Fix healthcheck endpoint (#288)

* fix healthcheck db query

apps/e2e/tests/healthcheck.spec.ts

@@ -0,0 +1,18 @@
+import { expect, test } from '@playwright/test';
+
+// Simple healthcheck test to verify the API is up and the database responds
+
+test.describe('Healthcheck endpoint', () => {
+  test('returns healthy status', async ({ request }) => {
+    const response = await request.get('/healthcheck');
+
+    expect(response.status()).toBe(200);
+
+    const body = await response.json();
+    expect(body).toEqual(
+      expect.objectContaining({
+        services: expect.objectContaining({ database: true }),
+      }),
+    );
+  });
+});