declare class SessionGroupStore {
    private data;
    constructor();
    private load;
    private save;
    getActiveGroup(userId: string): string | undefined;
    setActiveGroup(userId: string, chatId: string): void;
    removeGroup(userId: string, chatId: string): void;
    findUserByChatId(chatId: string): string | undefined;
    getGroupInfo(chatId: string): {
        chatId: string;
        createdAt: number;
        title?: string;
    } | undefined;
    updateGroupTitle(chatId: string, title: string): void;
}
export declare const sessionGroupStore: SessionGroupStore;
export {};
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