add WowGuild model

db/migrate/20210528125553_create_wow_guilds.rb

@@ -0,0 +1,21 @@
+class CreateWowGuilds < ActiveRecord::Migration[6.1]
+  def change
+    create_table :wow_guilds do |t|
+      t.string :name
+      t.integer :guild_id
+      t.integer :achievement_points
+      t.integer :member_count
+      t.string :faction
+      t.jsonb :translated_faction
+      t.belongs_to :wow_realm
+
+      t.timestamps
+    end
+
+    add_index :wow_guilds, :guild_id, unique: true
+
+    change_table :wow_characters do |t|
+      t.belongs_to :wow_guild
+    end
+  end
+end