gitlab-org--gitlab-foss/db/migrate/20161124111395_add_index_to_parent_id.rb

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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class AddIndexToParentId < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
def change
add_concurrent_index(:namespaces, [:parent_id, :id], unique: true)
end
end