/**
 * Database backup and maintenance utilities
 *
 * Provides backup, vacuum, and rotation functionality for SQLite database.
 */
import type Database from "better-sqlite3-multiple-ciphers";
/**
 * Get the backup directory path
 */
export declare function getBackupDir(workspaceRoot?: string): string;
/**
 * Generate timestamped backup filename (format: memory-YYYYMMDD.sqlite)
 */
export declare function generateBackupFilename(date?: Date): string;
/**
 * Rotate backups, keeping only the N most recent
 */
export declare function rotateBackups(backupDir: string, maxBackups?: number): void;
/**
 * Backup database to timestamped file with optional rotation
 *
 * @param dbPath - Path to the source database file
 * @param rotate - Number of backups to keep (default: 7, 0 = no rotation)
 * @param workspaceRoot - Optional workspace root override
 * @returns Path to the created backup file
 */
export declare function backupDatabase(dbPath: string, rotate?: number, workspaceRoot?: string): string;
/**
 * Vacuum (optimize) the database
 *
 * This command rebuilds the database file, repacking it into a minimal amount
 * of disk space and improving query performance.
 *
 * @param db - Database instance
 */
export declare function vacuumDatabase(db: Database.Database): void;
/**
 * Get backup retention count from environment variable
 */
export declare function getBackupRetention(): number;