feat: add Hetzner-hosted todo application stack

Implement the server-rendered Go todo application with PostgreSQL persistence, Tailwind styling, health checks, and test coverage.

Provision production and staging infrastructure with OpenTofu, including private networking, static IPs, Object Storage backups, and load balancing.

Configure Rocky Linux hosts with Ansible, rootless Podman, PostgreSQL, WAL-G backup automation, staging restores, and generated inventory.

app/internal/db/store_test.go

@@ -0,0 +1,57 @@
+package db
+
+import (
+	"context"
+	"os"
+	"strconv"
+	"testing"
+	"time"
+)
+
+func TestStoreLifecycle(t *testing.T) {
+	databaseURL := os.Getenv("TEST_DATABASE_URL")
+	if databaseURL == "" {
+		t.Skip("TEST_DATABASE_URL is not set")
+	}
+	store, err := Open(databaseURL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = store.Close() })
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	title := "store-test-" + strconv.FormatInt(time.Now().UnixNano(), 10)
+	if err := store.Create(ctx, title); err != nil {
+		t.Fatal(err)
+	}
+
+	todos, err := store.List(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var id int64
+	for _, todo := range todos {
+		if todo.Title == title {
+			id = todo.ID
+			break
+		}
+	}
+	if id == 0 {
+		t.Fatalf("created todo %q not found", title)
+	}
+	t.Cleanup(func() { _, _ = store.Delete(context.Background(), id) })
+
+	found, err := store.Toggle(ctx, id)
+	if err != nil || !found {
+		t.Fatalf("toggle found = %v, error = %v", found, err)
+	}
+	found, err = store.Delete(ctx, id)
+	if err != nil || !found {
+		t.Fatalf("delete found = %v, error = %v", found, err)
+	}
+	found, err = store.Delete(ctx, id)
+	if err != nil || found {
+		t.Fatalf("second delete found = %v, error = %v", found, err)
+	}
+}