import { type ProductNotification } from '@xopcai/gateway-contract';
export type NotificationDelivery = {
    event: ProductNotification;
    deviceId: string;
    pushToken: string;
    locale: 'en' | 'zh';
    attempts: number;
    providerTicketId?: string;
};
export declare function createNotificationEvent(input: {
    dedupeKey: string;
    notification: Omit<ProductNotification, 'id' | 'createdAt' | 'schemaVersion'>;
    deviceIds: string[];
    createdAt?: number;
}): {
    notification: ProductNotification;
    created: boolean;
};
export declare function listNotificationEvents(options?: {
    afterId?: string;
    since?: number;
    limit?: number;
}): {
    items: ProductNotification[];
    nextCursor: string | null;
};
export declare function acknowledgeNotification(eventId: string, consumerId: string, surface: 'web' | 'electron' | 'mobile'): boolean;
export declare function listDueNotificationDeliveries(status: 'pending' | 'accepted', now?: number, limit?: number): NotificationDelivery[];
export declare function markNotificationDeliveryAccepted(eventId: string, deviceId: string, ticketId: string, receiptAt: number): void;
export declare function markNotificationDeliveryDelivered(eventId: string, deviceId: string): void;
export declare function markNotificationDeliveryDead(eventId: string, deviceId: string, error: string): void;
export declare function rescheduleNotificationDelivery(eventId: string, deviceId: string, status: 'pending' | 'accepted', nextAttemptAt: number, error: string): void;
export declare function notificationDeliveryMetrics(): {
    pending: number;
    accepted: number;
    delivered: number;
    dead: number;
    due: number;
    devices: {
        deliverable: number;
        expired: number;
        disabled: number;
    };
    oldestPendingAt: number | null;
    latestError: {
        eventId: string;
        deviceId: string;
        message: string;
        updatedAt: number;
    } | null;
};
export declare function expireUndeliverableNotificationDeliveries(now?: number): number;
export declare function pruneNotificationEvents(before: number): number;