code: func addOrderFQDNSet(
  	db dbInserter,
  	names []string,
  	orderID int64,
  	regID int64,
  	expires time.Time) error {
  	return db.Insert(&orderFQDNSet{
  		SetHash:        hashNames(names),
  		OrderID:        orderID,
  		RegistrationID: regID,
  		Expires:        expires,
  	})
  }
docs: // addOrderFQDNSet creates a new OrderFQDNSet row using the provided
  // information. This function accepts a transaction so that the orderFqdnSet
  // addition can take place within the order addition transaction. The caller is
  // required to rollback the transaction if an error is returned.