void Core::setBufferLastSeen(UserId user, const BufferId &bufferId, const QDateTime &seenDate) {
QMutexLocker locker(&mutex);
return instance()->storage->setBufferLastSeen(user, bufferId, seenDate);
void Core::setBufferLastSeen(UserId user, const BufferId &bufferId, const QDateTime &seenDate) {
QMutexLocker locker(&mutex);
return instance()->storage->setBufferLastSeen(user, bufferId, seenDate);