db/migrate/20160808085602_add_index_for_build_token.rb


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class AddIndexForBuildToken < ActiveRecord::Migration
  include Gitlab::Database::MigrationHelpers

  # Set this constant to true if this migration requires downtime.
  DOWNTIME = false

  disable_ddl_transaction!

  def change
    add_concurrent_index :ci_builds, :token, unique: true
  end
end