I'm not that experienced with databases; so exposing the design might be unwise from a security perspective. I'm warm to the idea of open sourcing in the future though. I've only shared repo access with a few trusted engineers. If you think you might want to contribute, hmu ryan at terra dot farm.
I have a very keen interest in the area however! What is most interesting for me recently is how exactly is such data represented in computer structures? Since I know that drawing example graphs and giving good examples would swallow huge amounts of time, I asked if the code is open-source so I could reverse-engineer the data model myself and not pester anyone. =)
I fully understand you not wanting to OSS it yet. I'll be extremely interested if you do that one day in the future.
Hell, if it can be improved to be usable enough and to partially replace a personal nutritionist, one might sell access to it one day.