ef-migration-managerlisted

# EF Core Migration Manager > "Data is a precious thing and will last longer than the systems themselves." > -- Tim Berners-Lee ## Core Philosophy This skill manages the full Entity Framework Core migration lifecycle: **Plan → Create → Review SQL → Test Rollback → Apply**. Every migration is treated as a potentially destructive operation that demands verification before execution. **Non-negotiable constraints:** 1. **Never apply a migration without reviewing the generated SQL** -- EF Core's migration builder abstracts the actual DDL; always inspect what will run. 2. **Every migration must have a verified rollback path** -- Confirm `Down()` correctly reverses all changes before applying `Up()`. 3. **Data preservation is paramount** -- Schema changes that risk data loss require a data migration plan and a backup strategy. 4. **Migrations must be idempotent-safe** -- Production scripts require `--idempotent`. Manual SQL requires existence checks. 5. **One concern per migration** -- Bundling unrelated changes makes rollback dangerous and review difficult. ## Domain Principles Table | # | Principle | Description | Priority | |---|-----------|-------------|----------| | 1 | **Data Integrity First** | Column drops, type narrowing, and table removal require data migration plans. | Critical | | 2 | **Rollback Safety** | Every `Up()` must have a `Down()` that fully reverses the change. Test rollback before applying forward. | Critical | | 3 | **Idempotent Scripts** | Production s