Added new endpoints under /forecast/narrative

internal/adapters/outbound/postgres/forecast_read.go

@@ -1,4 +1,4 @@
-// forecast_read.go executes hourly forecast and period queries.
+// forecast_read.go executes forecast and period queries.
 // Layer: adapters/outbound/postgres forecast feature.
 package postgres
 
@@ -12,12 +12,24 @@ import (
 )
 
 func (r *Repository) LatestHourlyForecast(ctx context.Context) (*model.WeatherForecastRun, error) {
+	return r.loadLatestForecastRun(ctx, queryLatestHourlyForecast, "hourly")
+}
+
+func (r *Repository) LatestNarrativeForecast(ctx context.Context) (*model.WeatherForecastRun, error) {
+	return r.loadLatestForecastRun(ctx, queryLatestNarrativeForecast, "narrative")
+}
+
+func (r *Repository) loadLatestForecastRun(
+	ctx context.Context,
+	parentQuery string,
+	productLabel string,
+) (*model.WeatherForecastRun, error) {
 	if r == nil || r.db == nil {
 		return nil, fmt.Errorf("postgres repository is not configured")
 	}
 
 	var row forecastParentRow
-	err := r.db.QueryRowContext(ctx, queryLatestHourlyForecast).Scan(
+	err := r.db.QueryRowContext(ctx, parentQuery).Scan(
 		&row.EventID,
 		&row.LocationID,
 		&row.LocationName,
@@ -32,7 +44,7 @@ func (r *Repository) LatestHourlyForecast(ctx context.Context) (*model.WeatherFo
 		return nil, nil
 	}
 	if err != nil {
-		return nil, fmt.Errorf("query latest hourly forecast: %w", err)
+		return nil, fmt.Errorf("query latest %s forecast: %w", productLabel, err)
 	}
 
 	run := mapForecastParentRow(row)