convex-migration-helper

Zero-downtime Convex migrations use the widen-migrate-narrow workflow to sequence schema expansions, data backfills, and schema cleanups. This multi-deploy pattern ensures breaking changes are applied safely without interrupting production traffic.

Backfilling Convex data without downtime involves integrating the @convex-dev/migrations component to batch and resume large data updates. This safely processes bulk records across tables while your application continues serving live traffic.

The widen-migrate-narrow workflow handles breaking schema changes by expanding the schema first, migrating existing data to the new format, and finally narrowing the schema to remove old fields. This sequencing prevents write failures during deployment.

Yes, the @convex-dev/migrations component supports resuming interrupted data migrations. It inherently batches large data operations and tracks progress, allowing paused or failed runs to resume safely without restarting.

Multi-deploy sequencing is necessary for adding or removing fields in Convex when handling breaking changes across production environments. Proper deploy sequencing ensures older application versions do not crash when encountering the updated schema.