discourse/db/migrate/20120816205537_add_forum_thread_states.rb

class AddForumThreadStates < ActiveRecord::Migration[4.2]
  def change
    add_column :forum_threads, :closed, :boolean, default: false, null: false
    add_column :forum_threads, :sticky, :boolean, default: false, null: false
    add_column :forum_threads, :archived, :boolean, default: false, null: false
  end
end