import type { AgendaBackend, JobRepository, NotificationChannel, JobLogger } from 'agenda';
import type { PostgresBackendConfig } from './types.js';
/**
 * PostgreSQL backend for Agenda
 *
 * Provides both storage (via PostgresJobRepository) and real-time notifications
 * (via PostgresNotificationChannel using LISTEN/NOTIFY).
 *
 * @example
 * ```typescript
 * import { Agenda } from 'agenda';
 * import { PostgresBackend } from '@agendajs/postgres-backend';
 *
 * // Using connection string
 * const agenda = new Agenda({
 *   backend: new PostgresBackend({
 *     connectionString: 'postgresql://user:pass@localhost:5432/mydb'
 *   })
 * });
 *
 * // Or using an existing pool (e.g., shared with your app)
 * // The pool will NOT be closed when Agenda disconnects
 * import { Pool } from 'pg';
 * const pool = new Pool({ connectionString: '...' });
 *
 * const agenda = new Agenda({
 *   backend: new PostgresBackend({ pool })
 * });
 *
 * // Your app can continue using the pool after agenda.stop()
 *
 * agenda.define('myJob', async (job) => {
 *   console.log('Running job:', job.attrs.name);
 * });
 *
 * await agenda.start();
 * await agenda.every('5 minutes', 'myJob');
 * ```
 */
export declare class PostgresBackend implements AgendaBackend {
    readonly name = "PostgreSQL";
    private _repository;
    private _notificationChannel?;
    private _logger;
    private config;
    private _ownsConnection;
    constructor(config: PostgresBackendConfig);
    /**
     * The job repository for storage operations
     */
    get repository(): JobRepository;
    /**
     * Whether this backend owns its database connection.
     * True if created from connectionString/poolConfig, false if pool was passed in.
     */
    get ownsConnection(): boolean;
    /**
     * The job logger for persistent event logging.
     * Always available; Agenda decides whether to activate it via its `logging` config.
     */
    get logger(): JobLogger;
    /**
     * The notification channel for real-time notifications via LISTEN/NOTIFY
     * Returns undefined if notifications are disabled
     */
    get notificationChannel(): NotificationChannel | undefined;
    /**
     * Connect to PostgreSQL
     *
     * - Establishes database connection pool
     * - Creates table and indexes if ensureSchema is true
     * - Sets up LISTEN for real-time notifications
     */
    connect(): Promise<void>;
    /**
     * Disconnect from PostgreSQL
     *
     * - Stops LISTEN on notification channel
     * - Closes database connection pool
     */
    disconnect(): Promise<void>;
}