diff --git a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/AbstractDaoImpl.java b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/AbstractDaoImpl.java
index 1f9cf88..0fb4a22 100644
--- a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/AbstractDaoImpl.java
+++ b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/AbstractDaoImpl.java
@@ -1,5 +1,6 @@
 package de.kreth.vaadin.clubhelper.vaadinclubhelper.dao;
 
+import java.util.Date;
 import java.util.List;
 
 import javax.persistence.EntityManager;
@@ -14,6 +15,8 @@ import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.EntityAccessor;
 
 public abstract class AbstractDaoImpl<T extends EntityAccessor> implements IDao<T> {
 
+	private static final long serialVersionUID = 7886744143287550291L;
+
 	protected final Logger log = LoggerFactory.getLogger(getClass());
 
 	@Autowired
@@ -28,9 +31,12 @@ public abstract class AbstractDaoImpl<T extends EntityAccessor> implements IDao<
 	@Override
 	@Transactional
 	public void save(T obj) {
+		Date now = new Date();
+		obj.setChanged(now);
 		if (entityManager.contains(obj) || obj.hasValidId()) {
 			entityManager.merge(obj);
 		} else {
+			obj.setCreated(now);
 			entityManager.persist(obj);
 		}
 	}
diff --git a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/AltersgruppeDaoImpl.java b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/AltersgruppeDaoImpl.java
index 3d13e77..2886130 100644
--- a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/AltersgruppeDaoImpl.java
+++ b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/AltersgruppeDaoImpl.java
@@ -7,6 +7,8 @@ import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.Altersgruppe;
 @Repository
 public class AltersgruppeDaoImpl extends AbstractDaoImpl<Altersgruppe> implements AltersgruppeDao {
 
+	private static final long serialVersionUID = 746136196155133506L;
+
 	public AltersgruppeDaoImpl() {
 		super(Altersgruppe.class);
 	}
diff --git a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/ClubEventDaoImpl.java b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/ClubEventDaoImpl.java
index 664bf1d..7d669c7 100644
--- a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/ClubEventDaoImpl.java
+++ b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/ClubEventDaoImpl.java
@@ -19,6 +19,8 @@ import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.Person;
 @Transactional
 public class ClubEventDaoImpl extends AbstractDaoImpl<ClubEvent> implements ClubEventDao {
 
+	private static final long serialVersionUID = 7648111697282525347L;
+
 	public ClubEventDaoImpl() {
 		super(ClubEvent.class);
 	}
diff --git a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/GroupDaoImpl.java b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/GroupDaoImpl.java
index 9ec15a8..6d9f5f2 100644
--- a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/GroupDaoImpl.java
+++ b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/GroupDaoImpl.java
@@ -5,9 +5,9 @@ import org.springframework.stereotype.Repository;
 import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.GroupDef;
 
 @Repository
-public class GroupDaoImpl extends AbstractDaoImpl<GroupDef>
-		implements
-			GroupDao {
+public class GroupDaoImpl extends AbstractDaoImpl<GroupDef> implements GroupDao {
+
+	private static final long serialVersionUID = -6675545206382142963L;
 
 	public GroupDaoImpl() {
 		super(GroupDef.class);
diff --git a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/IDao.java b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/IDao.java
index 737a2e2..9a2a1c7 100644
--- a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/IDao.java
+++ b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/IDao.java
@@ -1,8 +1,9 @@
 package de.kreth.vaadin.clubhelper.vaadinclubhelper.dao;
 
+import java.io.Serializable;
 import java.util.List;
 
-public interface IDao<T> {
+public interface IDao<T> extends Serializable {
 
 	void save(T obj);
 
diff --git a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/PersonDaoImpl.java b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/PersonDaoImpl.java
index ac55dbc..16ad967 100644
--- a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/PersonDaoImpl.java
+++ b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/PersonDaoImpl.java
@@ -18,6 +18,8 @@ import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.Startpass;
 @Repository
 public class PersonDaoImpl extends AbstractDaoImpl<Person> implements PersonDao {
 
+	private static final long serialVersionUID = -5809935282146356282L;
+
 	public PersonDaoImpl() {
 		super(Person.class);
 	}
diff --git a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/PflichtenDaoImpl.java b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/PflichtenDaoImpl.java
index 94438a3..0bf77f6 100644
--- a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/PflichtenDaoImpl.java
+++ b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/dao/PflichtenDaoImpl.java
@@ -9,6 +9,8 @@ import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.Pflicht;
 @Transactional
 public class PflichtenDaoImpl extends AbstractDaoImpl<Pflicht> implements PflichtenDao {
 
