virtual bool updateUser(UserId user, const QString &password);
virtual void renameUser(UserId user, const QString &newName);
virtual UserId validateUser(const QString &user, const QString &password);
virtual UserId getUserId(const QString &username);
virtual bool updateUser(UserId user, const QString &password);
virtual void renameUser(UserId user, const QString &newName);
virtual UserId validateUser(const QString &user, const QString &password);
virtual UserId getUserId(const QString &username);