Engineering notes — things I keep re-explaining, written down once.
- Error Tracking vs Uptime Monitoring: Cron Heartbeats and Silent Failures
- Rate-limited user reminders — queue batching, worker concurrency, email/SMS limits
- How to receive queued jobs securely on a public HTTPS push endpoint in Node.js
- Scheduled Database Cleanup on Large Postgres Datasets: Cron Trigger or Queue Worker?
- Retry backoff for failed jobs: delayed queue messages or in-worker sleeps?