import type { DB } from '../db/client.js';
export type WindowType = 'free' | 'paid';
export interface MessageWindowOptions {
    db: DB;
    freeWindowExpr?: string;
    paidWindowExpr?: string;
}
export interface WindowStatus {
    inWindow: boolean;
    type: WindowType | null;
}
export interface OpenWindowRow {
    whatsapp: string;
    window_type: WindowType;
    end_time: string;
}
export declare class MessageWindow {
    readonly db: DB;
    readonly freeWindowExpr: string;
    readonly paidWindowExpr: string;
    constructor({ db, freeWindowExpr, paidWindowExpr, }: MessageWindowOptions);
    start(whatsapp: string, type?: WindowType): Promise<void>;
    status(whatsapp: string): Promise<WindowStatus>;
    listOpen({ limit }?: {
        limit?: number;
    }): Promise<OpenWindowRow[]>;
}
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