db/migrate/20160616103948_add_unique_index_to_keys_fingerprint.rb


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

  disable_ddl_transaction!

  def up
    add_concurrent_index :keys, :fingerprint, unique: true
  end

  def down
    remove_index :keys, :fingerprint
  end
end