I built something similar years ago. These are terribly hard to build, so I did a bit of digging.

1: This appears to be backed by a French company called Linagoria. I don't know much about the company, but they've been around for a bit.

2: I experimented with Mongodb for the similar product, and it turned out to be very unreliable. A lot can change since I used Mongodb, but in general, I'm weary of any product that uses it unless there's an expectation that data is lossy.

(Which was the problem Mongodb had at the time: Their CTO only wanted to target lossy data use cases, but the people interested in using Mondodb wanted a database that was easier to use than SQL.)