diff --git a/lightrag/kg/json_doc_status_impl.py b/lightrag/kg/json_doc_status_impl.py
index 6c667891..050752eb 100644
--- a/lightrag/kg/json_doc_status_impl.py
+++ b/lightrag/kg/json_doc_status_impl.py
@@ -67,7 +67,4 @@ class JsonDocStatusStorage(DocStatusStorage):
     async def delete(self, doc_ids: list[str]):
         for doc_id in doc_ids:
             self._data.pop(doc_id, None)
-        await self.index_done_callback()
-
-    async def drop(self) -> None:
-        raise NotImplementedError
+        await self.index_done_callback()
\ No newline at end of file
diff --git a/lightrag/kg/json_kv_impl.py b/lightrag/kg/json_kv_impl.py
index 658e1239..7e13dea7 100644
--- a/lightrag/kg/json_kv_impl.py
+++ b/lightrag/kg/json_kv_impl.py
@@ -46,9 +46,6 @@ class JsonKVStorage(BaseKVStorage):
         left_data = {k: v for k, v in data.items() if k not in self._data}
         self._data.update(left_data)
 
-    async def drop(self) -> None:
-        self._data = {}
-
     async def delete(self, ids: list[str]) -> None:
         for doc_id in ids:
             self._data.pop(doc_id, None)
diff --git a/lightrag/kg/mongo_impl.py b/lightrag/kg/mongo_impl.py
index 4eb968cf..384bb604 100644
--- a/lightrag/kg/mongo_impl.py
+++ b/lightrag/kg/mongo_impl.py
@@ -117,11 +117,6 @@ class MongoKVStorage(BaseKVStorage):
         # Mongo handles persistence automatically
         pass
 
-    async def drop(self) -> None:
-        """Drop the collection"""
-        await self._data.drop()
-
-
 @final
 @dataclass
 class MongoDocStatusStorage(DocStatusStorage):
@@ -169,10 +164,6 @@ class MongoDocStatusStorage(DocStatusStorage):
             )
         await asyncio.gather(*update_tasks)
 
-    async def drop(self) -> None:
-        """Drop the collection"""
-        await self._data.drop()
-
     async def get_status_counts(self) -> dict[str, int]:
         """Get counts of documents in each status"""
         pipeline = [{"$group": {"_id": "$status", "count": {"$sum": 1}}}]
diff --git a/lightrag/kg/oracle_impl.py b/lightrag/kg/oracle_impl.py
index c9d8d1b5..16013fe8 100644
--- a/lightrag/kg/oracle_impl.py
+++ b/lightrag/kg/oracle_impl.py
@@ -320,10 +320,6 @@ class OracleKVStorage(BaseKVStorage):
         # Oracle handles persistence automatically
         pass
 
-    async def drop(self) -> None:
-        raise NotImplementedError
-
-
 @final
 @dataclass
 class OracleVectorDBStorage(BaseVectorStorage):
diff --git a/lightrag/kg/postgres_impl.py b/lightrag/kg/postgres_impl.py
index 5f845894..34c7c54d 100644
--- a/lightrag/kg/postgres_impl.py
+++ b/lightrag/kg/postgres_impl.py
@@ -300,11 +300,7 @@ class PGKVStorage(BaseKVStorage):
     async def index_done_callback(self) -> None:
         # PG handles persistence automatically
         pass
-
-    async def drop(self) -> None:
-        raise NotImplementedError
-
-
+    
 @final
 @dataclass
 class PGVectorStorage(BaseVectorStorage):
@@ -534,9 +530,6 @@ class PGDocStatusStorage(DocStatusStorage):
             )
         return data
 
-    async def drop(self) -> None:
-        raise NotImplementedError
-
 
 class PGGraphQueryException(Exception):
     """Exception for the AGE queries."""
diff --git a/lightrag/kg/redis_impl.py b/lightrag/kg/redis_impl.py
index 2d5c94ce..056fbc9e 100644
--- a/lightrag/kg/redis_impl.py
+++ b/lightrag/kg/redis_impl.py
@@ -58,11 +58,6 @@ class RedisKVStorage(BaseKVStorage):
         for k in data:
             data[k]["_id"] = k
 
-    async def drop(self) -> None:
-        keys = await self._redis.keys(f"{self.namespace}:*")
-        if keys:
-            await self._redis.delete(*keys)
-
     async def index_done_callback(self) -> None:
         # Redis handles persistence automatically
         pass
diff --git a/lightrag/kg/tidb_impl.py b/lightrag/kg/tidb_impl.py
index 6dbfb934..1cff0bd9 100644
--- a/lightrag/kg/tidb_impl.py
+++ b/lightrag/kg/tidb_impl.py
@@ -214,10 +214,6 @@ class TiDBKVStorage(BaseKVStorage):
         # Ti handles persistence automatically
         pass
 
-    async def drop(self) -> None:
-        raise NotImplementedError
-
-
 @final
 @dataclass
 class TiDBVectorDBStorage(BaseVectorStorage):