# See http://doc.gitlab.com/ce/development/migration_style_guide.html# for more information on how to write migrations for GitLab.classAddLockToIssuables<ActiveRecord::MigrationincludeGitlab::Database::MigrationHelpersDOWNTIME=falsedefupadd_column:issues,:lock_version,:integeradd_column:merge_requests,:lock_version,:integerenddefdownremove_column:issues,:lock_versionremove_column:merge_requests,:lock_versionendend