Add 10-second health logger and /_cron/tick endpoint

backend/bun.lock

@@ -8,6 +8,7 @@
         "cors": "^2.8.5",
         "dotenv": "^17.2.0",
         "express": "^5.1.0",
+        "node-cron": "^4.5.0",
       },
       "devDependencies": {
         "@types/cors": "^2.8.19",
@@ -126,6 +127,8 @@
 
     "negotiator": ["negotiator@1.0.0", "", {}, "sha512-8Ofs/AUQh8MaEcrlq5xOX0CQ9ypTF5dl78mjlMNfOK08fzpgTHQRQPBxcPlEtIw0yRpws+Zo/3r+5WRby7u3Gg=="],
 
+    "node-cron": ["node-cron@4.5.0", "", {}, "sha512-4Trh+kjvbXokyJkwQumvD5YAgeJfgHLR/sKyu71uSmxfCR5QMO1hldpvmFZOICN5pLgNY+J5Y8+ar3XKo5/4tQ=="],
+
     "object-assign": ["object-assign@4.1.1", "", {}, "sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg=="],
 
     "object-inspect": ["object-inspect@1.13.4", "", {}, "sha512-W67iLl4J2EXEGTbfeHCffrjDfitvLANg0UlX3wFUUSTx92KXRFegMHUVgSqE+wvhAbi4WqjGg9czysTV2Epbew=="],

backend/package.json

@@ -11,7 +11,8 @@
   "dependencies": {
     "cors": "^2.8.5",
     "dotenv": "^17.2.0",
-    "express": "^5.1.0"
+    "express": "^5.1.0",
+    "node-cron": "^4.5.0"
   },
   "devDependencies": {
     "@types/cors": "^2.8.19",

backend/src/index.ts

@@ -18,6 +18,21 @@ const apiRoot = config.apiPrefix || '/';
 app.use(apiRoot, createHealthRouter(config));
 app.use(apiRoot, createTodosRouter(config, db));
 
+
+// 10-second health check logger
+setInterval(() => {
+  console.log('[Health Check] Sandbox is healthy at ' + new Date().toISOString());
+}, 10000);
+
+app.post('/_cron/tick', (req, res) => {
+  const authHeader = req.headers.authorization;
+  if (!authHeader || authHeader !== 'Bearer ' + process.env.CRON_TOKEN) {
+    return res.status(401).json({ success: false, error: 'Unauthorized' });
+  }
+  console.log('[Tick] Cloud Run cron tick triggered.');
+  res.status(200).json({ success: true });
+});
+
 app.use((_req, res) => {
   res.status(404).json({ success: false, error: 'Not found' });
 });