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 (
@@ -55,13 +59,11 @@ class ExchangeService:
         price_raw = payload.get("lastPrice")
         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()
-
+        
         if close_time:
             dt_utc = datetime.fromtimestamp(int(close_time) / 1000, tz=ZoneInfo("UTC"))
             dt_local = dt_utc.astimezone(ZoneInfo(settings.tz))