diff --git a/qt6-after/qt6-migrated-legatus/CMakeLists.txt b/qt6-after/qt6-migrated-legatus/CMakeLists.txt
index a3e35237d..3c6628f70 100755
--- a/qt6-after/qt6-migrated-legatus/CMakeLists.txt
+++ b/qt6-after/qt6-migrated-legatus/CMakeLists.txt
@@ -69,7 +69,9 @@ include_directories(${CMAKE_SOURCE_DIR}/Lts/Common)
 include_directories(${CMAKE_SOURCE_DIR}/Lts/Common/LtsUtils)
 include_directories(${CMAKE_BINARY_DIR}/Lts/Common/LtsUtils/LtsUtilsCore)
 include_directories(${CMAKE_SOURCE_DIR}/include/Viewer/SituationMap)
-SET(CMAKE_CXX_STANDARD 17)
+include_directories(${CMAKE_SOURCE_DIR}/include/OperatorManagement)
+include_directories(${CMAKE_SOURCE_DIR}/include/FileManagement)
+SET(CMAKE_CXX_STANDARD 23)
 SET(CMAKE_CXX_STANDARD_REQUIRED ON)
 SET(CMAKE_VISIBILITY_INLINES_HIDDEN ON)
 SET(CMAKE_CXX_VISIBILITY_PRESET hidden)
@@ -257,6 +259,19 @@ IF(BUILD_RTI AND TARGET RTI::nddsc)
   ADD_LIBRARY(ddscpp ALIAS RTI::nddscpp)
   ADD_LIBRARY(ddscpp2 ALIAS RTI::nddscpp2)
   ADD_LIBRARY(nddsctesthelpers ALIAS RTI::nddsctesthelpers)
+  ADD_LIBRARY(ddsftc ALIAS RTI::ddsftc)
+  ADD_LIBRARY(ddsfts ALIAS RTI::ddsfts)
+  ADD_LIBRARY(ddsconnector ALIAS RTI::ddsconnector)
+ELSE()
+  # BUILD_RTI=OFF: Leere Interface-Libraries als Platzhalter
+  ADD_LIBRARY(ddsc INTERFACE)
+  ADD_LIBRARY(ddscore INTERFACE)
+  ADD_LIBRARY(ddscpp INTERFACE)
+  ADD_LIBRARY(ddscpp2 INTERFACE)
+  ADD_LIBRARY(nddsctesthelpers INTERFACE)
+  ADD_LIBRARY(ddsftc INTERFACE)
+  ADD_LIBRARY(ddsfts INTERFACE)
+  ADD_LIBRARY(ddsconnector INTERFACE)
 ENDIF()
 
 ADD_DEFINITIONS(-DQT_USE_QSTRINGBUILDER)
diff --git a/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_db_impl_custom.cpp b/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_db_impl_custom.cpp
index b97770f4d..747a39b0a 100755
--- a/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_db_impl_custom.cpp
+++ b/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_db_impl_custom.cpp
@@ -7,6 +7,7 @@
   */
 
 #include "flm_db_impl_custom.h"
+#include <FileManagement/flm_db_impl.h>
 #include <ngldb/nsqlquery.h>
 #include <ngldb/sql_query_janitor.h>
 #include <QtCore/QRegularExpression>
@@ -59,9 +60,9 @@ bool DatabaseInterfaceImplCustom::updateStatus(int fileId, const FileStatus &sta
 
   DEBUG_LOG(m_logger) << "File name before = " << fileName;
 
-  if (status.underlying() == 1) // Delete
+  if (status == 1) // Delete
     fileName = QStringLiteral("{")+QString::number(fileId)+QStringLiteral("}_")+fileName;
-  if (status.underlying() == 0 && fileName.startsWith(QStringLiteral("{"))) // Restore
+  if (status == 0 && fileName.startsWith(QStringLiteral("{"))) // Restore
     fileName.remove(QRegularExpression(QStringLiteral("^[{](\\d+)[}][_]")));
 
   DEBUG_LOG(m_logger) << "File name after = " << fileName;
@@ -76,7 +77,7 @@ bool DatabaseInterfaceImplCustom::updateStatus(int fileId, const FileStatus &sta
     }
 
     m_query->bindValue(QStringLiteral(":id"), fileId);
-    m_query->bindValue(QStringLiteral(":st"), status.underlying());
+    m_query->bindValue(QStringLiteral(":st"), static_cast<int>(status));
     m_query->bindValue(QStringLiteral(":opId"), operatorId);
     m_query->bindValue(QStringLiteral(":lastMod"), QDateTime::currentMSecsSinceEpoch());
     m_query->bindValue(QStringLiteral(":name"), fileName);
diff --git a/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_db_impl_custom.h b/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_db_impl_custom.h
index 8c067b483..e77d866b2 100755
--- a/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_db_impl_custom.h
+++ b/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_db_impl_custom.h
@@ -13,7 +13,6 @@ namespace FileManagement
 {
 class DatabaseInterfaceImplCustom final : public DatabaseInterfaceImpl
 {
-  Q_OBJECT
 public:
   using DatabaseInterfaceImpl::DatabaseInterfaceImpl;
 
diff --git a/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_dtc_impl_custom.h b/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_dtc_impl_custom.h
index e098dab0a..fa4626877 100755
--- a/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_dtc_impl_custom.h
+++ b/qt6-after/qt6-migrated-legatus/Lts/Services/FileManagement/flm_dtc_impl_custom.h
@@ -8,7 +8,7 @@
   */
 #pragma once
 
