add webhook events

app/models/webhook_attempt.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: webhook_attempts
+#
+#  id                   :bigint           not null, primary key
+#  attempt              :integer          not null
+#  response_body        :text
+#  response_status_code :integer          not null
+#  created_at           :datetime         not null
+#  updated_at           :datetime         not null
+#  webhook_event_id     :bigint           not null
+#
+# Indexes
+#
+#  index_webhook_attempts_on_webhook_event_id  (webhook_event_id)
+#
+class WebhookAttempt < ApplicationRecord
+  belongs_to :webhook_event
+
+  def success?
+    response_status_code.to_i / 100 == 2
+  end
+end