Initial MVP commit

internal/adapters/postgres/alerts_repo.go

@@ -0,0 +1,65 @@
+package postgres
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"gitea.maximumdirect.net/ejr/weatherapi/internal/core/ports"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type AlertRepository struct {
+	pool *pgxpool.Pool
+}
+
+func NewAlertRepository(pool *pgxpool.Pool) *AlertRepository {
+	return &AlertRepository{pool: pool}
+}
+
+func (r *AlertRepository) ListCurrentAlerts(ctx context.Context) ([]ports.AlertRecord, error) {
+	rows, err := r.pool.Query(ctx, queryCurrentAlerts)
+	if err != nil {
+		return nil, fmt.Errorf("query current alerts: %w", err)
+	}
+	defer rows.Close()
+
+	out := make([]ports.AlertRecord, 0)
+	for rows.Next() {
+		var effective sql.NullTime
+		var expires sql.NullTime
+		var severity sql.NullString
+		var event sql.NullString
+		var headline sql.NullString
+		var instruction sql.NullString
+		var description sql.NullString
+
+		if err := rows.Scan(
+			&effective,
+			&expires,
+			&severity,
+			&event,
+			&headline,
+			&instruction,
+			&description,
+		); err != nil {
+			return nil, fmt.Errorf("scan current alert row: %w", err)
+		}
+
+		out = append(out, ports.AlertRecord{
+			Effective:   ptrTime(effective),
+			Expires:     ptrTime(expires),
+			Severity:    ptrString(severity),
+			Event:       ptrString(event),
+			Headline:    ptrString(headline),
+			Instruction: ptrString(instruction),
+			Description: ptrString(description),
+		})
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("iterate current alert rows: %w", err)
+	}
+
+	return out, nil
+}