func (h dynamoHandler) save(selection DeliveryDate) (err error) {
      av, err := dynamodbattribute.MarshalMap(selection)
      if err != nil {
          log.WithError(err).Error("failed to marshal selection")
          return
      }

      req := h.db.PutItemRequest(&dynamodb.PutItemInput{
          TableName: aws.String(h.Table),
          Item:      av,
      })
      _, err = req.Send()

      if err != nil {
          log.WithField("table", h.Table).WithError(err).Error("putting dynamodb")
          return
      }
      return
  }

"OrderID (S)","StatusDate (S)","LastUpdated (S)"
"wfr5a","chosen#2019-05-19T13:42:54+08:00","2019-05-19T13:49:34+08:00"
"wfr5a","proposal#2019-05-19T13:42:54+08:00","2019-05-19T13:42:58+08:00"