import type { DatabaseSync } from "node:sqlite";
export interface RebuildLease {
    holder: string;
    generation: number;
}
/**
 * 尝试获取 rebuild lease；失败抛 lease-held / db-busy。
 */
export declare function tryAcquireRebuildLease(db: DatabaseSync, holder?: string): RebuildLease;
/**
 * 释放 lease（仅 holder 匹配时）。
 */
export declare function releaseRebuildLease(db: DatabaseSync, holder: string): void;
/**
 * 当前是否有未过期 lease。
 */
export declare function isLeaseHeld(db: DatabaseSync): boolean;
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