import { DatabaseSync } from 'node:sqlite';
import { type JSONCodecReadSecretOptions } from '../tools/json-codec.js';
export declare class DatabaseService {
    readonly db: DatabaseSync;
    constructor();
    transaction<T>(fn: () => T): T;
    encode(value: unknown): Promise<string | null>;
    decode(text: string | null, options?: JSONCodecReadSecretOptions): Promise<unknown>;
    close(): void;
}