add achievement management

db/migrate/20210814100509_create_wow_achievements.rb

@@ -0,0 +1,21 @@
+class CreateWowAchievements < ActiveRecord::Migration[6.1]
+  def change
+    create_table :wow_achievements do |t|
+      t.integer :achievement_id, null: false
+      t.jsonb :name
+      t.jsonb :description
+      t.integer :points
+      t.boolean :is_account_wide
+      t.integer :display_order
+      t.string :icon
+      t.belongs_to :wow_achievement_category
+      t.belongs_to :wow_achievement_criterium
+
+      t.timestamps
+    end
+
+    add_index :wow_achievements, :achievement_id, unique: true
+
+    add_reference :wow_achievements, :prerequisite_achievement, foreign_key: { to_table: :wow_achievements }
+  end
+end