import { EventService } from '../../events/event.service';
import { Logger } from '@n8n/backend-common';
import { GlobalConfig, WorkflowHistoryCompactionConfig } from '@n8n/config';
import { DbConnection, WorkflowHistoryRepository } from '@n8n/db';
import { InstanceSettings } from 'n8n-core';
export declare class WorkflowHistoryCompactionService {
    private readonly config;
    private readonly globalConfig;
    private readonly logger;
    private readonly instanceSettings;
    private readonly dbConnection;
    private readonly workflowHistoryRepository;
    private readonly eventService;
    private optimizingInterval;
    private trimmingInterval;
    private isShuttingDown;
    private isOptimizingHistories;
    private isTrimmingHistories;
    constructor(config: WorkflowHistoryCompactionConfig, globalConfig: GlobalConfig, logger: Logger, instanceSettings: InstanceSettings, dbConnection: DbConnection, workflowHistoryRepository: WorkflowHistoryRepository, eventService: EventService);
    init(): void;
    get isEnabled(): boolean;
    startCompacting(): void;
    stopCompacting(): void;
    private scheduleTrimming;
    private scheduleOptimization;
    shutdown(): void;
    private trimLongRunningHistories;
    private optimizeHistories;
    private compactHistories;
}