# Pattern: Repository

## Responsibility

Persistence only. Parameterized SQL. Map rows ↔ model.

## Shape

```go
func (r *ReportRepository) SaveReport(ctx context.Context, m *model.Report) error {
    const q = `INSERT INTO report (id, user_id, kind, payload, created_at, updated_at)
               VALUES ($1,$2,$3,$4,now(),now())`
    _, err := r.db.ExecContext(ctx, q, m.ID, m.UserID, m.Kind, m.Payload)
    if err != nil {
        return fmt.Errorf("insert report: %w", err)
    }
    return nil
}
```

## Never

- `SELECT *` in new code
- Business policy (VIP checks) here — return data, let service decide