import { Repository } from 'typeorm';
import { SecurityAlertAckEntity } from '../entities/security-alert-ack.entity';
export declare class SecurityAlertAckService {
    private readonly repo;
    private readonly logger;
    constructor(repo: Repository<SecurityAlertAckEntity>);
    findByIds(ids: string[]): Promise<SecurityAlertAckEntity[]>;
    acknowledge(id: string, lastEventAt?: Date, acknowledgedBy?: string): Promise<SecurityAlertAckEntity>;
    acknowledgeAll(alerts: {
        id: string;
        timestamp?: Date;
    }[], acknowledgedBy?: string): Promise<void>;
    resetAcknowledgement(id: string, lastEventAt: Date): Promise<void>;
    updateLastEventAt(id: string, lastEventAt: Date): Promise<void>;
    cleanupStale(activeIds: string[]): Promise<void>;
}