+ virtual bool removeBuffer(const UserId &user, const BufferId &bufferId);
+ virtual BufferId renameBuffer(const UserId &user, const NetworkId &networkId, const QString &newName, const QString &oldName);
+ virtual void setBufferLastSeen(UserId user, const BufferId &bufferId, const QDateTime &seenDate);
+ virtual QHash<BufferId, QDateTime> bufferLastSeenDates(UserId user);