict[str, Any]]) -> None:
         if not len(data):
             logger.warning("You insert an empty data to vector DB")
             return []
@@ -130,7 +131,7 @@ class QdrantVectorDBStorage(BaseVectorStorage):
         )
         return results
 
-    async def query(self, query, top_k=5):
+    async def query(self, query: str, top_k: int) -> list[dict[str, Any]]:
         embedding = await self.embedding_func([query])
         results = self._client.search(
             collection_name=self.namespace,
@@ -143,3 +144,14 @@ class QdrantVectorDBStorage(BaseVectorStorage):
         logger.debug(f"query result: {results}")
 
         return [{**dp.payload, "id": dp.id, "distance": dp.score} for dp in results]
+
+    async def index_done_callback(self) -> None:
+        pass
+    
+    async def delete_entity(self, entity_name: str) -> None:
+        """Delete a single entity by its name"""
+        raise NotImplementedError
+
+    async def delete_entity_relation(self, entity_name: str) -> None:
+        """Delete relations for a given entity by scanning metadata"""
+        raise NotImplementedError
\ No newline at end of file
diff --git a/lightrag/kg/tidb_impl.py b/lightrag/kg/tidb_impl.py
index 00b8003d..a5a5c80d 100644
--- a/lightrag/kg/tidb_impl.py
+++ b/lightrag/kg/tidb_impl.py
@@ -227,7 +227,7 @@ class TiDBVectorDBStorage(BaseVectorStorage):
             )
         self.cosine_better_than_threshold = cosine_threshold
 
-    async def query(self, query: str, top_k: int) -> list[dict]:
+    async def query(self, query: str, top_k: int) -> list[dict[str, Any]]:
         """Search from tidb vector"""
         embeddings = await self.embedding_func([query])
         embedding = embeddings[0]
@@ -249,7 +249,7 @@ class TiDBVectorDBStorage(BaseVectorStorage):
         return results
 
     ###### INSERT entities And relationships ######
-    async def upsert(self, data: dict[str, dict]):
+    async def upsert(self, data: dict[str, dict[str, Any]]) -> None:
         # ignore, upsert in TiDBKVStorage already
         if not len(data):
             logger.warning("You insert an empty data to vector DB")
@@ -333,6 +333,14 @@ class TiDBVectorDBStorage(BaseVectorStorage):
         return await self.db.query(SQL, params, multirows=True)
 
 
+    async def delete_entity(self, entity_name: str) -> None:
+        """Delete a single entity by its name"""
+        raise NotImplementedError
+
+    async def delete_entity_relation(self, entity_name: str) -> None:
+        """Delete relations for a given entity by scanning metadata"""
+        raise NotImplementedError
+    
 @dataclass
 class TiDBGraphStorage(BaseGraphStorage):
     # db instance must be injected before use