chinwagsocial/db/migrate/20171226094803_more_faster_index_on_notifications.rb

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class MoreFasterIndexOnNotifications < ActiveRecord::Migration[5.1]
disable_ddl_transaction!
def change
add_index :notifications, [:account_id, :id], order: { id: :desc }, algorithm: :concurrently
remove_index :notifications, name: :index_notifications_on_id_and_account_id_and_activity_type
end
end