import { Logger } from '@n8n/backend-common';
import { DatabaseConfig } from '@n8n/config';
import { ErrorReporter } from 'n8n-core';
import { DbConnectionMetrics } from './db-connection-metrics';
import { DbConnectionOptions } from './db-connection-options';
import { type DbPoolStats } from './db-pool-stats';
type ConnectionState = {
    connected: boolean;
    migrated: boolean;
};
export declare class DbConnection {
    private readonly errorReporter;
    private readonly connectionOptions;
    private readonly databaseConfig;
    private readonly logger;
    private readonly dbConnectionMetrics;
    private dataSource;
    private monitor;
    readonly connectionState: ConnectionState;
    constructor(errorReporter: ErrorReporter, connectionOptions: DbConnectionOptions, databaseConfig: DatabaseConfig, logger: Logger, dbConnectionMetrics: DbConnectionMetrics);
    get options(): import("@n8n/typeorm").DataSourceOptions;
    getPoolStats(): DbPoolStats | undefined;
    getDbVersion(): Promise<string | null>;
    init(): Promise<void>;
    private warnOnUnsupportedPostgresVersion;
    migrate(): Promise<void>;
    private migrateWithAdvisoryLock;
    close(): Promise<void>;
    private connectWithRetry;
}
export {};