feat: added add and delete featuries

src/LicenseModel/LicenseModel.h

@@ -3,6 +3,7 @@
 
 // Qt
 #include <QAbstractItemModel>
+#include <QFutureWatcher>
 #include <QtSql/QSqlDatabase>
 
 class LicenseModel : public QAbstractItemModel
@@ -16,6 +17,7 @@ public:
         Ok,
         DbStructError,
         DbExistError,
+        Working,
     };
 
     struct LicenseItem
@@ -46,10 +48,13 @@ public:
     QString getStatusText();
     bool prepareDatabase();
     void addClient(const LicenseItem &item);
-    void deleteClient(int index);
+    void deleteClient(const QList<int> &rows);
     void editClient(const LicenseItem &item, int index);
+
     void updateModel();
     LicenseItem getItem(int index) const;
+signals:
+    void statusChanged();
 private:
     bool checkTables();
 private: