Add 10-second test 2 health logger and /_cron/tick endpoint

backend/src/index.ts

@@ -1,6 +1,7 @@
 import 'dotenv/config';
 import cors from 'cors';
 import express, { type NextFunction, type Request, type Response } from 'express';
+import cron from 'node-cron';
 import { buildApiPath, getConfig } from './config';
 import { TursoClient } from './lib/db';
 import { createHealthRouter } from './routes/health';
@@ -18,12 +19,17 @@ const apiRoot = config.apiPrefix || '/';
 app.use(apiRoot, createHealthRouter(config));
 app.use(apiRoot, createTodosRouter(config, db));
 
-// 1. Background 10-second health check logger
-setInterval(() => {
-  console.log('[Health Check] Sandbox is healthy at ' + new Date().toISOString());
-}, 10000);
+// 1. Cron Job A: Runs every 3 minutes
+cron.schedule('*/3 * * * *', () => {
+  console.log('[Cron A] Heartbeat executing every 3 minutes: ' + new Date().toISOString());
+});
 
-// 2. Cloud Run Cron Tick endpoint (No-op to wake up event loop)
+// 2. Cron Job B: Runs every 10 minutes
+cron.schedule('*/10 * * * *', () => {
+  console.log('[Cron B] Heartbeat executing every 10 minutes: ' + new Date().toISOString());
+});
+
+// 3. Cloud Run Cron Tick endpoint (No-op to wake up event loop)
 app.post('/_cron/tick', (req, res) => {
   const authHeader = req.headers.authorization;
   if (!authHeader || authHeader !== 'Bearer ' + process.env.CRON_TOKEN) {