Session 022: Migrate Lts/Tools (72 submodules) to Qt6

- Copied complete Lts/Tools directory from qt5-before to qt6-after
- Updated 32 CMakeLists.txt files (Qt5:: → Qt6::)
- Tools subdirectory already included in parent Lts/CMakeLists.txt
- All 72 tool submodules now present in qt6-migrated-legatus
- Includes: Adler, ArAssets, ConfigX, DBAdministration, DBUpdate,
  DdsView, InfrastructureManagement, and 67 more tools
- C++17 standard (RTI 7.7.0 compatibility maintained)
- Tests deferred until final validation phase

Migration progress:
✅ Lts/Application (68 files)
✅ Lts/DDS (verified Qt6-ready)
✅ Lts/Plugins (60 submodules, verified)
✅ Lts/Projects (5 submodules, verified)
✅ Lts/Proxies (13 submodules, verified)
✅ Lts/Services (47 submodules, verified)
✅ Lts/Tools (72 submodules, copied + CMake updated)
✅ Lts/Viewer (LtsFileDialog, LtsReportDisplay, SituationMap)
🟡 TetraIF (partial)
🟡 Z (partial: nglwidgets, QtSingleApplication, qsql_informix, WMS_Interface)

qt6-after/qt6-migrated-legatus/Lts/Tools/DBUpdate/show_history.cpp

@@ -0,0 +1,49 @@
+/**
+  * @RDE_HEADER@
+  * DBUpdate - Show history
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Iuliana Ojog, 2021-02-17
+  */
+
+#include "show_history.h"
+#include "ui_show_history.h"
+#include <nglsettings/nglsettings_settings.h>
+
+namespace DBUpdate
+{
+ShowHistory::ShowHistory(QWidget *parent)
+    : QWidget(parent)
+    , m_ui(new Ui::ShowHistory)
+    , m_logger(getLogger("ShowHistory"))
+{
+  m_ui->setupUi(this);
+  connect(m_ui->pbClose, &QPushButton::clicked, this, &ShowHistory::onClosedClicked);
+}
+
+ShowHistory::~ShowHistory()
+{
+  delete m_ui;
+}
+
+bool ShowHistory::init(const QSqlDatabase &db, const QString &schema)
+{
+  m_model = new HistoryModel(this);
+  m_proxyModel = new HistoryProxyModel(this);
+
+  m_model->initModel(db, schema);
+  m_proxyModel->setSourceModel(m_model);
+  m_ui->tvHistory->setModel(m_proxyModel);
+
+  m_ui->tvHistory->resizeColumnsToContents();
+
+  return true;
+}
+
+void ShowHistory::onClosedClicked()
+{
+  close();
+}
+
+} // namespace DBUpdate