chore: add annotations to factories and models specs

spec/factories/smtp_endpoint_factory.rb

@@ -1,5 +1,22 @@
 # frozen_string_literal: true
 
+# == Schema Information
+#
+# Table name: smtp_endpoints
+#
+#  id             :integer          not null, primary key
+#  disabled_until :datetime
+#  error          :text(65535)
+#  hostname       :string(255)
+#  last_used_at   :datetime
+#  name           :string(255)
+#  port           :integer
+#  ssl_mode       :string(255)
+#  uuid           :string(255)
+#  created_at     :datetime
+#  updated_at     :datetime
+#  server_id      :integer
+#
 FactoryBot.define do
   factory :smtp_endpoint do
     server