/**
 * Database Backup Manager
 *
 * Manages database backups for migration safety.
 */
import type { DatabaseClient } from '../../db/client.js';
/**
 * Backup result
 */
export interface DbBackupResult {
    /** Whether backup was successful */
    success: boolean;
    /** Path to backup file */
    backupPath?: string;
    /** Size of backup in bytes */
    size?: number;
    /** Error message if failed */
    error?: string;
}
/**
 * Database backup manager
 *
 * Creates and manages backups of the SQLite database for migration safety.
 */
export declare class DbBackupManager {
    private db;
    private projectRoot;
    private readonly BACKUP_DIR;
    private readonly KEEP_BACKUPS;
    constructor(db: DatabaseClient, projectRoot: string);
    /**
     * Create a backup of the database
     *
     * @returns Backup result
     */
    createBackup(): Promise<DbBackupResult>;
    /**
     * List all database backups
     *
     * @returns Array of backup file names
     */
    listBackups(): Promise<string[]>;
    /**
     * Restore from a backup
     *
     * @param backupFileName - Name of backup file to restore
     * @returns True if restore was successful
     */
    restoreFromBackup(backupFileName: string): Promise<boolean>;
    /**
     * Clean up old backups (keep last 5)
     */
    private cleanupOldBackups;
}
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