You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20200506044956_migrate_at_desktop_bookmark_reminders.rb
    path of file: ./repos/discourse/db/migrate
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class MigrateAtDesktopBookmarkReminders < ActiveRecord::Migration[6.0]
  def up

    
  def up
    # reminder_type 0 is at_desktop, which is no longer valid
    DB.exec(<<~SQL, now: Time.zone.now)
        UPDATE bookmarks SET reminder_type = NULL, reminder_at = NULL, updated_at = :now
        WHERE reminder_type = 0
      SQL
  end