# Database Models

Changemaker Lite V2 uses a comprehensive PostgreSQL database schema with 30+ models across authentication, campaigns, locations, media, and content management. The schema is managed via Prisma ORM (main API) and Drizzle ORM (media API).

## Model Organization

Models are organized by feature area:

### [Authentication & Users](auth.md)

Core authentication and user management:

- **User** - User accounts with roles and authentication
- **RefreshToken** - JWT refresh token tracking
- **Session** - User session management (future)

### [Influence Module](influence.md)

Advocacy campaign models:

- **Campaign** - Campaign definitions and settings
- **CampaignEmail** - Sent email tracking
- **Response** - Public response wall submissions
- **PostalCodeCache** - Representative lookup cache

### [Map Module](map.md)

Location and geographic models:

- **Location** - Address database with geocoding
- **Cut** - Geographic polygon organization
- **Shift** - Volunteer shift scheduling
- **MapSettings** - Map configuration singleton

### [Canvassing](canvass.md)

Door-to-door canvassing models:

- **CanvassSession** - Canvassing session tracking
- **CanvassVisit** - Visit outcome recording
- **TrackingSession** - GPS tracking (future)

### [Content Management](pages.md)

Landing pages and content:

- **Page** - Landing page definitions
- **PageBlock** - Reusable content blocks

### [Email Templates](email-templates.md)

Email template system:

- **EmailTemplate** - Template definitions
- **EmailTemplateVersion** - Version history (future)

### [Media](media.md)

Video library (Drizzle ORM):

- **videos** - Video metadata and files
- **shared_media** - Public gallery assignments
- **media_reactions** - Emoji reactions
- **media_jobs** - Background job queue

### [Settings](settings.md)

Global configuration:

- **Settings** - Site-wide settings singleton

## ORM Architecture

### Prisma (Main API)

Used for 95% of models:

- **Schema:** `api/prisma/schema.prisma`
- **Migrations:** `api/prisma/migrations/`
- **Client:** Auto-generated TypeScript types
- **Database:** PostgreSQL 16

### Drizzle (Media API)

Used for media models only:

- **Schema:** `api/src/modules/media/db/schema.ts`
- **Migrations:** None (push-based)
- **Client:** Manual schema definition
- **Database:** Same PostgreSQL 16

## Common Patterns

### Timestamps

Most models include:

```prisma
createdAt DateTime @default(now())
updatedAt DateTime @updatedAt
```

### Foreign Keys

Relations use explicit foreign key fields:

```prisma
model Campaign {
  id              Int     @id @default(autoincrement())
  createdByUserId Int
  createdBy       User    @relation(fields: [createdByUserId], references: [id])
}
```

### JSON Fields

Flexible data stored as JSON:

```prisma
model Campaign {
  emailTemplate Json?
  settings      Json?
}
```

TypeScript types:

```typescript
import { Prisma } from '@prisma/client';

const template: Prisma.InputJsonValue = {
  subject: 'Email subject',
  body: 'Email body',
};
```

### Enums

Type-safe enumerations:

```prisma
enum Role {
  SUPER_ADMIN
  INFLUENCE_ADMIN
  MAP_ADMIN
  USER
  TEMP
}

enum VisitOutcome {
  SUCCESS
  NOT_HOME
  MOVED
  REFUSED
  WRONG_ADDRESS
  INACCESSIBLE
  OTHER
}
```

## Model Count by Category

| Category | Models | ORM |
|----------|--------|-----|
| Authentication | 3 | Prisma |
| Influence | 4 | Prisma |
| Map | 4 | Prisma |
| Canvassing | 3 | Prisma |
| Content | 2 | Prisma |
| Email Templates | 2 | Prisma |
| Media | 4 | Drizzle |
| Settings | 2 | Prisma |
| **Total** | **24** | Mixed |

## Database Operations

### Migrations (Prisma)

```bash
# Create migration
cd api && npx prisma migrate dev --name add_field

# Deploy migrations
cd api && npx prisma migrate deploy

# Reset database (dev only)
cd api && npx prisma migrate reset
```

### Schema Push (Drizzle)

```bash
# Push schema changes (media API)
cd api && npx drizzle-kit push
```

### Database Browser

View data via:

- **Prisma Studio:** `npx prisma studio`
- **NocoDB:** http://localhost:8091 (read-only)

## Indexes

Key indexes for performance:

```prisma
model Location {
  @@index([cutId])
  @@index([lastVisitedAt])
}

model Campaign {
  @@index([published])
  @@index([createdByUserId])
}

model CanvassSession {
  @@index([userId])
  @@index([status])
}
```

## Constraints

### Unique Constraints

```prisma
model User {
  email String @unique
}

model Page {
  slug String @unique
}

model Cut {
  name String @unique
}
```

### Check Constraints

Enforced at application level:

- Email format validation
- Password complexity (12+ chars)
- Coordinate bounds (-90 to 90 lat, -180 to 180 lng)

## Relations

### One-to-Many

```prisma
model User {
  id        Int        @id @default(autoincrement())
  campaigns Campaign[]
}

model Campaign {
  id              Int  @id @default(autoincrement())
  createdByUserId Int
  createdBy       User @relation(fields: [createdByUserId], references: [id])
}
```

### Many-to-Many

Via junction tables:

```prisma
model Shift {
  id      Int            @id @default(autoincrement())
  signups ShiftSignup[]
}

model User {
  id      Int            @id @default(autoincrement())
  signups ShiftSignup[]
}

model ShiftSignup {
  id      Int   @id @default(autoincrement())
  shiftId Int
  userId  Int
  shift   Shift @relation(fields: [shiftId], references: [id])
  user    User  @relation(fields: [userId], references: [id])

  @@unique([shiftId, userId])
}
```

## Seeding

Initial data in `api/prisma/seed.ts`:

- Admin user (admin@example.com)
- Default settings
- Sample page blocks
- System email templates

```bash
# Run seed
cd api && npx prisma db seed
```

## Data Types

### Common Types

- **ID:** `Int @id @default(autoincrement())`
- **String:** `String` or `String @db.Text` (long text)
- **Number:** `Int` or `Float`
- **Boolean:** `Boolean @default(false)`
- **Date:** `DateTime @default(now())`
- **JSON:** `Json` or `Json?`
- **Enum:** `Role`, `VisitOutcome`, etc.

### Spatial Data

GeoJSON stored as JSON:

```prisma
model Cut {
  geometry Json  // GeoJSON Polygon
}
```

Coordinates as separate fields:

```prisma
model Location {
  latitude  Float
  longitude Float
}
```

## Database Configuration

### Connection String

```bash
DATABASE_URL="postgresql://user:password@localhost:5432/changemaker_v2?schema=public"
```

### Connection Pool

Prisma connection pool:

```typescript
// api/src/server.ts
const prisma = new PrismaClient({
  log: ['error', 'warn'],
});
```

## Related Documentation

- [Authentication Models](auth.md)
- [Influence Models](influence.md)
- [Map Models](map.md)
- [Canvassing Models](canvass.md)
- [Content Models](pages.md)
- [Email Template Models](email-templates.md)
- [Media Models](media.md)
- [Settings Models](settings.md)
- [Database Overview](../index.md)
- [Migrations Guide](../../development/migrations.md)
- [Backend Modules](../../backend/modules/index.md)