import type Database from "better-sqlite3";
/**
 * Back up the cache DB to `<cacheDir>/backups/cache-<timestamp>.db`, then prune
 * all but the newest THREADBASE_CACHE_BACKUP_RETAIN backups. Returns the path
 * of the backup just created.
 */
export declare function backupCacheDb(db: Database.Database, cacheDir: string): Promise<string>;
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