discourse/db/migrate/20191101001705_add_banner_index_to_topics.rb

# frozen_string_literal: true
class AddBannerIndexToTopics < ActiveRecord::Migration[6.0]
  def change
    # this speeds up the process for finding banners on the site
    add_index :topics,
              [:id],
              name: "index_topics_on_id_filtered_banner",
              where: "archetype = 'banner' AND deleted_at IS NULL",
              unique: true
  end
end