-#include <Lts/Services/FileManagement/flm_dtc_impl.h>
+#include <FileManagement/flm_dtc_impl.h>
 #include <functional>
 
 //-------------------------------------------------------------------------------------------------------------
@@ -18,7 +18,6 @@ namespace Interface
 {
 class DtcImplCustom final : public Interface::DtcImpl
 {
-  Q_OBJECT
 public:
   explicit DtcImplCustom(const std::shared_ptr<DDSConnector::DdsConnector> &ddsConnector);
 
diff --git a/qt6-after/qt6-migrated-legatus/Lts/Services/OperatorManagement/opm_dtc_impl_custom.cpp b/qt6-after/qt6-migrated-legatus/Lts/Services/OperatorManagement/opm_dtc_impl_custom.cpp
index c6272eec2..71d20d13b 100755
--- a/qt6-after/qt6-migrated-legatus/Lts/Services/OperatorManagement/opm_dtc_impl_custom.cpp
+++ b/qt6-after/qt6-migrated-legatus/Lts/Services/OperatorManagement/opm_dtc_impl_custom.cpp
@@ -13,8 +13,10 @@
 #include <QJsonObject>
 #include <QVariantList>
 #include <QtCore/QVector>
+#if BUILD_RTI
 #include <DDS/DTC/generic_dtc.h>
 #include <DDS/Generic/generic_data_reader.h>
+#endif
 
 namespace OperatorManagement
 {
@@ -25,12 +27,12 @@ DtcImplCustom::DtcImplCustom(const std::shared_ptr<DDSConnector::DdsConnector> &
 {
 }
 
-QVector<int> DtcImplCustom::getOperatorsByOperatorRight(int operatorRight)
+std::vector<int> DtcImplCustom::getOperatorsByOperatorRight(int operatorRight)
 {
-  QVector<int> ret;
+  std::vector<int> ret;
 
   DEBUG_LOG(m_logger) << "OperatorRight: " << operatorRight;
-  for (const User &user : qAsConst(m_userCont))
+  for (const User &user : std::as_const(m_userCont))
   {
     for (int acl : user.effectiveAcls())
     {
@@ -38,7 +40,7 @@ QVector<int> DtcImplCustom::getOperatorsByOperatorRight(int operatorRight)
         continue;
 
       DEBUG_LOG(m_logger) << "Found acl in Operator " << user.id() << ", operatorRight=" << operatorRight << ", acl=" << acl;
-      ret.append(user.id());
+      ret.push_back(user.id());
       break;
     }
   }
@@ -46,13 +48,13 @@ QVector<int> DtcImplCustom::getOperatorsByOperatorRight(int operatorRight)
   return ret;
 }
 
-QVector<int> DtcImplCustom::operatorForExerciseParty(int exerciseId, int partyId)
+std::vector<int> DtcImplCustom::operatorForExerciseParty(int exerciseId, int partyId)
 {
-  QVector<int> ret = {};
+  std::vector<int> ret;
 
   DEBUG_LOG(m_logger) << LOGFUNCTION << " exerciseId: " << exerciseId << ", partyId: " << partyId;
 
-  for (const User &user : qAsConst(m_userCont))
+  for (const User &user : std::as_const(m_userCont))
   {
     const auto visiblePartiesByExercise = user.visiblePartiesByExercise();
     for (const auto &pbe : visiblePartiesByExercise)
@@ -60,14 +62,17 @@ QVector<int> DtcImplCustom::operatorForExerciseParty(int exerciseId, int partyId
       if (pbe.exerciseId() != exerciseId)
         continue;
 
-      if (!pbe.visibleParties().is_set())
+      if (!pbe.visibleParties().has_value())
         continue;
 
-      std::vector<int32_t> hiddenParties = {};
-      if (pbe.hiddenParties().is_set())
-        hiddenParties = pbe.hiddenParties().get();
+      std::vector<int> hiddenParties;
+      if (pbe.hiddenParties().has_value())
+      {
+        const auto& hiddenQVec = pbe.hiddenParties().value();
+        hiddenParties = std::vector<int>(hiddenQVec.begin(), hiddenQVec.end());
+      }
 
-      for (const auto &id : pbe.visibleParties().get())
+      for (const auto &id : pbe.visibleParties().value())
       {
         if (id != partyId)
           continue;
@@ -81,7 +86,7 @@ QVector<int> DtcImplCustom::operatorForExerciseParty(int exerciseId, int partyId
         }
 
         if (!isHidden)
-          ret.append(user.id());
+          ret.push_back(user.id());
       }
     }
   }
@@ -113,7 +118,7 @@ bool DtcImplCustom::sendAdlerNotification(const QString &jsonStr, const int exer
   DEBUG_LOG(m_logger) << "sendAdlerNotification";
 
   const QJsonArray &exercisesArr = doc.object().value(QStringLiteral("Exercises")).toArray();
-  for (const QJsonValue &exercisesVal : qAsConst(exercisesArr))
+  for (const QJsonValue &exercisesVal : exercisesArr)
   {
     const QJsonObject exercisesObj = exercisesVal.toObject();
 
