text: -- +migrate Up
  ALTER TABLE `groups`
      MODIFY COLUMN `type` ENUM('Class','Team','Club','Friends','Other','UserSelf','User','Base','ContestParticipants') NOT NULL;
  
  UPDATE `groups` SET `type` = 'User' WHERE `type` = 'UserSelf';
  
  ALTER TABLE `groups`
      MODIFY COLUMN `type` ENUM('Class','Team','Club','Friends','Other','User','Base','ContestParticipants') NOT NULL;
  
  -- +migrate Down
  ALTER TABLE `groups`
      MODIFY COLUMN `type` ENUM('Class','Team','Club','Friends','Other','UserSelf','User','Base','ContestParticipants') NOT NULL;
  
  UPDATE `groups` SET `type` = 'UserSelf' WHERE `type` = 'User';
  
  ALTER TABLE `groups`
      MODIFY COLUMN `type` ENUM('Class','Team','Club','Friends','Other','UserSelf','Base','ContestParticipants') NOT NULL;
  