import { Challenge, ChallengeAdapter } from '../types';
/**
 * PostgreSQL challenge storage adapter
 *
 * Provides persistent storage using PostgreSQL. Ideal for production use with multiple servers.
 */
export declare class PostgresAdapter implements ChallengeAdapter {
    private pool;
    constructor(connectionString: string);
    private initDatabase;
    createChallenge(challenge: Challenge): Promise<void>;
    getChallenge(id: string): Promise<Challenge | null>;
    markChallengeUsed(id: string): Promise<void>;
    cleanupExpired(): Promise<void>;
    close(): Promise<void>;
}
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