if user is logged in, use that user as default rower

templates/log.html.tera

@@ -38,5 +38,6 @@
             </div>
         </div>
     </div>
+    {% if loggedin_user %}<script>var loggedin_user_id = "{{ loggedin_user.id }}";</script>{% endif %}
     <script src="/public/logbook.js"></script>
 {% endblock content %}