Hi Mcat,
I've found references to this new backend API/ RESTful service that's supposed to be decoupled from the AdminLTE web UI in your MVP of the new React frontend, as well as multiple references to the rewrite of the API in Discourse topics dating as far back as over a year ago, such as this topic/ reply.
However, I cannot discern whether development of this is API has started yet or not (i.e. you fake the API in the aforementioned MVP), and I've scoured the repos in the Pi-hole GitHub organization for references to the endpoints used in it but they don't exist, and the aforementioned topic mentions the API being written in Python.
Where is this API? Has it even started development? Is it sitting in a private repo somewhere? I'm confused.