@@ -135,7 +140,7 @@ bool DtcImplCustom::sendAdlerNotification(const QString &jsonStr, const int exer
     // 2. Array durchlaufen
     QJsonArray notifications = exercisesObj.value(QStringLiteral("suppressNotifications")).toArray();
 
-    for (const QJsonValue &val : qAsConst(notifications))
+    for (const QJsonValue &val : notifications)
     {
       DEBUG_LOG(m_logger) << "sendAdlerNotification notifications";
       const QJsonObject entry = val.toObject();
@@ -159,17 +164,18 @@ bool DtcImplCustom::sendAdlerNotification(const QString &jsonStr, const int exer
   return !found;
 }
 
-QVector<int> DtcImplCustom::getNotificationRecipents(const int exerciseId, const int partyId, const int operatorRight, const int notificationType)
+std::vector<int> DtcImplCustom::getNotificationRecipents(const int exerciseId, const int partyId, const int operatorRight, const int notificationType)
 {
-  const QVector<int> operatorsByOperatorRight = getOperatorsByOperatorRight(operatorRight);
-  QVector<int> operatorIds;
+  const std::vector<int> operatorsByOperatorRight = getOperatorsByOperatorRight(operatorRight);
+  std::vector<int> operatorIds;
 
   for (const auto &userId : operatorsByOperatorRight)
   {
     bool inExercise = false;
     const auto user = m_userCont.value(userId);
     // Only include operators who are assigned to the exercise.
-    for (const auto &exerciseIdUser : qAsConst(user.exerciseIds()))
+    const auto& exerciseIds = user.exerciseIds();
+    for (const auto &exerciseIdUser : exerciseIds)
     {
       if (exerciseIdUser == exerciseId)
       {
@@ -184,7 +190,7 @@ QVector<int> DtcImplCustom::getNotificationRecipents(const int exerciseId, const
     }
     DEBUG_LOG(m_logger) << "getNotificationRecipents OperatorId" << user.id() << ", Name=" << user.name() << ", properties=" << user.properties();
     if (isAdlerAllowedParty(exerciseId, partyId, user.id()) &&
-        sendAdlerNotification(QString::fromStdString(user.properties()), exerciseId, partyId, notificationType))
+        sendAdlerNotification(user.properties(), exerciseId, partyId, notificationType))
       operatorIds.push_back(user.id());
   }
   return operatorIds;
@@ -201,7 +207,7 @@ bool DtcImplCustom::isAdlerAllowedParty(int exerciseId, int partyId, int operato
     if (pbe.exerciseId() != exerciseId)
       continue;
 
-    const QJsonObject propsObj(QJsonDocument::fromJson(QByteArray::fromStdString(pbe.properties())).object());
+    const QJsonObject propsObj(QJsonDocument::fromJson(pbe.properties().toUtf8()).object());
     const QJsonArray parties = propsObj.value(QStringLiteral("adlerAllowed")).toArray();
 
     for (const QJsonValue &val : parties)
diff --git a/qt6-after/qt6-migrated-legatus/Lts/Services/OperatorManagement/opm_dtc_impl_custom.h b/qt6-after/qt6-migrated-legatus/Lts/Services/OperatorManagement/opm_dtc_impl_custom.h
index 1ee6ea292..989aef37e 100755
--- a/qt6-after/qt6-migrated-legatus/Lts/Services/OperatorManagement/opm_dtc_impl_custom.h
+++ b/qt6-after/qt6-migrated-legatus/Lts/Services/OperatorManagement/opm_dtc_impl_custom.h
@@ -19,15 +19,13 @@ namespace Interface
 {
 class DtcImplCustom final : public Interface::DtcImpl
 {
-
-  Q_OBJECT
 public:
   explicit DtcImplCustom(const std::shared_ptr<DDSConnector::DdsConnector> &ddsConnector);
 
   // custom procs, body must be implemented by user
-  QVector<int> getOperatorsByOperatorRight(int operatorRight) override;
-  QVector<int> operatorForExerciseParty(int exerciseId, int partyId) override;
-  QVector<int> getNotificationRecipents (const int exerciseId, const int partyId, const int operatorRight, const int notificationType) override;
+  std::vector<int> getOperatorsByOperatorRight(int operatorRight) override;
+  std::vector<int> operatorForExerciseParty(int exerciseId, int partyId) override;
+  std::vector<int> getNotificationRecipents (const int exerciseId, const int partyId, const int operatorRight, const int notificationType) override;
   bool isAdlerAllowedParty(int exerciseId, int partyId, int operatorId) override;
 
