mastodon/db/migrate/20180514140000_revert_index_change_on_statuses_for_api_v1_accounts_account_id_statuses.rb

# frozen_string_literal: true

class RevertIndexChangeOnStatusesForApiV1AccountsAccountIdStatuses < ActiveRecord::Migration[5.2]
  disable_ddl_transaction!

  def change
    safety_assured do
      add_index :statuses, [:account_id, :id, :visibility, :updated_at], order: { id: :desc }, algorithm: :concurrently, name: :index_statuses_20180106 unless index_name_exists?(:statuses, 'index_statuses_20180106')
    end

    # These index may not exists (see migration 20180514130000)
    remove_index :statuses, column: [:account_id, :id, :visibility], where: 'visibility IN (0, 1, 2)', algorithm: :concurrently if index_exists?(:statuses, [:account_id, :id, :visibility], where: 'visibility IN (0, 1, 2)')
    remove_index :statuses, column: [:account_id, :id], where: 'visibility = 3', algorithm: :concurrently if index_exists?(:statuses, %w(account_id id), where: '(visibility = 3)')
  end
end