aded k6 and script and updated code with better logic and indexing on schema

k6/smoke.js

@@ -0,0 +1,23 @@
+import http from 'k6/http';
+import { check, sleep } from 'k6';
+
+export const options = {
+  vus: 1,
+  iterations: 10,
+  thresholds: {
+    http_req_failed: ['rate<0.01'],
+    http_req_duration: ['p(95)<500'],
+  },
+};
+
+export default function () {
+  const response = http.get('http://app:3000/users/');
+
+  check(response, {
+    'status is 200': (r) => r.status === 200,
+    'response is JSON': (r) =>
+      r.headers['Content-Type']?.includes('application/json'),
+  });
+
+  sleep(1);
+}