clean imports

main.py

@@ -1,15 +1,16 @@
 import json
+import logging
 import sqlite3
 from contextlib import asynccontextmanager
-from fastapi import FastAPI, Query, HTTPException
-from typing import List, Optional
-from pydantic import BaseModel
-from data_loader import refresh_data
+from typing import List
+
 import numpy as np
+from fastapi import FastAPI, HTTPException, Query
 from pandas import Timestamp
-import logging
+from pydantic import BaseModel
 from starlette.responses import RedirectResponse
 
+from data_loader import refresh_data
 
 logger = logging.getLogger(__name__)