/**
 * @param hint Account name caller truyền vào. Nếu live → dùng. Nếu kh cooldown → fallback.
 */
export declare function pickAccount(provider: string, hint?: string): string;
export declare function markCooldown(provider: string, account: string, opts?: {
    retryAfterSec?: number;
    durationMs?: number;
}): void;
export declare function clearCooldown(provider: string, account: string): void;
export declare function listCooldowns(): Array<{
    provider: string;
    account: string;
    until: number;
}>;