Made forecast-period conditionCode optional

internal/adapters/outbound/postgres/forecast_mapper.go

@@ -2,7 +2,11 @@
 // Layer: adapters/outbound/postgres forecast feature.
 package postgres
 
-import "gitea.maximumdirect.net/ejr/weatherfeeder/model"
+import (
+	"database/sql"
+
+	"gitea.maximumdirect.net/ejr/weatherfeeder/model"
+)
 
 func mapForecastParentRow(row forecastParentRow) model.WeatherForecastRun {
 	return model.WeatherForecastRun{
@@ -23,7 +27,7 @@ func mapForecastPeriodRow(row forecastPeriodRow) model.WeatherForecastPeriod {
 		EndTime:                           row.EndTime.UTC(),
 		Name:                              stringValue(row.Name),
 		IsDay:                             boolPtr(row.IsDay),
-		ConditionCode:                     model.WMOCode(row.ConditionCode),
+		ConditionCode:                     wmoCodePtr(row.ConditionCode),
 		TextDescription:                   stringValue(row.TextDescription),
 		TemperatureC:                      float64Ptr(row.TemperatureC),
 		TemperatureCMin:                   float64Ptr(row.TemperatureCMin),
@@ -43,3 +47,11 @@ func mapForecastPeriodRow(row forecastPeriodRow) model.WeatherForecastPeriod {
 		UVIndex:                           float64Ptr(row.UVIndex),
 	}
 }
+
+func wmoCodePtr(v sql.NullInt64) *model.WMOCode {
+	if !v.Valid {
+		return nil
+	}
+	out := model.WMOCode(v.Int64)
+	return &out
+}