import * as plugins from '../dist_ts/plugins.js';
/**
 * Lifts every persisted resource from one attachment subject to the attachment set, so a resource
 * can be attached to several conversations at once.
 *
 * One-way: a controller older than this build rejects a lifted document, so the upgrade cannot be
 * rolled back once it has run.
 */
export declare class ResourceAttachmentSetV31Migration {
    private readonly database;
    constructor(database: plugins.smartdata.SmartdataDb | undefined);
    run(): Promise<void>;
}