 private:
diff --git a/qt6-after/qt6-migrated-legatus/include/DDS/DTC/generic_dtc.h b/qt6-after/qt6-migrated-legatus/include/DDS/DTC/generic_dtc.h
new file mode 100644
index 000000000..7d0411795
--- /dev/null
+++ b/qt6-after/qt6-migrated-legatus/include/DDS/DTC/generic_dtc.h
@@ -0,0 +1,97 @@
+/**
+  * @RDE_HEADER@
+  * DTC TypeDefinitions - Stub für BUILD_RTI=OFF
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#pragma once
+
+// Stub für BUILD_RTI=OFF - keine RTI Connext DDS Verfügbarkeit
+// Diese Header ermöglicht Kompilierung ohne RTI DDS Dependencies
+
+#include <functional>
+#include <string>
+#include <LtsUtils/LtsUtilsCore/data_modification_enum.h>
+
+// Forward declarations für DDS-Typen (Stubs)
+namespace dds {
+namespace sub {
+  template<typename T>
+  struct LoanedSamples {
+    // Minimaler Stub - keine Implementierung für BUILD_RTI=OFF
+  };
+  
+  struct SampleInfo {
+    // Minimaler Stub - keine Implementierung für BUILD_RTI=OFF
+  };
+}
+}
+
+namespace NGLLogger
+{
+class INGLLogger;
+}
+
+namespace DTC
+{
+class SubscriberListener;
+
+// DataModification Enum aus LtsUtilsCore/data_modification_enum.h stub
+enum class DataModification {
+  Added,
+  Modified,
+  Removed
+};
+
+// uses DRO (static)
+template <typename DRO_OBJECT, typename SC>
+class GenericDtcSC
+{
+public:
+  using DataReaderObject   = DRO_OBJECT;
+  using SubscriberCallback = SC;
+  using TopicType          = typename DRO_OBJECT::TopicType;
+
+  GenericDtcSC() = default;
+  virtual ~GenericDtcSC() = default;
+
+  virtual bool setSubscriberCallback(const SubscriberCallback &subscriberCallback) = 0;
+  virtual dds::sub::LoanedSamples<TopicType> readAlive() const = 0;
+  virtual dds::sub::LoanedSamples<TopicType> takeAlive() const = 0;
+  virtual dds::sub::LoanedSamples<TopicType> takeDisposed() const = 0;
+  virtual bool hasSamples() const = 0;
+  virtual DataReaderObject *dataReader() const = 0;
+  virtual bool waitForHistoricalData(int timeoutMSec) = 0;
+};
+
+
+// Typed topic callback (DataReader)
+template<typename DRO_OBJECT>
+class GenericDtc
+    : public GenericDtcSC<DRO_OBJECT,
+    std::function<void(const typename DRO_OBJECT::TopicType &, DataModification)> >
+{};
+
+// Typed topic callback (DataReader) with SampleInfo
+template<typename DRO_OBJECT>
+class GenericDtcSampleInfo
+    : public GenericDtcSC<DRO_OBJECT,
+    std::function<void(const typename DRO_OBJECT::TopicType &, const dds::sub::SampleInfo &)> >
+{};
+
+// Dynamic topic callback (DynamicDataReader)
+template<typename DRO_OBJECT>
+class Ddtc
+    : public GenericDtcSC<DRO_OBJECT,
+    std::function<void(const typename DRO_OBJECT::TopicType &, const std::string &, DataModification)> >
+{};
+
+// Dynamic topic callback (DynamicDataReader) with SampleInfo
+template<typename DRO_OBJECT>
+class DdtcSampleInfo
+    : public GenericDtcSC<DRO_OBJECT,
+    std::function<void(const typename DRO_OBJECT::TopicType &, const std::string &, const dds::sub::SampleInfo &)> >
+{};
+}
\ No newline at end of file
diff --git a/qt6-after/qt6-migrated-legatus/include/DDS/Generic/ddsgen_export.h b/qt6-after/qt6-migrated-legatus/include/DDS/Generic/ddsgen_export.h
new file mode 100644
index 000000000..818f6bde7
--- /dev/null
+++ b/qt6-after/qt6-migrated-legatus/include/DDS/Generic/ddsgen_export.h
@@ -0,0 +1,32 @@
+#pragma once
+
+// Stub header for BUILD_RTI=OFF
+// Original ddsgen_export.h comes from RTI Connext DDS code generation
+
+// For BUILD_RTI=OFF, we don't need DLL export/import macros
+// Define DDSGEN_EXPORT as empty
+#ifndef DDSGEN_EXPORT
+#define DDSGEN_EXPORT
+#endif
+
+#ifndef DDSGEN_NO_EXPORT
+#define DDSGEN_NO_EXPORT
+#endif
+
+// Static library marker (not used for BUILD_RTI=OFF)
+#ifndef DDSGEN_STATIC_DEFINE
+#define DDSGEN_STATIC_DEFINE
+#endif
+
+// Deprecated marker (optional, can be empty)
+#ifndef DDSGEN_DEPRECATED
+#define DDSGEN_DEPRECATED
+#endif
+
+#ifndef DDSGEN_DEPRECATED_EXPORT
+#define DDSGEN_DEPRECATED_EXPORT DDSGEN_DEPRECATED DDSGEN_EXPORT
+#endif
+
+#ifndef DDSGEN_DEPRECATED_NO_EXPORT
+#define DDSGEN_DEPRECATED_NO_EXPORT DDSGEN_DEPRECATED DDSGEN_NO_EXPORT
+#endif
\ No newline at end of file
diff --git a/qt6-after/qt6-migrated-legatus/include/DDS/Generic/generic_base.h b/qt6-after/qt6-migrated-legatus/include/DDS/Generic/generic_base.h
new file mode 100644
index 000000000..3494eec30
--- /dev/null
+++ b/qt6-after/qt6-migrated-legatus/include/DDS/Generic/generic_base.h
@@ -0,0 +1,51 @@
+#pragma once
+
+// Stub header for BUILD_RTI=OFF
+// Original generic_base.h uses RTI Connext DDS types
+
+#include <string>
+#include <ddsgen_export.h>
+
+// Forward declarations for Qt types used in getMethod
+class QObject;
+class QMetaMethod;
+
+// Forward declaration for NGL logger
+namespace NGL {
+class INGLLogger;
+}
+
+namespace DDS
+{
+
+// Template for topic type name - returns empty string for BUILD_RTI=OFF
+template<typename T>
+struct topic_type_name {
+    static std::string value() {
+        return "";
+    }
+};
+
+namespace Helper
+{
+// Stub implementations for BUILD_RTI=OFF
+DDSGEN_EXPORT inline std::string getFunctionTopicName(const std::string &fqName) {
