Add conditional logic to UserRepository save method

The save method in UserRepository.java has been enhanced. If a User object's UUID is not null, then the User is merged to ensure an update takes place, else it's persisted to create a new user record. This preserves data integrity by avoiding possible unintentional user overwrites.

pic-sure-auth-services/src/main/java/edu/harvard/hms/dbmi/avillach/auth/data/repository/UserRepository.java

@@ -236,6 +236,12 @@ public User createOpenAccessUser(Role openAccessRole) {
      * @param user the user to save
      */
     public void save(User user) {
-        em().merge(user);
+        // if user exists update, else create
+        if (user.getUuid() != null) {
+            em().merge(user);
+        } else {
+            em().persist(user);
+        }
     }
+
 }