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interface QueueStatus {
  pending: number;      // Emails waiting
  sent: number;         // Successfully delivered
  failed: number;       // Errors
  sentCountThisHour: number;
  limit: number;        // MAX_EMAILS_PER_HOUR
}

interface Campaign {
  id: string;
  name: string;          // Internal campaign name
  subject: string;
  content: string;       // HTML content
  status: 'Draft' | 'Scheduled' | 'Sent' | 'Testing';
  recipientType: 'all' | 'subscribed' | 'list';
  listId?: string;
  recipientCount: number;
  createdAt: string;
  sentAt?: string;
  scheduledAt?: string;
  testEmail?: string;
  metrics: {
    sent: number;
    opened: number;
    clicked: number;
    bounced: number;
  };
}