migrate
Safely migrate the schema + backfill data on a deployed Convex app with @convex-dev/migrations. TRIGGER when changing the schema on a live app, backfilling data, or after a schema-validation error from a change. SKIP a fresh local app.
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- Repository
- get-convex/convex-backend-skill
- Last source activity
- July 7, 2026 at 16:41
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- English
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- 6
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- 8
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- migrate
- description
- Safely migrate the schema + backfill data on a deployed Convex app with @convex-dev/migrations. TRIGGER when changing the schema on a live app, backfilling data, or after a schema-validation error from a change. SKIP a fresh local app.
# Migrate the schema / data on a live app
Change a deployed schema without breaking existing data: stage the schema change, install @convex-dev/migrations, write a backfill that makes old rows valid, run it, and verify before tightening the validator.
## Steps
1. Make the new field optional first (so deploy doesn't reject existing rows).
2. Install @convex-dev/migrations; write a migration that backfills/transforms existing rows.
3. Run the migration; verify all rows are valid.
4. Tighten the validator (make the field required) once the backfill is complete.
## Rules
- Never tighten a validator before the backfill completes — it rejects existing rows and breaks the live app.
- Add new fields as optional first, migrate, then require.
- Verify row counts before and after.
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