refactor otp

app/models/otp_challenge.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: otp_challenges
+#
+#  id          :bigint           not null, primary key
+#  attempts    :integer          default(0), not null
+#  expire_at   :datetime         not null
+#  key         :string           not null
+#  nonce       :string           not null
+#  verified_at :datetime
+#  version     :integer          not null
+#  created_at  :datetime         not null
+#
+# Indexes
+#
+#  index_otp_challenges_on_key_and_version  (key,version) UNIQUE
+#
+class OtpChallenge < ApplicationRecord
+end