Migration Writer

Write safe, reversible database migrations for this repo's conventions. Use for any schema change.

archive228 ec2a1a8 759 B Updated

File contents

Migration Writer

  1. Read the current schema first. Match the repo's migration tool and naming (NNN_<verb>_<noun>).
  2. Write BOTH up and down. A migration you can't reverse is a migration you can't deploy safely.
  3. Live-safe: on a hot table, adding a NOT NULL column with no default, or an index without CONCURRENTLY, takes a blocking lock. Split into steps: add nullable → backfill → add constraint.
  4. Backfill large tables in batches, not one statement.
  5. Never edit an already-merged migration — add a new one. Test with a dry-run before committing. Output the migration + the exact deploy order.

archive228/loopkit/tree/main/skills/migration-writer commit ec2a1a8319

Frequently asked questions

npx skillmds@latest add archive228/migration-writer