convex-migration-helper

Convex schema migrations without downtime use additive changes, data backfilling mutations, and dual-write patterns to maintain application availability during schema evolution.

To add a required field to a Convex database, add it as optional first, run backfilling mutations to populate existing records, then enforce it as required in the schema.

Yes, changing data types or splitting tables in Convex uses batch processing and dual-write patterns to write data to both old and new structures, preventing application breaks.

The convex-migration-helper supports renaming fields by guiding developers through additive schema modifications and backfilling existing data before removing the old field.

Zero-downtime data backfilling in Convex requires batch processing to avoid exceeding system limits, and dual-write strategies must be maintained until all old data structures are fully migrated.