add achievement management

db/migrate/20210815101616_add_wow_criterium_self_join.rb

@@ -0,0 +1,5 @@
+class AddWowCriteriumSelfJoin < ActiveRecord::Migration[6.1]
+  def change
+    add_reference :wow_achievement_criteria, :parent_criterium, foreign_key: { to_table: :wow_achievement_criteria }
+  end
+end