diff --git a/engine/src/main/java/com/redhat/cloud/notifications/db/repositories/EndpointRepository.java b/engine/src/main/java/com/redhat/cloud/notifications/db/repositories/EndpointRepository.java
index 9b23430286..3c38de1e41 100644
--- a/engine/src/main/java/com/redhat/cloud/notifications/db/repositories/EndpointRepository.java
+++ b/engine/src/main/java/com/redhat/cloud/notifications/db/repositories/EndpointRepository.java
@@ -30,6 +30,7 @@
 import static com.redhat.cloud.notifications.models.EndpointType.EMAIL_SUBSCRIPTION;
 import static com.redhat.cloud.notifications.models.EndpointType.WEBHOOK;
 import static jakarta.persistence.LockModeType.PESSIMISTIC_WRITE;
+import static jakarta.transaction.Transactional.TxType.REQUIRES_NEW;
 
 @ApplicationScoped
 public class EndpointRepository {
@@ -37,6 +38,12 @@ public class EndpointRepository {
     @Inject
     EntityManager entityManager;
 
+    // A new transaction is required because this method is executed from a worker thread.
+    @Transactional(REQUIRES_NEW)
+    public Endpoint getOrCreateDefaultSystemSubscriptionWithNewTransaction(String accountId, String orgId, EndpointType endpointType) {
+        return getOrCreateDefaultSystemSubscription(accountId, orgId, endpointType);
+    }
+
     /**
      * The purpose of this method is to find or create an EMAIL_SUBSCRIPTION or DRAWER endpoint with empty properties. This
      * endpoint is used to aggregate and store in the DB the email or drawer actions outcome, which will be used later by the
diff --git a/engine/src/main/java/com/redhat/cloud/notifications/db/repositories/EventRepository.java b/engine/src/main/java/com/redhat/cloud/notifications/db/repositories/EventRepository.java
index 25a7343601..9758fad529 100644
--- a/engine/src/main/java/com/redhat/cloud/notifications/db/repositories/EventRepository.java
+++ b/engine/src/main/java/com/redhat/cloud/notifications/db/repositories/EventRepository.java
@@ -15,6 +15,8 @@
 import java.util.Map;
 import java.util.UUID;
 
+import static jakarta.transaction.Transactional.TxType.REQUIRES_NEW;
+
 @ApplicationScoped
 public class EventRepository {
 
@@ -97,6 +99,12 @@ public void updateDrawerNotification(Event event) {
                 .executeUpdate();
     }
 
+    // A new transaction is required because this method is executed from a worker thread.
+    @Transactional(REQUIRES_NEW)
+    public void updateEventDisplayNameWithNewTransaction(UUID eventId, String eventTypeDisplayName) {
+        updateEventDisplayName(eventId, eventTypeDisplayName);
+    }
+
     @Transactional
     public void updateEventDisplayName(UUID eventId, String eventTypeDisplayName) {
         String hql = "UPDATE Event SET eventTypeDisplayName = :eventDisplayName WHERE id = :id";
diff --git a/engine/src/main/java/com/redhat/cloud/notifications/processors/email/AsyncAggregation.java b/engine/src/main/java/com/redhat/cloud/notifications/processors/email/AsyncAggregation.java
index 9f597f5c7a..d9a912e418 100644
--- a/engine/src/main/java/com/redhat/cloud/notifications/processors/email/AsyncAggregation.java
+++ b/engine/src/main/java/com/redhat/cloud/notifications/processors/email/AsyncAggregation.java
@@ -7,7 +7,6 @@
 import jakarta.enterprise.context.Dependent;
 import jakarta.enterprise.context.control.ActivateRequestContext;
 import jakarta.inject.Inject;
-import jakarta.transaction.Transactional;
 
 @Dependent
 public class AsyncAggregation implements Runnable {
@@ -29,9 +28,8 @@ public void setEvent(Event event) {
 
     @Override
     @ActivateRequestContext
-    @Transactional
     public void run() {
-        emailSubscriptionTypeProcessor.processAggregationSync(event);
+        emailSubscriptionTypeProcessor.processAggregationSync(event, true);
     }
 
     @PreDestroy
diff --git a/engine/src/main/java/com/redhat/cloud/notifications/processors/email/EmailSubscriptionTypeProcessor.java b/engine/src/main/java/com/redhat/cloud/notifications/processors/email/EmailSubscriptionTypeProcessor.java
index de56fe211e..dffc5fef9a 100644
--- a/engine/src/main/java/com/redhat/cloud/notifications/processors/email/EmailSubscriptionTypeProcessor.java
+++ b/engine/src/main/java/com/redhat/cloud/notifications/processors/email/EmailSubscriptionTypeProcessor.java
@@ -210,11 +210,11 @@ public void processAggregation(Event event) {
                         asyncAggregations.destroy(asyncAggregation);
                     });
         } else {
-            processAggregationSync(event);
+            processAggregationSync(event, false);
         }
     }
 
-    public void processAggregationSync(Event event) {
+    public void processAggregationSync(Event event, boolean async) {
 
         AggregationCommand aggregationCommand;
         Timer.Sample consumedTimer = Timer.start(registry);
@@ -240,9 +240,13 @@ public void processAggregationSync(Event event) {
                         app.get().getDisplayName(),
                         app.get().getBundle().getDisplayName()
                 );
-                eventRepository.updateEventDisplayName(event.getId(), eventTypeDisplayName);
+                if (async) {
+                    eventRepository.updateEventDisplayNameWithNewTransaction(event.getId(), eventTypeDisplayName);
+                } else {
+                    eventRepository.updateEventDisplayName(event.getId(), eventTypeDisplayName);
+                }
             }
-            processAggregateEmailsByAggregationKey(aggregationCommand, Optional.of(event));
+            processAggregateEmailsByAggregationKey(aggregationCommand, Optional.of(event), async);
         } catch (Exception e) {
             Log.warn("Error while processing aggregation", e);
             failedAggregationCommandCount.increment();
@@ -255,7 +259,7 @@ public void processAggregationSync(Event event) {
         }
     }
 
-    private void processAggregateEmailsByAggregationKey(AggregationCommand aggregationCommand, Optional<Event> aggregatorEvent) {
+    private void processAggregateEmailsByAggregationKey(AggregationCommand aggregationCommand, Optional<Event> aggregatorEvent, boolean async) {
         TemplateInstance subject = null;
         TemplateInstance body = null;
         final long startTime = System.currentTimeMillis();
@@ -270,7 +274,12 @@ private void processAggregateEmailsByAggregationKey(AggregationCommand aggregati
             body = templateService.compileTemplate(bodyData, "body");
         }
 
-        Endpoint endpoint = endpointRepository.getOrCreateDefaultSystemSubscription(null, aggregationKey.getOrgId(), EndpointType.EMAIL_SUBSCRIPTION);
+        Endpoint endpoint;
+        if (async) {
+            endpoint = endpointRepository.getOrCreateDefaultSystemSubscriptionWithNewTransaction(null, aggregationKey.getOrgId(), EndpointType.EMAIL_SUBSCRIPTION);
+        } else {
+            endpoint = endpointRepository.getOrCreateDefaultSystemSubscription(null, aggregationKey.getOrgId(), EndpointType.EMAIL_SUBSCRIPTION);
+        }
         Event event;
         if (aggregatorEvent.isEmpty()) {
             event = new Event();