Update postgres_impl.py

lightrag/kg/postgres_impl.py

@@ -308,6 +308,7 @@ class PGKVStorage(BaseKVStorage):
         drop_sql = SQL_TEMPLATES["drop_all"]
         await self.db.execute(drop_sql)
 
+
 @final
 @dataclass
 class PGVectorStorage(BaseVectorStorage):
@@ -549,11 +550,13 @@ class PGDocStatusStorage(DocStatusStorage):
                 },
             )
         return data
+
     async def drop(self) -> None:
         """Drop the storage"""
         drop_sql = SQL_TEMPLATES["drop_doc_full"]
         await self.db.execute(drop_sql)
 
+
 class PGGraphQueryException(Exception):
     """Exception for the AGE queries."""
 
@@ -1041,6 +1044,7 @@ class PGGraphStorage(BaseGraphStorage):
         drop_sql = SQL_TEMPLATES["drop_vdb_relation"]
         await self.db.execute(drop_sql)
 
+
 NAMESPACE_TABLE_MAP = {
     NameSpace.KV_STORE_FULL_DOCS: "LIGHTRAG_DOC_FULL",
     NameSpace.KV_STORE_TEXT_CHUNKS: "LIGHTRAG_DOC_CHUNKS",
@@ -1245,5 +1249,4 @@ SQL_TEMPLATES = {
     "drop_vdb_relation": """
 	    DROP TABLE IF EXISTS LIGHTRAG_VDB_RELATION CASCADE;
        """,
-
 }