Once you change the XML schema or Hjson, you need to regenerate the code to actually see the changes in the Backend and the API.
Simply run:
sysadmin@apigoat:/var/www/gc/p/project1$ gc b
You will be asked:
Do you want to backup the current data: [Y]es, [n]o)
If you choose Yes, the database will be restore as it is now after the build.
If you choose No, the last database backup will be restored.