export declare const MAX_QUEUE_ATTEMPTS = 3;
export type TicketState = "pending" | "leased" | "running" | "verifying" | "retryable" | "parked" | "blocked" | "completed";
export type TicketResumeState = "pending" | "retryable";
export type TicketResumeGate = {
    kind: "time";
    role_id: null;
    engine: null;
    session_id: null;
    limited_session_version: null;
    limited_observation_id: null;
    limited_observed_at: null;
} | {
    kind: "quota";
    role_id: string;
    engine: "claude" | "codex";
    session_id: string;
    limited_session_version: number;
    limited_observation_id: string;
    limited_observed_at: string;
};
export interface QueueLifecycleFields {
    lifecycle_updated_at: string;
    lease_expires_at: string | null;
    resume_at: string | null;
    resume_state: TicketResumeState | null;
    park_reason: string | null;
    resume_gate: TicketResumeGate | null;
    session_id: string | null;
    last_error: string | null;
}
export declare function initialQueueLifecycle(at: string): QueueLifecycleFields;
export declare function canonicalTimestamp(value: string, label: string): string;
export declare function assertTimestamp(value: string, label: string): number;
export declare function isTicketState(value: string): value is TicketState;
export declare function isActiveTicketState(value: TicketState): boolean;
export declare function isIdleTicketState(value: TicketState): boolean;
export declare function isTerminalTicketState(value: TicketState): boolean;