ORM patterns for NestJS: TypeORM, Prisma, Mongoose. Covers entities, repositories, transactions, migrations, common pitfalls (N+1, cascade deletes, transaction boundaries).
Use this skill to:
- Detect which ORM the project uses and apply matching patterns.
- Define entities/schemas with the right decorators.
- Inject repositories or Prisma client correctly.
- Run transactions at the service boundary.
- Write migrations that round-trip cleanly.
Do NOT use this skill for:
- Module/DI patterns (see nest-conventions).
- Decorator usage broadly (see decorator-patterns).
- Non-ORM raw SQL (rare; flag in BLOCKERS if needed).
