/**
 * Migration 049: Add user_preferred_language column to settings.
 *
 * Stores the user's preferred UI language as an ISO 639-1 code.
 * Defaults to 'en' (English) for backward compatibility with
 * existing installations.
 *
 * Supported values: en, ru, pt, es, ar, he, fr, de
 */
import type { MigrationParams } from 'umzug';
import type Database from 'better-sqlite3';
export declare function up({ context: db }: MigrationParams<Database.Database>): Promise<void>;
export declare function down({ context: db }: MigrationParams<Database.Database>): Promise<void>;
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