diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/AbstractPingIndicator.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/AbstractPingIndicator.java
index 883fef76..4d6d9996 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/AbstractPingIndicator.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/AbstractPingIndicator.java
@@ -15,6 +15,9 @@ import java.util.Collections;
 import java.util.EnumSet;
 import java.util.Set;
 
+import org.joda.time.DateTime;
+import org.joda.time.DateTimeZone;
+
 import com.fasterxml.jackson.annotation.JsonIgnore;
 
 import ch.ethz.seb.sebserver.gbl.model.session.ClientEvent.EventType;
@@ -27,6 +30,7 @@ public abstract class AbstractPingIndicator extends AbstractClientIndicator {
 
     private final ClientEventExtentionMapper clientEventExtentionMapper;
 
+    protected long pingLatency;
     protected int pingCount = 0;
     protected int pingNumber = 0;
 
@@ -35,14 +39,16 @@ public abstract class AbstractPingIndicator extends AbstractClientIndicator {
         this.clientEventExtentionMapper = clientEventExtentionMapper;
     }
 
-    public void notifyPing(final long timestamp, final int pingNumber) {
-        super.currentValue = timestamp;
+    public final void notifyPing(final long timestamp, final int pingNumber) {
+        final long now = DateTime.now(DateTimeZone.UTC).getMillis();
+        this.pingLatency = now - timestamp;
+        super.currentValue = now;
         this.pingCount++;
         this.pingNumber = pingNumber;
     }
 
     @Override
-    public double computeValueAt(final long timestamp) {
+    public final double computeValueAt(final long timestamp) {
         if (this.cachingEnabled) {
             return timestamp;
         } else {
diff --git a/src/main/resources/config/application.properties b/src/main/resources/config/application.properties
index 1233764e..09fc503e 100644
--- a/src/main/resources/config/application.properties
+++ b/src/main/resources/config/application.properties
@@ -5,6 +5,6 @@ spring.mandatory-file-encoding=UTF-8
 spring.http.encoding.charset=UTF-8
 spring.http.encoding.enabled=true
 
-sebserver.version=0.3.4 pre-beta
+sebserver.version=0.3.5 pre-beta
 sebserver.supported.languages=en,de
 
diff --git a/src/main/resources/schema-demo.sql b/src/main/resources/schema-demo.sql
index dcc10d47..85a0e419 100644
--- a/src/main/resources/schema-demo.sql
+++ b/src/main/resources/schema-demo.sql
@@ -391,7 +391,8 @@ CREATE TABLE IF NOT EXISTS `oauth_access_token` (
   `user_name` VARCHAR(255) NULL,
   `client_id` VARCHAR(255) NULL,
   `authentication` BLOB NULL,
-  `refresh_token` VARCHAR(255) NULL)
+  `refresh_token` VARCHAR(255) NULL,
+  UNIQUE INDEX `authentication_id_UNIQUE` (`authentication_id` ASC))
 ;
 
 
diff --git a/src/test/java/ch/ethz/seb/sebserver/HTTPClientBot.java b/src/test/java/ch/ethz/seb/sebserver/HTTPClientBot.java
index e328f6ff..cf8f59ba 100644
--- a/src/test/java/ch/ethz/seb/sebserver/HTTPClientBot.java
+++ b/src/test/java/ch/ethz/seb/sebserver/HTTPClientBot.java
@@ -78,7 +78,9 @@ public class HTTPClientBot {
 
     public HTTPClientBot(final Map<String, String> args) {
 
+        //this.webserviceAddress = args.getOrDefault("webserviceAddress", "http://ralph.ethz.ch:8080");
         this.webserviceAddress = args.getOrDefault("webserviceAddress", "http://localhost:8080");
+
         this.accessTokenEndpoint = args.getOrDefault("accessTokenEndpoint", "/oauth/token");
         this.clientId = args.getOrDefault("clientId", "TO_SET");
         this.clientSecret = args.getOrDefault("clientSecret", "TO_SET");
diff --git a/src/test/resources/schema-test.sql b/src/test/resources/schema-test.sql
index 0d960732..c920c842 100644
--- a/src/test/resources/schema-test.sql
+++ b/src/test/resources/schema-test.sql
@@ -397,10 +397,10 @@ CREATE TABLE IF NOT EXISTS `oauth_access_token` (
   `user_name` VARCHAR(255) NULL,
   `client_id` VARCHAR(255) NULL,
   `authentication` BLOB NULL,
-  `refresh_token` VARCHAR(255) NULL)
+  `refresh_token` VARCHAR(255) NULL,
+  UNIQUE INDEX `authentication_id_UNIQUE` (`authentication_id` ASC))
 ;
 
-
 -- -----------------------------------------------------
 -- Table `oauth_refresh_token`
 -- -----------------------------------------------------