# Database

## Setup

PostgreSQL 16. Two databases:

| Database | Port | Usage |
|----------|------|-------|
| `lunarfront` | 5432 | Development |
| `lunarfront_api_test` | 5432 | API integration tests (auto-created by test runner) |

## Migrations

Migrations are managed by Drizzle Kit and live in `packages/backend/src/db/migrations/`.

```bash
cd packages/backend

# Generate a migration from schema changes
bunx drizzle-kit generate

# Apply pending migrations
bunx drizzle-kit migrate
```

Schema files: `packages/backend/src/db/schema/`

## Multi-Tenancy

All domain tables include `company_id` (uuid FK to `company`). Every query filters by the authenticated user's company. Location-scoped tables additionally include `location_id`.

## Schema Overview

### Core

| Table | Description |
|-------|-------------|
| `company` | Tenant (tenant business) |
| `location` | Physical store location |
| `user` | Staff/admin user account |

### Accounts & Members

| Table | Description |
|-------|-------------|
| `account` | Billing entity (family, individual, business) |
| `member` | Individual person on an account |
| `member_identifier` | ID documents (DL, passport, school ID) |
| `payment_method` | Stored payment methods |
| `processor_link` | Payment processor integrations |
| `tax_exemption` | Tax exemption records |

### Inventory

| Table | Description |
|-------|-------------|
| `product` | Product catalog entry |
| `inventory_unit` | Individual serialized/non-serialized unit |
| `stock_receipt` | Incoming stock records |
| `category` | Product categories |
| `supplier` | Product suppliers |
| `inventory_unit_status` | Lookup: unit statuses |
| `item_condition` | Lookup: item conditions |

### RBAC

| Table | Description |
|-------|-------------|
| `permission` | System permissions (global, seeded) |
| `role` | Company-scoped roles (system + custom) |
| `role_permission` | Role-to-permission mapping |
| `user_role_assignment` | User-to-role mapping |

### Files

| Table | Description |
|-------|-------------|
| `file` | File metadata (path, type, size, entity reference) |

## Key Conventions

- UUIDs for all primary keys (`defaultRandom()`)
- `created_at` and `updated_at` timestamps with timezone on all tables
- Soft deletes via `is_active` boolean where applicable
- Auto-generated sequential numbers: `account_number` (6-digit), `member_number`
- Lookup tables support both system (immutable) and custom (company-scoped) values
