/**
 * Migration Runner
 *
 * Core execution engine for database migrations.
 */
import type { DatabaseClient } from '../client.js';
import type { MigrationResult, MigrationStatus, MigrationOptions } from './types.js';
/**
 * Migration runner class
 */
export declare class MigrationRunner {
    private db;
    private projectRoot;
    constructor(db: DatabaseClient, projectRoot: string);
    /**
     * Get current migration status
     */
    getStatus(): Promise<MigrationStatus>;
    /**
     * Run pending migrations
     */
    migrate(options?: MigrationOptions): Promise<MigrationResult[]>;
    /**
     * Validate migration dependencies
     */
    private validateDependencies;
    /**
     * Apply a single migration
     */
    private applyMigration;
    /**
     * Record migration in schema_migrations table
     */
    private recordMigration;
    /**
     * Update legacy schema_version table
     */
    private updateSchemaVersion;
    /**
     * Create backup before migration
     */
    private createBackup;
    /**
     * Clean up old migration backups (keep last 5)
     */
    private cleanupOldBackups;
    /**
     * Get migration backups
     */
    getMigrationBackups(): Promise<string[]>;
    /**
     * Get raw database instance
     */
    private getDb;
}
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