make use of the existencechecking annotation for targetrolloutgroup

Signed-off-by: Michael Hirsch <michael.hirsch@bosch-si.com>

hawkbit-repository/src/main/java/org/eclipse/hawkbit/repository/model/RolloutTargetGroup.java

@@ -24,6 +24,9 @@ import javax.persistence.ManyToOne;
 import javax.persistence.OneToMany;
 import javax.persistence.Table;
 
+import org.eclipse.persistence.annotations.ExistenceChecking;
+import org.eclipse.persistence.annotations.ExistenceType;
+
 /**
  * @author Michael Hirsch
  *
@@ -31,6 +34,7 @@ import javax.persistence.Table;
 @IdClass(RolloutTargetGroupId.class)
 @Entity
 @Table(name = "sp_rollouttargetgroup")
+@ExistenceChecking(ExistenceType.ASSUME_NON_EXISTENCE)
 public class RolloutTargetGroup implements Serializable {
 
     private static final long serialVersionUID = 1L;