diff --git a/backend/.idea/workspace.xml b/backend/.idea/workspace.xml
index cce1f6b..3f81d0a 100644
--- a/backend/.idea/workspace.xml
+++ b/backend/.idea/workspace.xml
@@ -4,18 +4,9 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="3a869f59-290a-4ab2-b036-a878ce801bc4" name="Changes" comment="Fix wrong date">
-      <change afterPath="$PROJECT_DIR$/../frontend/nginx.conf" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/../frontend/proxy.conf.json" afterDir="false" />
+    <list default="true" id="3a869f59-290a-4ab2-b036-a878ce801bc4" name="Changes" comment="Deploy on docker (not productive yet!)">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/resources/application.properties" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/resources/application.properties" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/../docker-compose.yml" beforeDir="false" afterPath="$PROJECT_DIR$/../docker-compose.yml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/../frontend/Dockerfile" beforeDir="false" afterPath="$PROJECT_DIR$/../frontend/Dockerfile" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/../frontend/angular.json" beforeDir="false" afterPath="$PROJECT_DIR$/../frontend/angular.json" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/../frontend/nginx/nginx.conf.template" beforeDir="false" />
-      <change beforePath="$PROJECT_DIR$/../frontend/nginx/run_nginx.sh" beforeDir="false" />
-      <change beforePath="$PROJECT_DIR$/../frontend/src/api/api/schedule.service.ts" beforeDir="false" afterPath="$PROJECT_DIR$/../frontend/src/api/api/schedule.service.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/../openapi.yaml" beforeDir="false" afterPath="$PROJECT_DIR$/../openapi.yaml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/core/services/TaskService.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/core/services/TaskService.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -559,14 +550,21 @@
       <option name="project" value="LOCAL" />
       <updated>1699786723938</updated>
     </task>
-    <option name="localTasksCounter" value="42" />
+    <task id="LOCAL-00042" summary="Deploy on docker (not productive yet!)">
+      <option name="closed" value="true" />
+      <created>1699803821051</created>
+      <option name="number" value="00042" />
+      <option name="presentableId" value="LOCAL-00042" />
+      <option name="project" value="LOCAL" />
+      <updated>1699803821051</updated>
+    </task>
+    <option name="localTasksCounter" value="43" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
     <option name="version" value="3" />
   </component>
   <component name="VcsManagerConfiguration">
-    <MESSAGE value="List missed Schedules" />
     <MESSAGE value="Forget single schedule" />
     <MESSAGE value="Fix marking finished task as overdue" />
     <MESSAGE value="Write simple Testcase for ci/cd" />
@@ -591,7 +589,8 @@
     <MESSAGE value="Update values of datetime picker automatically for editing" />
     <MESSAGE value="Adapt datetime-picker" />
     <MESSAGE value="Fix wrong date" />
-    <option name="LAST_COMMIT_MESSAGE" value="Fix wrong date" />
+    <MESSAGE value="Deploy on docker (not productive yet!)" />
+    <option name="LAST_COMMIT_MESSAGE" value="Deploy on docker (not productive yet!)" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
@@ -611,6 +610,11 @@
           <line>93</line>
           <option name="timeStamp" value="16" />
         </line-breakpoint>
+        <line-breakpoint enabled="true" type="java-line">
+          <url>file://$PROJECT_DIR$/src/main/java/core/services/TaskService.java</url>
+          <line>92</line>
+          <option name="timeStamp" value="35" />
+        </line-breakpoint>
       </breakpoints>
     </breakpoint-manager>
   </component>
diff --git a/backend/src/main/java/core/services/TaskService.java b/backend/src/main/java/core/services/TaskService.java
index 1df8378..d80c784 100644
--- a/backend/src/main/java/core/services/TaskService.java
+++ b/backend/src/main/java/core/services/TaskService.java
@@ -77,11 +77,6 @@ public class TaskService {
             return new ServiceResult<>(ServiceExitCode.INVALID_PARAMETER);
         }
 
-        //Check for invalid date (deadline before start
-        if(taskFieldInfo.getStartDate() != null && taskFieldInfo.getDeadline() != null &&
-                taskFieldInfo.getDeadline().isBefore(taskFieldInfo.getStartDate())) {
-            return new ServiceResult<>(ServiceExitCode.INVALID_PARAMETER);
-        }
         task.setEta(taskFieldInfo.getEta());
         task.setStartDate(taskFieldInfo.getStartDate());
         task.setDeadline(taskFieldInfo.getDeadline());
@@ -91,7 +86,12 @@ public class TaskService {
 
     public void deleteTask(Task task) {
         //taskScheduleService.deleteScheduleByTask(task);
-        taskRepository.deleteByTaskID(task.getTaskID());
+        System.err.println(task.getTaskID());
+        task.getTaskgroup().getTasks().remove(task);
+        taskgroupRepository.save(task.getTaskgroup());
+        task.setTaskgroup(null);
+        taskRepository.save(task);
+        taskRepository.delete(task);
     }
 
     public void clearTasks(Taskgroup taskgroup) {