/**
 * Transaction service handles transaction lifecycle management.
 */
import { ServiceContext } from './service-context';
import { Transaction } from '../transaction';
import { TransactionInfo } from '../types';
/**
 * Transaction service for managing database transactions.
 */
export declare class TransactionService {
    private ctx;
    constructor(ctx: ServiceContext);
    /**
     * Start a new transaction.
     */
    beginTransaction(graphName: string, readOnly?: boolean, timeout?: number): Promise<Transaction>;
    /**
     * Commit a transaction.
     */
    commit(transactionId: number): Promise<boolean>;
    /**
     * Rollback a transaction.
     */
    rollback(transactionId: number): Promise<boolean>;
    /**
     * Return active transactions for the current session.
     */
    listTransactions(): Promise<TransactionInfo[]>;
    /**
     * Execute a function within a transaction.
     */
    withTransaction<T>(graphName: string, fn: (txId: number) => Promise<T>, readOnly?: boolean): Promise<T>;
}