diff --git a/lightrag/api/lightrag_server.py b/lightrag/api/lightrag_server.py
index 7c5fc581..7a50a512 100644
--- a/lightrag/api/lightrag_server.py
+++ b/lightrag/api/lightrag_server.py
@@ -16,6 +16,7 @@ import argparse
 from typing import List, Any, Literal, Optional, Dict
 from pydantic import BaseModel, Field, field_validator
 from lightrag import LightRAG, QueryParam
+from lightrag.base import DocProcessingStatus, DocStatus
 from lightrag.types import GPTKeywordExtractionFormat
 from lightrag.api import __api_version__
 from lightrag.utils import EmbeddingFunc
@@ -702,7 +703,7 @@ class QueryRequest(BaseModel):
     )
 
     history_turns: Optional[int] = Field(
-        ge=0
+        ge=0,
         default=None,
         description="Number of complete conversation turns (user-assistant pairs) to consider in the response context.",
     )
@@ -802,7 +803,6 @@ class DocsStatusesResponse(BaseModel):
     statuses: Dict[DocStatus, List[DocStatusResponse]] = {}
 
 
-
 def get_api_key_dependency(api_key: Optional[str]):
     if not api_key:
         # If no API key is configured, return a dummy dependency that always succeeds