mongodb

Databases

Hot-Swapping Cron Schedules with MongoDB Change Streams

Hardcoded cron means a redeploy every time a schedule changes. Store schedules in the database and have a daemon react to edits with change streams. Here is the design and its failure handling.

Jul 23, 2026 8 min read mongodbchange-streamscrongoscheduling

Databases

The retryWrites=false Trap in Firestore's MongoDB Compatibility

Firestore speaks the MongoDB wire protocol, but rejects retryable writes. If your driver defaults to on, writes fail in a way that looks random. Here is why, and the fix.

Jul 19, 2026 7 min read firestoremongodbgoidempotencydatabases