+    return fqName;
+}
+
+DDSGEN_EXPORT inline std::string getShortTopicName(const std::string &fqName) {
+    return fqName;
+}
+
+// Stub for getMethod - returns default-constructed QMetaMethod
+DDSGEN_EXPORT inline QMetaMethod getMethod(NGL::INGLLogger &logger,
+                                           QObject *objectToInform,
+                                           const char *slotToExecute,
+                                           const char *signalSignature,
+                                           bool bWarnOnEmptySlot = true) {
+    // Stub implementation - returns default QMetaMethod
+    return QMetaMethod();
+}
+}
+
+} // namespace DDS
\ No newline at end of file
diff --git a/qt6-after/qt6-migrated-legatus/include/DDS/Generic/generic_data_reader.h b/qt6-after/qt6-migrated-legatus/include/DDS/Generic/generic_data_reader.h
new file mode 100644
index 000000000..fee4cdcd5
--- /dev/null
+++ b/qt6-after/qt6-migrated-legatus/include/DDS/Generic/generic_data_reader.h
@@ -0,0 +1,44 @@
+#pragma once
+
+/**
+ * @file generic_data_reader.h
+ * @brief Stub header for BUILD_RTI=OFF configuration
+ * 
+ * This file provides minimal stub definitions for DDS Generic Data Reader
+ * when RTI Connext DDS is not available (BUILD_RTI=OFF).
+ */
+
+#ifdef BUILD_RTI
+// RTI DDS is available - include the real implementation
+#include <Lts/DDS/Generic/generic_data_reader.h>
+#else
+// BUILD_RTI=OFF: Provide minimal stub definitions
+
+namespace dds {
+namespace sub {
+
+// Forward declaration stub for DataReader
+template<typename T>
+class DataReader {
+public:
+    // Minimal stub interface - add methods as needed by the codebase
+    T read() { return T{}; }
+    void take() {}
+};
+
+} // namespace sub
+} // namespace dds
+
+// GenericDataReader stub template
+template<typename T>
+class GenericDataReader {
+public:
+    using DataType = T;
+    
+    // Minimal stub methods - extend as needed
+    bool has_data() const { return false; }
+    T read_data() { return T{}; }
+    void cleanup() {}
+};
+
+#endif // BUILD_RTI
\ No newline at end of file
diff --git a/qt6-after/qt6-migrated-legatus/include/DDS/Generic/generic_logger.h b/qt6-after/qt6-migrated-legatus/include/DDS/Generic/generic_logger.h
new file mode 100644
index 000000000..e3a0711fc
--- /dev/null
+++ b/qt6-after/qt6-migrated-legatus/include/DDS/Generic/generic_logger.h
@@ -0,0 +1,49 @@
+#pragma once
+
+// Stub header for BUILD_RTI=OFF
+// Original generic_logger.h uses NGL::INGLLogger from RTI infrastructure
+
+#include <NGLLogger/INGLLogger.h>
+#include <ddsgen_export.h>
+#include <string>
+
+namespace DDS
+{
+
+// DataType enum - same as original, no RTI dependency
+enum class DataType
+{
+  DATA_TYPE_UNKNOWN   = 0,
+
+  DATA_WRITER         = 1,
+  DATA_READER         = 2,
+
+  DYNAMIC_DATA_WRITER = 3,
+  DYNAMIC_DATA_READER = 4,
+
+  DATA_TOPIC_SERVER   = 8,
+  DATA_TOPIC_CLIENT   = 9,
+
+  FUNCTION_TOPIC_SERVER = 12,
+  FUNCTION_TOPIC_CLIENT = 13
+};
+
+// Logger type alias
+using LOGGER_T = NGL::INGLLogger&;
+
+// Stub implementation for getLogger
+// Returns a dummy logger reference - in real usage, this would need proper initialization
+DDSGEN_EXPORT inline LOGGER_T getLogger(const char *name, DataType dt) {
+    // Stub: return a static dummy logger
+    // In production code with BUILD_RTI=OFF, this should be replaced with actual logger
+    static NGL::INGLLogger* dummy_logger = nullptr;
+    return *dummy_logger;
+}
+
+// Inline overload for std::string
+inline LOGGER_T getLogger(const std::string &loggerName, DataType dt)
+{
+  return getLogger(loggerName.data(), dt);
+}
+
+} // namespace DDS
\ No newline at end of file
diff --git a/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_db.h b/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_db.h
index 3de373870..87a8b8249 100644
--- a/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_db.h
+++ b/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_db.h
@@ -91,7 +91,7 @@ public:
       , m_exerciseId(std::nullopt)
       , m_phaseId(std::nullopt)
       , m_size(0)
-      , m_fileStatus(FileStatus::Valid)
+      , m_fileStatus(FileStatus_Valid)
       , m_fileCategory(FileCategory::Global)
       , m_fileType(FileType::Unknown)
       , m_isTemplate(false)
@@ -121,7 +121,7 @@ public:
   FileCategory fileCategory() const { return m_fileCategory; }
   FileType fileType() const { return m_fileType; }
   bool isTemplate() const { return m_isTemplate; }
-  bool isDeleted() const { return m_fileStatus == FileStatus::Deleted; }
+  bool isDeleted() const { return m_fileStatus == FileStatus_Deleted; }
   bool isHidden() const { return m_hidden; }
   bool isUsedBy() const { return m_used; }
   std::string usedBy() const { return m_usedBy; }
diff --git a/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_db_impl.h b/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_db_impl.h
index c665ad8ed..075bd09f5 100644
--- a/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_db_impl.h
+++ b/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_db_impl.h
@@ -6,8 +6,62 @@
   */
 #pragma once
 
