diff --git a/src/main/java/eu/dnetlib/uoaorcidservice/services/MetricsService.java b/src/main/java/eu/dnetlib/uoaorcidservice/services/MetricsService.java
index e4a4861..e422e90 100644
--- a/src/main/java/eu/dnetlib/uoaorcidservice/services/MetricsService.java
+++ b/src/main/java/eu/dnetlib/uoaorcidservice/services/MetricsService.java
@@ -80,14 +80,14 @@ public class MetricsService {
 //    @Scheduled(cron = "0 0 0 * * ?")
 //    // every 5 mins for testing
     @Scheduled(cron = "0 0/5 * * * *")
-    public List<Object> calculateMetrics() {
+    public Metrics calculateMetrics() {
         log.info("Calculate metrics and add them in DB");
 
-        Optional<Metrics> oldMetrics = metricsDAO.findById("current");
-        if(oldMetrics.isPresent()) {
-            oldMetrics.get().setId("previous");
-            metricsDAO.save(oldMetrics.get());
-        }
+//        Optional<Metrics> oldMetrics = metricsDAO.findById("current");
+//        if(oldMetrics.isPresent()) {
+//            oldMetrics.get().setId("previous");
+//            metricsDAO.save(oldMetrics.get());
+//        }
 
         Metrics metrics = new Metrics();
         metrics.setId("current");
@@ -96,14 +96,16 @@ public class MetricsService {
             Map<String, Integer> works = (HashMap<String, Integer>) totalWorks.get(0);
             metrics.setTotal_works(works.get("works"));
         } else {
-            metrics.setTotal_works(0);
+            metrics.setTotal_works(-1);
+            return metrics;
         }
         List<Object> totalUsers = countTotalUniqueUsers();
         if(totalUsers != null && totalUsers.get(0) != null) {
             Map<String, Integer> users = (HashMap<String, Integer>) totalUsers.get(0);
             metrics.setTotal_users(users.get("users"));
         } else {
-            metrics.setTotal_users(0);
+            metrics.setTotal_users(-1);
+            return metrics;
         }
 //        metrics.setWorks_per_month(countWorksPerYearAndMonth());
         List<Object> works_per_dashboard = countWorksPerDashboard();
@@ -125,7 +127,7 @@ public class MetricsService {
 //        Total users: (unique/ per orcid): http://duffy.di.uoa.gr:8080/uoa-orcid-service/report/totalUniqueUsers
 //        Works linked per month: http://duffy.di.uoa.gr:8080/uoa-orcid-service/report/worksPerYearAndMonth (not needed?)
 //        Works linked per portal (not only explore): http://duffy.di.uoa.gr:8080/uoa-orcid-service/report/worksPerDashboard
-        return totalWorks;
+        return metrics;
     }
 
     public String getMetrics() {