format exchange timestamp in local timezone, format this file

app/src/integrations/exchange/service.py

@@ -1,5 +1,9 @@
 from __future__ import annotations
 
+from datetime import datetime
+from zoneinfo import ZoneInfo
+from src.core.config import load_settings
+
 from src.core.config import load_settings
 from src.integrations.exchange.exceptions import ExchangeError
 from src.integrations.exchange.mock_data import (
@@ -56,9 +60,7 @@ class ExchangeService:
         if price_raw is None:
             raise ExchangeError("Field 'lastPrice' is missing in ticker response.")
 
-        from datetime import datetime
-        from zoneinfo import ZoneInfo
-        from src.core.config import load_settings
+        close_time = payload.get("closeTime") or payload.get("eventTime") or ""
 
         settings = load_settings()