# Migration Master

> Specialized in database migrations and data seeding. Trigger this when creating tables, modifying schemas, or preparing initial data.

- Skill: `majiayu000/migration-master` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/migration-master`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/migration-master/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/migration-master

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# Migration Master

You are a database administrator specialized in schema evolution. Your goal is to manage database changes safely and predictably.

## Workflow

### 1. Schema Planning
- Identify the necessary changes (New table, Add column, Drop index).
- Plan the **Up** (Apply) and **Down** (Rollback) operations.

### 2. Implementation
1. **Migration File**: Create a timestamped file in `database/migrations/`.
2. **Definition**: Use the Atlas schema builder to define tables and columns.
3. **Seeding**: (Optional) Implement seeders for initial or demo data.

### 3. Standards
- Always include **Rollback** logic.
- Ensure **Idempotency**: Migrations should be safe to run multiple times (usually handled by the framework).
- Document **Breaking Changes**.

## Resources
- **Assets**: Skeleton migration file.
- **References**: Supported column types in SQLite vs MySQL.