custom licenses not showing up in the dropdown

[LesterLyu]

Custom licenses do not all show up in the dropdown. Reboot fixed it.
Adding new custom license with the existing ID (not showing up in the dropdown) tells "id existed".
The creation of new licenses works but never shows up in the licenses dropdown. After a server reboot is shows up all the licenses but many of them have a duplicated name/url.

Could be

• multithreaded issue in the production site with uwsgi
  • states of each thread/process are not synced.
  • process forked before adding new custom license and the forked process is destroyed.
• Bugged because of server slowness

TODOs:

• Refactor the code and make the APIs stateless, do not store states in the memory.
• Add Licences Management in the admin dashboard, and make deletion of duplicated licenses possible.