added route for waiting time

backend/main.py

+from datetime import timedelta
 from typing import List
 from fastapi import Body, Depends, FastAPI
 from fastapi.middleware.cors import CORSMiddleware
@@ -50,6 +51,11 @@ async def post(record: schemas.RecordBase = Body(...), db: Session = Depends(get
     return crud.create_record(record, db)
 
 
+@app.get('/api/{place}/waiting_time', response_model=timedelta)
+async def waiting_time(place: str, db: Session = Depends(get_db)):
+    return crud.get_waiting_time(place, db)
+
+
 """
 import cv2
 import numpy as np