-#include <QObject>
+#include <QString>
 #include <FileManagement/flm_db.h>
+#include <ngldb/nsqlquery.h>
+
+// Minimal Logger stub for BUILD_RTI=OFF
+namespace NGL
+{
+enum class LogLevel
+{
+  Undefined = 0,
+  Trace     = 64,
+  Debug     = 96,
+  Info      = 128,
+  Warning   = 150,
+  Error     = 182,
+  Fatal     = 214,
+};
+
+class Logger
+{
+public:
+  bool isTraceEnabled() const { return false; }
+  bool isDebugEnabled() const { return true; }
+  bool isInfoEnabled() const { return true; }
+  bool isWarningEnabled() const { return true; }
+  bool isErrorEnabled() const { return true; }
+  bool isFatalEnabled() const { return true; }
+};
+}
+
+// Logger macros (simplified for Qt6) - work with pointer
+#define LOGFUNCTION Q_FUNC_INFO
+
+#ifdef LTS_DEBUG
+#define TRACE_LOG(logger) \
+  for (bool log_level_enabled = (logger)->isDebugEnabled(); log_level_enabled; log_level_enabled = false) \
+    qDebug() << "[TRACE]" << __FILE__ << ":" << __LINE__ << Q_FUNC_INFO
+#else
+#define TRACE_LOG(logger) \
+  if (false) qDebug()
+#endif
+
+#define DEBUG_LOG(logger) \
+  if (!(logger)->isDebugEnabled()) {} else qDebug() << "[DEBUG]" << __FILE__ << ":" << __LINE__ << Q_FUNC_INFO
+
+#define INFO_LOG(logger) \
+  if (!(logger)->isInfoEnabled()) {} else qDebug() << "[INFO]" << __FILE__ << ":" << __LINE__ << Q_FUNC_INFO
+
+#define WARNING_LOG(logger) \
+  if (!(logger)->isWarningEnabled()) {} else qWarning() << "[WARNING]" << __FILE__ << ":" << __LINE__ << Q_FUNC_INFO
+
+#define ERROR_LOG(logger) \
+  if (!(logger)->isErrorEnabled()) {} else qCritical() << "[ERROR]" << __FILE__ << ":" << __LINE__ << Q_FUNC_INFO
+
+#define FATAL_LOG(logger) \
+  if (!(logger)->isFatalEnabled()) {} else qCritical() << "[FATAL]" << __FILE__ << ":" << __LINE__ << Q_FUNC_INFO
 
