migration-writer
Write safe, reversible database migrations for this repo's conventions. Use for any schema change.
Source facts
- Repository
- Archive228/loopkit
- Last source activity
- June 29, 2026 at 21:52
- Detected SKILL.md language
- English
- Stars
- 757
- Forks
- 124
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Source instructions · Read-only preview- name
- migration-writer
- description
- Write safe, reversible database migrations for this repo's conventions. Use for any schema change.
- when_to_use
- add/alter a table, column, index, or constraint
# 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.
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