Notification Architecture

@Injectable()
export class NotificationService {
  async notify(recipientId: string, type: NotificationType, data: any) {
    // 1. Check user preferences
    const prefs = await this.getPreferences(recipientId);

    // 2. Create in-app notification
    if (prefs.inApp) {
      await this.createInAppNotification(recipientId, type, data);
    }

    // 3. Send email
    if (prefs.email) {
      await this.emailQueue.add("notify", { recipientId, type, data });
    }

    // 4. Push via WebSocket
    if (prefs.push) {
      this.wsGateway.sendToUser(recipientId, "notification", { type, data });
    }
  }
}

{
  "assignTask": { "inApp": true, "email": true, "push": true },
  "mention": { "inApp": true, "email": true, "push": true },
  "approval": { "inApp": true, "email": true, "push": false },
  "teams": { "inApp": true, "email": false, "push": false }
}