# See http://doc.gitlab.com/ce/development/migration_style_guide.html# for more information on how to write migrations for GitLab.classRemoveUserAuthenticationToken<ActiveRecord::MigrationincludeGitlab::Database::MigrationHelpersDOWNTIME=falsedisable_ddl_transaction!defupremove_column:users,:authentication_tokenenddefdownadd_column:users,:authentication_token,:stringadd_concurrent_index:users,:authentication_token,unique: trueendend