/**
 * Beam Shield — Wall 5: Audit Log
 * Records every external intent interaction for security monitoring.
 */
import type { Database } from 'better-sqlite3';
export interface AuditEvent {
    timestamp: string;
    senderBeamId: string;
    senderTrust: number;
    intentType: string;
    payloadHash: string;
    decision: 'pass' | 'hold' | 'reject';
    riskScore: number;
    responseSize: number;
    anomalyFlags: string[];
}
export declare function hashPayload(payload: unknown): string;
export declare function logShieldEvent(db: Database, event: AuditEvent): void;
export declare function getRecentEvents(db: Database, beamId: string, hours?: number): AuditEvent[];
export declare function getAuditStats(db: Database, hours?: number): {
    total: number;
    passed: number;
    held: number;
    rejected: number;
};