import { Logger } from '@n8n/backend-common';
import { GlobalConfig, WorkflowHistoryCompactionConfig } from '@n8n/config';
import { DbConnection, WorkflowHistoryRepository } from '@n8n/db';
import { InstanceSettings } from 'n8n-core';
import { EventService } from '../../events/event.service';
export declare function getCompactionWindowDeltas(minimumAge: number, timeWindow: number, unitMs: number): {
    startDelta: number;
    endDelta: number;
};
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 isOptimizingHistories;
    private isTrimmingHistories;
    private startupAbort;
    constructor(config: WorkflowHistoryCompactionConfig, globalConfig: GlobalConfig, logger: Logger, instanceSettings: InstanceSettings, dbConnection: DbConnection, workflowHistoryRepository: WorkflowHistoryRepository, eventService: EventService);
    init(): void;
    get isEnabled(): boolean;
    get isTrimmingEnabled(): boolean;
    runStartupCompaction(): void;
    stopStartupCompaction(): void;
    trimLongRunningHistories(signal: AbortSignal): Promise<void>;
    optimizeHistories(signal: AbortSignal): Promise<void>;
    private compactHistories;
    private waitBetweenBatches;
}