code: protected boolean deleteMultipleModel(Set<MODEL_ID> idCollection, boolean permanent) throws Exception {
          if (permanent) {
              server.deleteAllPermanent(modelType, idCollection);
          } else {
              server.deleteAll(modelType, idCollection);
          }
          return permanent;
      }
docs: delete multiple Model
  
  @param idCollection model id collection
  @param permanent    a boolean.
  @return if true delete from physical device, if logical delete return false, response status 202
  @throws java.lang.Exception if any.