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document production migrations

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Yisroel Baum 2026-07-31 10:55:26 +03:00
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ai/backend-context.md
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@ -40,11 +40,14 @@ intentionally omitted here - update this section as entities land.
## Migrations
- This project is not in production. By default, schema changes should update
the relevant create-table migration so migrations describe the current desired
schema from scratch.
- Do not add alter-table or data-backfill migrations unless the user explicitly
asks for production-style migration safety.
- This project is in production. Never edit, delete, rename, or reorder an
existing migration file. Every schema change must use a new forward
migration.
- Production migrations must preserve existing data, include any required
backfill, and define a safe rollback.
- Plan schema changes for the deployment order and for compatibility between
the old and new application versions. Use expand/backfill/contract sequencing
when a single compatible migration is not safe.
- Put seed data in seeders, not migrations.
## PHP rules