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server/services/cron_manager.js

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+import cron from 'node-cron';
+
+const task_id_to_cron_job = new Map();
+
+export function stop_all_cron_jobs() {
+  for (const job of task_id_to_cron_job.values()) {
+    job.stop();
+  }
+  task_id_to_cron_job.clear();
+}
+
+export function upsert_cron_job(schedule_task_id, cron_expression, on_tick) {
+  const existing = task_id_to_cron_job.get(schedule_task_id);
+  if (existing) {
+    existing.stop();
+    task_id_to_cron_job.delete(schedule_task_id);
+  }
+
+  const job = cron.schedule(cron_expression, on_tick, { scheduled: true });
+  task_id_to_cron_job.set(schedule_task_id, job);
+}
+
+export function remove_cron_job(schedule_task_id) {
+  const job = task_id_to_cron_job.get(schedule_task_id);
+  if (!job) {
+    return;
+  }
+  job.stop();
+  task_id_to_cron_job.delete(schedule_task_id);
+}