convex-migrations

To add a new field without downtime, introduce it as an optional schema field first, then backfill existing records in batched pages to keep old and new documents readable throughout the migration.

The best way to remove or rename fields safely is to update application code in stages and clean up stored data only after the transition is fully complete, preventing broken reads or failed writes.

You backfill existing Convex documents by using batch pagination with migration tracking and recovery-safe mutations, allowing progress to resume if interrupted without corrupting data.

Yes, you can change field types or migrate indexes in Convex without breaking production reads by applying migration-friendly rollout patterns that keep both old and new documents readable throughout the process.

Updating a Convex schema directly causes failures because existing documents may not match the new required fields or types, breaking reads and writes until a staged, zero-downtime migration is performed.

Yes, you need to stage schema updates for zero-downtime Convex deployments to ensure both old and new application code can read documents consistently while backfilling or removing fields.