# See http://doc.gitlab.com/ce/development/migration_style_guide.html# for more information on how to write migrations for GitLab.class<%= migration_class_name %> < ActiveRecord::Migration include Gitlab::Database::MigrationHelpers DOWNTIME =false# When using the methods "add_concurrent_index" or "add_column_with_default"# you must disable the use of transactions as these methods can not run in an# existing transaction. When using "add_concurrent_index" make sure that this# method is the _only_ method called in the migration, any other changes# should go in a separate migration. This ensures that upon failure _only_ the# index creation fails and can be retried or reverted easily.## To disable transactions uncomment the following line and remove these# comments:# disable_ddl_transaction!defchangeendend