import { Notification } from './notification.entity';
export type QueueStatus = 'queued' | 'processing' | 'sent' | 'failed' | 'retrying';
export type NotificationChannel = 'email' | 'push' | 'in_app' | 'sms' | 'whatsapp';
export declare class NotificationQueue {
    id: string;
    notification_id: string;
    notification: Notification;
    channel: NotificationChannel;
    scheduled_for: Date;
    priority_value: number;
    attempts: number;
    max_attempts: number;
    status: QueueStatus;
    last_attempt_at: Date | null;
    next_retry_at: Date | null;
    completed_at: Date | null;
    error_message: string | null;
    error_count: number;
    metadata: Record<string, any>;
    created_at: Date;
}