convex-migration-helper

You run zero-downtime Convex migrations by following the widen-migrate-narrow workflow, which structures breaking changes and backfills into staged deployment cycles to prevent downtime and data inconsistencies.

The widen-migrate-narrow workflow is a staged process that broadens schema compatibility, migrates existing data, and then narrows the schema to finalize breaking changes safely without disrupting active backend operations.

Yes, you can use the @convex-dev/migrations component to orchestrate online migrations with automated batching, dry runs, and progress tracking to validate data changes before full deployment.

You backfill data in Convex without downtime by using the @convex-dev/migrations component to process records in batches, allowing dual-write and dual-read strategies to maintain application availability.

The best way to plan a rollback for a Convex schema change is to follow the widen-migrate-narrow workflow, which maintains dual-write compatibility and provides clear rollback strategies at each migration stage.

You need online migrations for Convex table reshaping when your changes require backfills or breaking schema alterations that cannot block active users or cause data inconsistencies.