Implement invitation codes

db/migrate/20240202230325_create_invite_codes.rb

@@ -0,0 +1,9 @@
+class CreateInviteCodes < ActiveRecord::Migration[7.2]
+  def change
+    create_table :invite_codes, id: :uuid do |t|
+      t.string :token, null: false
+
+      t.timestamps
+    end
+  end
+end