import { OnApplicationBootstrap } from '@nestjs/common';
import { Pool } from 'pg';
import { Logger } from 'pino-nestjs';
import { MailService } from "../modules/mail/mail.service";
export declare class DatabaseModule implements OnApplicationBootstrap {
    private readonly pool;
    private readonly logger;
    private readonly mailService;
    private readonly breaker;
    constructor(pool: Pool, logger: Logger, mailService: MailService);
    onApplicationBootstrap(): Promise<void>;
    private sendGiveUpAlert;
    private ping;
}