/**
 * Lemma Cloud — API Key Manager
 *
 * Handles key generation, validation, usage tracking, and plan enforcement.
 * Uses a JSON file as storage (swap for Redis/Postgres in production).
 */
import { ApiKey } from './types';
export declare class KeyManager {
    private keys;
    private storePath;
    private saveTimer;
    constructor(storePath?: string);
    generate(tenantId: string, name: string, plan?: ApiKey['plan']): ApiKey;
    validate(keyId: string): {
        valid: boolean;
        key?: ApiKey;
        reason?: string;
    };
    recordRequest(keyId: string): void;
    upgradePlan(keyId: string, plan: ApiKey['plan']): boolean;
    revoke(keyId: string): boolean;
    getByTenant(tenantId: string): ApiKey[];
    get(keyId: string): ApiKey | undefined;
    private maybeResetDaily;
    private maybeResetMonthly;
    private scheduleSave;
    private save;
    private load;
}
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