add webhook events

app/models/webhook_url.rb

@@ -37,6 +37,7 @@ class WebhookUrl < ApplicationRecord
   ].freeze
 
   belongs_to :account
+  has_many :webhook_events, dependent: nil
 
   attribute :events, :string, default: -> { %w[form.viewed form.started form.completed form.declined] }
   attribute :secret, :string, default: -> { {} }