✨ Made survey fetch operation transactional

Author: Pa-Touche

sormas-backend/src/main/java/de/symeda/sormas/backend/externalmessage/ExternalMessageFacadeEjb.java

@@ -50,6 +50,7 @@
 import javax.persistence.criteria.Predicate;
 import javax.persistence.criteria.Root;
 import javax.persistence.criteria.Selection;
+import javax.transaction.Transactional;
 import javax.validation.Valid;
 import javax.validation.constraints.NotNull;
 
@@ -329,6 +330,9 @@ private ExternalMessageDto saveWithFallback(ExternalMessageDto dto) {
 
 	@Override
 	@RightsAllowed(UserRight._EXTERNAL_MESSAGE_SURVEY_RESPONSE_PROCESS)
+	@Transactional(value = Transactional.TxType.REQUIRES_NEW,
+		rollbackOn = {
+			Exception.class })
 	public List<ExternalMessageDto> saveAndProcessSurveyResponses(Date since) {
 
 		if (since == null) {