Message Queues

Schedule Request
    │
    ▼
┌─────────────────────┐
│ SQS_QUEUE_SCHEDULES │  ← Email scheduling
└─────────┬───────────┘
          │
          ▼
    Batch Processing
    (group into batches)
          │
          ▼
┌─────────────────────────┐
│ SQS_QUEUE_EMAIL_ANALYTICS│  ← Delivery + tracking
└─────────┬───────────────┘
          │
          ▼
    SendGrid API
          │
          ▼
    Delivery Events
    (opens, clicks, bounces)
          │
          ▼
┌─────────────────────────┐
│ SQS_QUEUE_WEBHOOK_EVENTS │  ← Event processing
└─────────────────────────┘

@SqsMessageHandler(/* queue name */)
async handleMessage(message: SQS.Message): Promise<void> {
  // Process message
  // Auto-delete on success
  // DLQ on failure
}