Insert Category
Log into mongodb
mongosh mongodb://<username>:<password>@localhost:30000/metahkg
Check for categories
metahkg> db.category.find().pretty()
Use an id that does not exist yet in the next step.
Insert
metahkg> db.category.insertOne({ id: <newid>, name: "<new-category-name>" })
// normal category
metahkg> db.category.insertOne({ id: <newid>, name: "<new-category-name>", hidden: true })
// hidden category
Reload the app and you should now see the new category.