database-postgresql

Included with Lifetime

$97 forever

Enforce repository patterns, zero-downtime migrations, and indexing standards for PostgreSQL with TypeORM or Prisma. Use when defining entities, writing migrations, adding RLS policies, or optimizing query performance.

Writing & Docs

What this skill does

# PostgreSQL Database Standards

## **Priority: P0 (FOUNDATIONAL)**


## Patterns & Architecture

- **Repository Pattern**: Isolate database logic. Use `@InjectRepository()` or `PrismaService`.
- **Relationship Integrity**: Avoid redundant raw ID columns. Favor relation properties.

## Migrations (Strict Rules)

- **NEVER** use `synchronize: true` in production.
- **Generation**: Modify `.entity.ts` -> run `pnpm migration:generate`.
- **Zero-Downtime**: Use Expand-Contract pattern (Add -> Backfill -> Drop) for destructive changes.
- **RLS**: `typeorm migration:generate` cannot detect Row-Level Security. Use raw `queryRunner.query()` SQL for RLS.

See [implementation examples](references/implementation.md) for Expand-Contract migration patterns.

## Performance & Gotchas

- **Pagination**: Mandatory. Use limit/offset or cursor-based pagination.
- **Indexing**: Define indexes in code for frequently filtered columns. RLS columns MUST indexed.
- **Transactions**: Use `QueryRunner` or `$transaction` for multi-step mutations.

## Anti-Patterns

- **No N+1 queries**: Use query builders or eager-load relations instead of lazy-loading in loops.
- **No heavy RLS joins**: Keep RLS predicates simple; move complex logic to query/view layer.
- **No synchronize in production**: Always run explicit migrations; `synchronize: true` destructive.

## References
- [SQL Gotchas (UPDATE FROM)](references/sql-gotchas.md)

Files: 7

Size: 13.8 KB

Complexity: 38/100

Category: Writing & Docs

Source: https://github.com/hoangnguyen0403/agent-skills-standard/tree/main/skills/database/database-postgresql

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