 namespace FileManagement
 {
@@ -18,16 +72,33 @@ namespace FileManagement
  * This class is normally generated by CODEGEN_DATABASE macro.
  * This stub provides minimal interface for BUILD_RTI=OFF builds.
  */
-class DatabaseInterfaceImpl : public QObject
+class DatabaseInterfaceImpl
 {
-  Q_OBJECT
 public:
-  explicit DatabaseInterfaceImpl(QObject *parent = nullptr) : QObject(parent) {}
-  virtual ~DatabaseInterfaceImpl() = default;
+  DatabaseInterfaceImpl()
+    : m_logger(nullptr)
+    , m_query(nullptr)
+  {
+    m_logger = new NGL::Logger();
+    m_query = new NSqlQuery(QSqlDatabase());
+  }
+  virtual ~DatabaseInterfaceImpl()
+  {
+    delete m_logger;
+    delete m_query;
+  }
 
   // Virtual methods that can be overridden by custom implementations
   virtual bool updateStatus(int fileId, const FileStatus &status, int operatorId) = 0;
   virtual bool setUsedBy(int fileId, const bool &usedBy, int usedNo, int operatorId) = 0;
+
+protected:
+  // Member variables expected by custom implementations
+  NGL::Logger* m_logger;
+  NSqlQuery* m_query;
+
+  // Helper methods expected by custom implementations
+  QString getTableName(const QString &baseName) const { return baseName; }
 };
 
 } // namespace FileManagement
\ No newline at end of file
diff --git a/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_dtc_impl.h b/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_dtc_impl.h
new file mode 100644
index 000000000..2e4496d1b
--- /dev/null
+++ b/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_dtc_impl.h
@@ -0,0 +1,86 @@
+/**
+  * @RDE_HEADER@
+  * FileManagement DTC Implementation
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Stub-Header für Qt6-Migration - ersetzt DDS-generierten Header
+  */
+#pragma once
+
+#include <FileManagement/flm_db_impl.h>
+#include <DDS/DTC/generic_dtc.h>
+#include <memory>
+
+// Forward declarations für DDS
+namespace DDSConnector
+{
+class DdsConnector;
+}
+
+// Stub für DDS DataReader - wird normalerweise von DDS generiert
+template<typename T>
+class DdsDataReaderStub
+{
+public:
+  struct LoanedSamplesWrapper
+  {
+    auto begin() { return m_samples.begin(); }
+    auto end() { return m_samples.end(); }
+    std::vector<T> m_samples;
+  };
+  
+  LoanedSamplesWrapper readAlive() { return LoanedSamplesWrapper{}; }
+};
+
+//-------------------------------------------------------------------------------------------------------------
+namespace FileManagement
+{
+namespace Interface
+{
+/**
+ * @brief DtcImpl - Basisklasse für FileManagement DTC
+ * 
+ * Stellt Logger und DDS-DataReader für Custom-Implementierungen bereit
+ * Erbt von DatabaseInterfaceImpl für Datenbank-Zugriff
+ */
+class DtcImpl : public DatabaseInterfaceImpl
+{
+public:
+  explicit DtcImpl(const std::shared_ptr<DDSConnector::DdsConnector> &ddsConnector)
+    : DatabaseInterfaceImpl()
+    , m_ddsConnector(ddsConnector)
+    , m_dtcFileContent(std::make_unique<DdsDataReaderStub<FileContent>>())
+    , m_dtcFolder(std::make_unique<DdsDataReaderStub<Folder>>())
+  {
+    // Logger wird von DatabaseInterfaceImpl bereitgestellt
+    // m_logger ist in DatabaseInterfaceImpl definiert
+  }
+
+  ~DtcImpl() override = default;
+
+  // Virtuelle Methoden für Custom-Implementierung
+  virtual bool getAllTemplates(QList<FileContent> &allTemplates) = 0;
+  virtual bool getAllFiles(const FileType &fileType, int folderId, QStringList &allFiles, bool showHidden = false) = 0;
+  virtual bool getFilesOperator(const FileType &fileType, int folderId, int operatorId, QStringList &allFiles) = 0;
+  virtual bool getFile(const FileType &fileType, int folderId, const QString &fileName, FileContent &fileMetadata) = 0;
+  virtual int getExerciseId(int folderId) = 0;
+  virtual int getFileId(const FileType &fileType, const QString &fileName, int exerciseId, int phaseId) = 0;
+  virtual int findFolder(int parentId, const QString &name) const = 0;
+  virtual int getExerciseFolderId(int exerciseId) const = 0;
+  virtual int getPhaseFolderId(int exerciseId, int phaseId) const = 0;
+  virtual int getPartyFolderId(int exerciseId, int partyId) const = 0;
+
+  // Default-Implementierungen für Namen-Helper
+  virtual QString getExerciseFolderName(int exerciseId) const { return QLatin1String("$EX_") + QString::number(exerciseId); }
+  virtual QString getPartyFolderName(int partyId) const { return QLatin1String("$PY_") + QString::number(partyId); }
+  virtual QString getPhaseFolderName(int phaseId) const { return QLatin1String("$PH_") + QString::number(phaseId); }
+
+protected:
+  std::shared_ptr<DDSConnector::DdsConnector> m_ddsConnector;
+  std::unique_ptr<DdsDataReaderStub<FileContent>> m_dtcFileContent;
+  std::unique_ptr<DdsDataReaderStub<Folder>> m_dtcFolder;
+};
+
+} // namespace Interface
+} // namespace FileManagement
\ No newline at end of file
diff --git a/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_enums.hpp b/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_enums.hpp
index aacdeac59..0191c52c2 100644
--- a/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_enums.hpp
+++ b/qt6-after/qt6-migrated-legatus/include/FileManagement/flm_enums.hpp
@@ -8,7 +8,14 @@
 namespace FileManagement
 {
 // Enums aus flm_service.xml
+// Für BUILD_RTI=OFF: FileStatus als int, um direkte Vergleiche zu ermöglichen
+#ifndef BUILD_RTI
+using FileStatus = int;
+constexpr int FileStatus_Valid = 0;
+constexpr int FileStatus_Deleted = 1;
+#else
 enum class FileStatus : int { Valid = 0, Deleted = 1 };
+#endif
 
