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zero-downtime-migration-planner

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Plans blue-green rollouts, canary deployments, and expand-and-contract schema migrations with zero downtime.

skills/architecture/zero-downtime-migration-planner/SKILL.md

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## Purpose

Formulate zero-downtime deployment and database migration blueprints (Expand/Contract pattern, Parallel Run, Blue-Green, Canary) allowing continuous availability during breaking changes.

## When to Use

- Renaming or splitting database columns in high-traffic tables.
- Replacing a core microservice or authentication provider without maintenance windows.
- Executing major database engine upgrades with replication cutovers.

## What to Analyze

1. **Expand & Contract Phases**:
   - *Phase 1 (Expand)*: Add new nullable column/table alongside old one.