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

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' });
 });