Guides ยท Technology
Schema Migration Expand/Contract
Change schemas safely
Safe schema changes add columns/paths (expand), backfill and dual-read/write, migrate clients, then remove old fields (contract) once usage drops, reducing downtime risk.
- expand contract
- schema migration
- backfill
- dual write
- cleanup
Expand
Add new fields/tables; keep old in place; dual-write if needed.
Migrate
Backfill; move readers/writers gradually.
Contract
Remove old fields after confidence; clean code and docs.
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