Earlier quoted context omitted.
DB engine appears to be sqlite. It's in the tags on the main page and there's a file full of sql to create what looks like a sample db in the data/ dir.
Sqlite is fine, could we call this product somehow differently? I don't feel it's database, it's database frontend or smth.
It seems more along the lines of a "headless CMS", which is basically just extensible CRUD often with API endpoints; compare it to Strapi. This one looks finished enough to play around with at least.