docs: def WaitProcessing(obj, eng, callbacks, exc_info):
          """Take actions when WaitProcessing is raised.
  
          ..note::
              We're essentially doing HaltProcessing, plus `obj.set_action` and
              object status `WAITING` instead of `HALTED`.
  
              This is not present in TransitionActions so that's why it is not
              calling super in this case.
          """
          e = exc_info[1]
          obj.set_action(e.action, e.message)
          obj.save(status=eng.object_status.WAITING,
                   callback_pos=eng.state.callback_pos,
                   id_workflow=eng.uuid)
          eng.save(WorkflowStatus.HALTED)
          eng.log.warning("Workflow '%s' waiting at task %s with message: %s",
                          eng.name, eng.current_taskname or "Unknown", e.message)
          db.session.commit()
  
          # Call super which will reraise
          TransitionActions.HaltProcessing(
              obj, eng, callbacks, exc_info
          )