Add no cache header to morecast -> WF1 requests (#3971)

Adds no cache header to morecast -> WF1 requests to eliminate possibility of cached forecasts where we need the most up to date data.

api/app/morecast_v2/forecasts.py

@@ -11,7 +11,7 @@
 from app.db.crud.morecast_v2 import get_forecasts_in_range
 from app.schemas.morecast_v2 import MoreCastForecastOutput, MoreCastForecastInput, StationDailyFromWF1, WF1ForecastRecordType, WF1PostForecast, WeatherIndeterminate, WeatherDeterminate
 from app.wildfire_one.schema_parsers import WFWXWeatherStation
-from app.wildfire_one.wfwx_api import get_auth_header, get_forecasts_for_stations_by_date_range, get_wfwx_stations_from_station_codes
+from app.wildfire_one.wfwx_api import get_forecasts_for_stations_by_date_range, get_no_cache_auth_header, get_wfwx_stations_from_station_codes
 from app.fire_behaviour import cffdrs
 
 
@@ -61,7 +61,7 @@ def construct_wf1_forecast(forecast: MoreCastForecastInput, stations: List[WFWXW
 
 async def construct_wf1_forecasts(session: ClientSession, forecast_records: List[MoreCastForecastInput], stations: List[WFWXWeatherStation], username: str) -> List[WF1PostForecast]:
     # Fetch existing forecasts from WF1 for the stations and date range in the forecast records
-    header = await get_auth_header(session)
+    header = await get_no_cache_auth_header(session)
     forecast_dates = [datetime.fromtimestamp(f.for_date / 1000, timezone.utc) for f in forecast_records]
     min_forecast_date = min(forecast_dates)
     max_forecast_date = max(forecast_dates)

api/app/wildfire_one/wfwx_api.py

@@ -67,6 +67,15 @@ async def get_auth_header(session: ClientSession) -> dict:
     return header
 
 
+async def get_no_cache_auth_header(session: ClientSession) -> dict:
+    """Get WFWX auth header with explicit no caching"""
+    # Fetch auth header
+    header = await get_auth_header(session)
+    # Add the cache control header
+    header["Cache-Control"] = "no-cache"
+    return header
+
+
 async def get_stations_by_codes(station_codes: List[int]) -> List[WeatherStation]:
     """Get a list of stations by code, from WFWX Fireweather API."""
     logger.info("Using WFWX to retrieve stations by code")