 enum class FileCategory : int { Global = 1, Exercise = 2, User = 3 };
 
diff --git a/qt6-after/qt6-migrated-legatus/include/LtsUtils/LtsUtilsCore/data_modification_enum.h b/qt6-after/qt6-migrated-legatus/include/LtsUtils/LtsUtilsCore/data_modification_enum.h
new file mode 100644
index 000000000..c6c7283c8
--- /dev/null
+++ b/qt6-after/qt6-migrated-legatus/include/LtsUtils/LtsUtilsCore/data_modification_enum.h
@@ -0,0 +1,18 @@
+/**
+  * Enum to describe the type of modification for an incoming data topic
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2016-02-26
+  * 
+  * Stub für BUILD_RTI=OFF
+  */
+
+#pragma once
+
+enum class DataModification
+{
+  eAdded,
+  eModified,
+  eRemoved
+};
\ No newline at end of file
diff --git a/qt6-after/qt6-migrated-legatus/include/OperatorManagement/opm_dtc_impl.h b/qt6-after/qt6-migrated-legatus/include/OperatorManagement/opm_dtc_impl.h
new file mode 100644
index 000000000..7be83491c
--- /dev/null
+++ b/qt6-after/qt6-migrated-legatus/include/OperatorManagement/opm_dtc_impl.h
@@ -0,0 +1,93 @@
+/**
+  * @RDE_HEADER@
+  * OperatorManagement DTC Implementation
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Stub-Header für Qt6-Migration - ersetzt DDS-generierten Header
+  */
+#pragma once
+
+#include <FileManagement/flm_db_impl.h>
+#include <QHash>
+#include <memory>
+
+// Forward declarations für DDS
+namespace DDSConnector
+{
+class DdsConnector;
+}
+
+// User-Klasse Stub für Qt6-Migration
+// Hinweis: Diese Klasse wird normalerweise von DDS generiert
+// Dieser Stub stellt die benötigten Methoden für opm_dtc_impl_custom.cpp bereit
+class User
+{
+public:
+  int id() const { return m_id; }
+  QString name() const { return m_name; }
+  QVector<int> effectiveAcls() const { return m_effectiveAcls; }
+  
+  struct VisiblePartyByExercise
+  {
+    int exerciseId() const { return m_exerciseId; }
+    std::optional<QVector<int>> visibleParties() const { return m_visibleParties; }
+    std::optional<QVector<int>> hiddenParties() const { return m_hiddenParties; }
+    QString properties() const { return m_properties; }
+    
+    int m_exerciseId = 0;
+    std::optional<QVector<int>> m_visibleParties;
+    std::optional<QVector<int>> m_hiddenParties;
+    QString m_properties;
+  };
+  
+  QVector<VisiblePartyByExercise> visiblePartiesByExercise() const { return m_visiblePartiesByExercise; }
+  QVector<int> exerciseIds() const { return m_exerciseIds; }
+  QString properties() const { return m_properties; }
+  
+private:
+  int m_id = 0;
+  QString m_name;
+  QVector<int> m_effectiveAcls;
+  QVector<VisiblePartyByExercise> m_visiblePartiesByExercise;
+  QVector<int> m_exerciseIds;
+  QString m_properties;
+};
+
+//-------------------------------------------------------------------------------------------------------------
+namespace OperatorManagement
+{
+namespace Interface
+{
+/**
+ * @brief DtcImpl - Basisklasse für OperatorManagement DTC
+ * 
+ * Stellt Logger und User-Container für Custom-Implementierungen bereit
+ * Erbt von FileManagement::DatabaseInterfaceImpl für Datenbank-Zugriff
+ */
+class DtcImpl : public FileManagement::DatabaseInterfaceImpl
+{
+public:
+  explicit DtcImpl(const std::shared_ptr<DDSConnector::DdsConnector> &ddsConnector)
+    : FileManagement::DatabaseInterfaceImpl()
+    , m_ddsConnector(ddsConnector)
+  {
+    // Logger wird von DatabaseInterfaceImpl bereitgestellt
+    // m_logger ist in DatabaseInterfaceImpl definiert
+  }
+
+  ~DtcImpl() override = default;
+
+  // Virtuelle Methoden für Custom-Implementierung
+  virtual std::vector<int> getOperatorsByOperatorRight(int operatorRight) = 0;
+  virtual std::vector<int> operatorForExerciseParty(int exerciseId, int partyId) = 0;
+  virtual std::vector<int> getNotificationRecipents(int exerciseId, int partyId, int operatorRight, int notificationType) = 0;
+  virtual bool isAdlerAllowedParty(int exerciseId, int partyId, int operatorId) = 0;
+
+protected:
+  std::shared_ptr<DDSConnector::DdsConnector> m_ddsConnector;
+  QHash<int, User> m_userCont;  // User-Container für Operator-Daten
+};
+
+} // namespace Interface
+} // namespace OperatorManagement
\ No newline at end of file