fix

app/services/ranking.py

@@ -27,7 +27,7 @@ def save_geo_cache():
 
 load_geo_cache()
 
-def geo_coords(city_name: str) -> tuple | None:
+def geo_coords(city_name: str) -> tuple:
     """
     Geocodes a city name to (latitude, longitude).
     Uses an in-memory cache to avoid repeated API calls.