diff --git a/packages/dbgpt-core/src/dbgpt/storage/base.py b/packages/dbgpt-core/src/dbgpt/storage/base.py
index c52f6ec24..b14e0661b 100644
--- a/packages/dbgpt-core/src/dbgpt/storage/base.py
+++ b/packages/dbgpt-core/src/dbgpt/storage/base.py
@@ -1,4 +1,5 @@
 """Index store base class."""
+
 import asyncio
 import logging
 import time
@@ -192,13 +193,15 @@ class IndexStoreBase(ABC):
             logger.info(f"Loaded {loaded_cnt} chunks, total {len(chunks)} chunks.")
 
         return ids
+
     async def _run_tasks_with_concurrency(self, tasks, max_concurrent):
         results = []
         for i in range(0, len(tasks), max_concurrent):
-            batch = tasks[i:i + max_concurrent]
+            batch = tasks[i : i + max_concurrent]
             batch_results = await asyncio.gather(*batch, return_exceptions=True)
             results.extend(batch_results)
         return results
+
     def similar_search(
         self, text: str, topk: int, filters: Optional[MetadataFilters] = None
     ) -> List[Chunk]:
diff --git a/packages/dbgpt-ext/src/dbgpt_ext/storage/vector_store/chroma_store.py b/packages/dbgpt-ext/src/dbgpt_ext/storage/vector_store/chroma_store.py
index c2a1f01ed..ef91ced42 100644
--- a/packages/dbgpt-ext/src/dbgpt_ext/storage/vector_store/chroma_store.py
+++ b/packages/dbgpt-ext/src/dbgpt_ext/storage/vector_store/chroma_store.py
@@ -291,7 +291,7 @@ class ChromaStore(VectorStoreBase):
         logger.info(f"Total IDs to delete: {total}")
 
         for i in range(0, total, batch_size):
-            batch_ids = id_list[i:i + batch_size]
+            batch_ids = id_list[i : i + batch_size]
             logger.info(f"Deleting batch {i // batch_size + 1}: {len(batch_ids)} IDs")
             try:
                 self._collection.delete(ids=batch_ids)