annotate models

WARNING annotators out there, be to run bin/annotate on RAILS_ENV=test on a clean db

app/models/user_warning.rb

@@ -12,8 +12,8 @@ end
 #  topic_id      :integer          not null
 #  user_id       :integer          not null
 #  created_by_id :integer          not null
-#  created_at    :datetime
-#  updated_at    :datetime
+#  created_at    :datetime         not null
+#  updated_at    :datetime         not null
 #
 # Indexes
 #