Refactor rename ManageEngine to DatabaseManager.
Add signal in DatabaseManager.
Fix include for Qt libs.
Add Member TableView in QML with a ProxyTableModel.
Delete unwanted MemberUiController.
FIX Member TableView in QML with a ProxyTableModel.

Now it works :-)
And here some NOTES:
Use only QAbstractListModel ... other model (for example
QAbstractTableModel etc.) make no sense in QML.
To use C++ Models do not use
QModelIndex index(int row, int column, const QModelIndex &parent) const
method from QSqlTableModel !
Add modelReloaded signal in ProxyTableModel.