+	private static final long serialVersionUID = 5660723465403552334L;
+
 	public PflichtenDaoImpl() {
 		super(Pflicht.class);
 	}
diff --git a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/EventDetails.java b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/EventDetails.java
index cb76201..ba9ec4f 100644
--- a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/EventDetails.java
+++ b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/EventDetails.java
@@ -17,7 +17,6 @@ import de.kreth.vaadin.clubhelper.vaadinclubhelper.dao.GroupDao;
 import de.kreth.vaadin.clubhelper.vaadinclubhelper.dao.PersonDao;
 import de.kreth.vaadin.clubhelper.vaadinclubhelper.dao.PflichtenDao;
 import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.ClubEvent;
-import de.kreth.vaadin.clubhelper.vaadinclubhelper.security.SecurityVerifier;
 import de.kreth.vaadin.clubhelper.vaadinclubhelper.ui.components.EventAltersgruppen;
 import de.kreth.vaadin.clubhelper.vaadinclubhelper.ui.components.PersonGrid;
 import de.kreth.vaadin.clubhelper.vaadinclubhelper.ui.components.SingleEventView;
@@ -31,21 +30,19 @@ public class EventDetails extends GridLayout implements NamedView {
 	private final PersonDao personDao;
 	private final GroupDao groupDao;
 	private final PflichtenDao pflichtenDao;
-	private final SecurityVerifier securityGroupVerifier;
 
 	private ClubEvent currentEvent;
 	private SingleEventView eventView;
 	private PersonGrid personGrid;
 	private EventAltersgruppen eventAltersgruppen;
 
-	public EventDetails(PersonDao personDao, GroupDao groupDao, EventBusiness eventBusiness, PflichtenDao pflichtenDao,
-			SecurityVerifier securityGroupVerifier) {
+	public EventDetails(PersonDao personDao, GroupDao groupDao, EventBusiness eventBusiness,
+			PflichtenDao pflichtenDao) {
 		super(3, 5);
 		this.eventBusiness = eventBusiness;
 		this.personDao = personDao;
 		this.groupDao = groupDao;
 		this.pflichtenDao = pflichtenDao;
-		this.securityGroupVerifier = securityGroupVerifier;
 	}
 
 	@Override
diff --git a/src/main/resources/schema/version1.sql b/src/main/resources/schema/version1.sql
index 476eb69..c0708e1 100644
--- a/src/main/resources/schema/version1.sql
+++ b/src/main/resources/schema/version1.sql
@@ -4,7 +4,7 @@ CREATE TABLE `pflichten` (
   `fixed` TINYINT NULL,
   `ordered` INT NOT NULL,
   `comment` VARCHAR(500) NULL,
-  `changed` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `changed` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
   `created` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
   `deleted` DATETIME NULL DEFAULT NULL,
   PRIMARY KEY (`id`),
@@ -17,7 +17,7 @@ CREATE TABLE `altersgruppe` (
   `bezeichnung` VARCHAR(100) NOT NULL,
   `start` INT NULL,
   `end` VARCHAR(45) NULL,
-  `changed` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  `changed` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   `created` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
   `deleted` DATETIME NULL DEFAULT NULL,
   PRIMARY KEY (`id`),
@@ -64,51 +64,51 @@ CREATE TABLE `clubhelper`.`clubevent_addon` (
     ON UPDATE NO ACTION);
 
 ALTER TABLE `adress` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 ALTER TABLE `altersgruppe` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 ALTER TABLE `attendance` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 ALTER TABLE `contact` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 ALTER TABLE `deleted_entries` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 ALTER TABLE `groupdef` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 ALTER TABLE `person` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 ALTER TABLE `persongroup` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 ALTER TABLE `pflichten` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 ALTER TABLE `relative` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 ALTER TABLE `startpaesse` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 ALTER TABLE `startpass_startrechte` 
-CHANGE COLUMN `changed` `changed` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
+CHANGE COLUMN `changed` `changed` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
 CHANGE COLUMN `created` `created` DATETIME NULL DEFAULT CURRENT_TIMESTAMP ;
 
 UPDATE `clubhelper`.`version` SET `version` = '12' WHERE (`id` = '1');
\ No newline at end of file