export declare function clearAllHistory(): Promise<{
    cleared: boolean;
    detail: string;
}>;
export declare function deleteSession(sessionId: string): Promise<{
    deleted: boolean;
    detail: string;
}>;
export declare function purgeSession(sessionId: string): Promise<{
    deleted: boolean;
    detail: string;
    removedWorkspace: boolean;
    removedPlan: boolean;
}>;