apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/AppService.java/AppService/delete
class AppService:  @Transactional
  public void delete(long id, String operator) {
    App app = appRepository.findById(id).orElse(null);
    if (app == null) {
      return;
    }

    app.setDeleted(true);
    app.setDataChangeLastModifiedBy(operator);
    appRepository.save(app);

    auditService.audit(App.class.getSimpleName(), id, Audit.OP.DELETE, operator);
  }