Update config_controller.py

config_controller.py

@@ -1,5 +1,6 @@
 from fastapi import APIRouter, Request, HTTPException
 from service_config import ServiceConfig
+import json
 
 router = APIRouter()
 service_config = ServiceConfig()
@@ -29,7 +30,6 @@ async def update_config(request: Request):
     service_config.spark_endpoint = spark_endpoint
 
     with open(service_config.config_path, "w", encoding="utf-8") as f:
-        import json
         json.dump(service_config, f, indent=2)
 
     return {"message": "Configuration updated successfully"}