import type { Database } from 'better-sqlite3';
/**
 * Interface representing a versioned database schema migration.
 */
export interface Migration {
    /**
     * Unique, strictly incrementing version number starting at 1.
     */
    readonly version: number;
    /**
     * Descriptive name of the migration in kebab-case.
     */
    readonly name: string;
    /**
     * Applies the migration steps to the database.
     */
    up(db: Database): void;
}
/**
 * Helper to add a column idempotently.
 */
export declare function addColumnIfNotExists(db: Database, table: string, columnDef: string, columnName: string): void;
//# sourceMappingURL=migration.d.ts.map