db/migrate/20170419001229_add_index_to_system_note_metadata.rb


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

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

  disable_ddl_transaction!

  def up
    # MySQL automatically creates an index on a foreign-key constraint; PostgreSQL does not
    add_concurrent_index :system_note_metadata, :note_id, unique: true if Gitlab::Database.postgresql?
  end

  def down
    remove_concurrent_index :system_note_metadata, :note_id, unique: true if Gitlab::Database.postgresql?
  end
end