This seems more like a limited-lifetime side project rather than an actual viable startup. I've used MongoDB for situations like this where I just need to stuff

This seems more like a limited-lifetime side project rather than an actual viable startup. I've used MongoDB for situations like this where I just need to stuff some simple data into a datastore and retrieve it later without any particularly complicated queries. Personally, if I were the author, I'd switch over to PostgreSQL the second I start worrying about more complex queries, though.