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Magnus HedemarkandGitHub
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Engineering: backend-engineering, frontend-engineering, data-engineering, ml-engineering, platform-engineering, qa-methodology Executive: go-to-market, legal-strategy, operational-design, org-design, product-strategy ml-engineering: added missing training-infrastructure.md reference qa-methodology: added test-data-management, performance-testing, security-testing references All frontmatter converted to agent-skills convention. Source: https://github.com/magnus919/hermes-profiles
1.1 KiB
1.1 KiB
Database Migrations
Migration Types
| Type | Risk | Rollback | Example |
|---|---|---|---|
| Add column (nullable) | Low | Trivial | ALTER TABLE ADD COLUMN x TEXT |
| Add column (NOT NULL) | Medium | Trivial if default provided | ALTER TABLE ADD COLUMN x INT NOT NULL DEFAULT 0 |
| Rename column | High | Requires migration | Two-phase: add new, dual-write, backfill, drop old |
| Drop column | High | Requires restore | Verify no readers first, soft-delete before hard-drop |
| Create table | Low | Trivial | CREATE TABLE |
| Drop table | Critical | Requires restore | Verify no readers, triply confirm |
| Data migration | High | Requires rollback script | Transform values, update references |
Migration Checklist
- Migration reviewed by another engineer
- Rollback script exists and is tested
- Downtime window confirmed (if required)
- Read replicas considered (replication lag)
- Foreign key constraints handled
- Indexes created after data load (not before)
- Migration tested against copy of production data
- Query performance verified post-migration