diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
index 238b7e5..779ce6d 100644
--- a/.vscode/c_cpp_properties.json
+++ b/.vscode/c_cpp_properties.json
@@ -4,8 +4,7 @@
             "name": "Linux",
             "includePath": [
                 "${workspaceFolder}/**",
-                "/usr/include/qt",
-                "/usr/include/qt/QtWidgets"
+                "/usr/include/qt"
             ],
             "defines": [],
             "compilerPath": "/usr/bin/clang",
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 2c7f713..78113b5 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -3,6 +3,11 @@
 find_package(Boost 1.62 COMPONENTS date_time REQUIRED)
 find_package(SQLite3 REQUIRED)
 
+#set(CORE_HEADERS
+#    entity.h
+#    database.h
+#)
+
 set(CORE_SOURCES
     database.cpp
     entity.cpp
@@ -14,5 +19,4 @@ set(CORE_SOURCES
 
 add_library(core STATIC ${CORE_SOURCES})
 target_link_libraries(core Boost::boost Boost::date_time)
-target_link_libraries(core sqlite3)
-target_include_directories(core PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
\ No newline at end of file
+target_link_libraries(core sqlite3)
\ No newline at end of file
diff --git a/src/gui/kima2.cpp b/src/gui/kima2.cpp
index cb210ef..372e273 100644
--- a/src/gui/kima2.cpp
+++ b/src/gui/kima2.cpp
@@ -1,7 +1,5 @@
 #include "mainwindow.h"
 
-#include <memory>
-
 #include <QApplication>
 
 
@@ -11,8 +9,8 @@ int main(int argc, char* argv[])
 
     QApplication kimaApp{argc, argv};
 
-    auto mainWin = std::make_unique<MainWindow>();
-    mainWin->show();
+    MainWindow mainWin{};
+    mainWin.show();
 
     return kimaApp.exec();
 }
diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index d352cfe..c94ac19 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -2,10 +2,5 @@
 
 MainWindow::MainWindow()
 {
-    ui_.setupUi(this);
-
-    connect(ui_.actionQuit, &QAction::triggered, qApp, QApplication::quit);
-
-    marketplace_ = std::make_unique<Marketplace>();
-}
-
+    ui.setupUi(this);
+}
\ No newline at end of file
diff --git a/src/gui/mainwindow.h b/src/gui/mainwindow.h
index 943382c..2cc3dad 100644
--- a/src/gui/mainwindow.h
+++ b/src/gui/mainwindow.h
@@ -1,13 +1,9 @@
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H
 
-#include <marketplace.h>
-
 #include "ui_mainwindow.h"
 #include <QMainWindow>
 
-#include <memory>
-
 class MainWindow : public QMainWindow
 {
     Q_OBJECT
@@ -16,8 +12,7 @@ class MainWindow : public QMainWindow
     MainWindow();
 
     private:
-        Ui::MainWindow ui_;
-        std::unique_ptr<Marketplace> marketplace_;
+        Ui::MainWindow ui;
 };
 
 #endif
\ No newline at end of file
diff --git a/src/gui/mainwindow.ui b/src/gui/mainwindow.ui
index 79a4517..ca4bfd5 100644
--- a/src/gui/mainwindow.ui
+++ b/src/gui/mainwindow.ui
@@ -23,36 +23,8 @@
      <height>24</height>
     </rect>
    </property>
-   <widget class="QMenu" name="menu_Datei">
-    <property name="title">
-     <string>&amp;Datei</string>
-    </property>
-    <addaction name="actionQuit"/>
-   </widget>
-   <widget class="QMenu" name="menu_Edit">
-    <property name="title">
-     <string>&amp;Bearbeiten</string>
-    </property>
-    <addaction name="actionEditSeller"/>
-   </widget>
-   <addaction name="menu_Datei"/>
-   <addaction name="menu_Edit"/>
   </widget>
   <widget class="QStatusBar" name="statusbar"/>
-  <action name="actionQuit">
-   <property name="icon">
-    <iconset theme="application-exit">
-     <normaloff>.</normaloff>.</iconset>
-   </property>
-   <property name="text">
-    <string>&amp;Beenden</string>
-   </property>
-  </action>
-  <action name="actionEditSeller">
-   <property name="text">
-    <string>&amp;Verkäufer...</string>
-   </property>
-  </action>
  </widget>
  <resources/>
  <connections/>
diff --git a/src/gui/sellerdialog.ui b/src/gui/sellerdialog.ui
deleted file mode 100644
index b789849..0000000
--- a/src/gui/sellerdialog.ui
+++ /dev/null
@@ -1,115 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<ui version="4.0">
- <class>sellerDialog</class>
- <widget class="QDialog" name="sellerDialog">
-  <property name="windowModality">
-   <enum>Qt::NonModal</enum>
-  </property>
-  <property name="geometry">
-   <rect>
-    <x>0</x>
-    <y>0</y>
-    <width>400</width>
-    <height>300</height>
-   </rect>
-  </property>
-  <property name="windowTitle">
-   <string>Verkäufer Dialog</string>
-  </property>
-  <property name="modal">
-   <bool>true</bool>
-  </property>
-  <layout class="QVBoxLayout" name="verticalLayout">
-   <item>
-    <layout class="QHBoxLayout" name="horizontalLayout">
-     <item>
-      <widget class="QTableView" name="tableView"/>
-     </item>
-     <item>
-      <layout class="QVBoxLayout" name="verticalLayout_2">
-       <item>
-        <widget class="QPushButton" name="newButton">
-         <property name="text">
-          <string>Neu</string>
-         </property>
-        </widget>
-       </item>
-       <item>
-        <widget class="QPushButton" name="editButton">
-         <property name="text">
-          <string>Bearbeiten</string>
-         </property>
-        </widget>
-       </item>
-       <item>
-        <widget class="QPushButton" name="deleteButton">
-         <property name="text">
-          <string>Löschen</string>
-         </property>
-        </widget>
-       </item>
-       <item>
-        <spacer name="verticalSpacer">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>20</width>
-           <height>40</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
-      </layout>
-     </item>
-    </layout>
-   </item>
-   <item>
-    <widget class="QDialogButtonBox" name="buttonBox">
-     <property name="orientation">
-      <enum>Qt::Horizontal</enum>
-     </property>
-     <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
-     </property>
-    </widget>
-   </item>
-  </layout>
- </widget>
- <resources/>
- <connections>
-  <connection>
-   <sender>buttonBox</sender>
-   <signal>accepted()</signal>
-   <receiver>sellerDialog</receiver>
-   <slot>accept()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>248</x>
-     <y>254</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>157</x>
-     <y>274</y>
-    </hint>
-   </hints>
-  </connection>
-  <connection>
-   <sender>buttonBox</sender>
-   <signal>rejected()</signal>
-   <receiver>sellerDialog</receiver>
-   <slot>reject()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>316</x>
-     <y>260</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>286</x>
-     <y>274</y>
-    </hint>
-   </hints>
-  </connection>
- </connections>
-</ui>