Added new endpoints under /forecast/narrative

internal/adapters/outbound/postgres/forecast_queries.go

@@ -1,4 +1,4 @@
-// forecast_queries.go contains SQL text for hourly forecast reads.
+// forecast_queries.go contains SQL text for forecast reads.
 // Layer: adapters/outbound/postgres forecast feature.
 package postgres
 
@@ -17,6 +17,22 @@ SELECT
 FROM forecasts
 WHERE product = 'hourly'
 ORDER BY issued_at DESC, event_emitted_at DESC
+LIMIT 1`
+
+	queryLatestNarrativeForecast = `
+SELECT
+  event_id,
+  location_id,
+  location_name,
+  issued_at,
+  updated_at,
+  product,
+  latitude,
+  longitude,
+  elevation_meters
+FROM forecasts
+WHERE product = 'narrative'
+ORDER BY issued_at DESC, event_emitted_at DESC
 LIMIT 1`
 
 	queryForecastPeriods = `

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)