Cloud stored relational database

Hi,

Is there a solution to integrate a cloud stored database in a unity based app?

I've been exploring a bit and at first I thought I would go for Firebase, but after doing some reseach I found out it is not a relational database and it has very limited query capabilities.

I also found that there was a Unity Cloud DB under developement but it was dropped...

Also after going through the asset store I found stuff like SimpleSQl or RsDB, but soon found that they are locally stored and that crushes the main goal, which is to provide a service that can be purchased and used by diffeent users of the same company working against the same db.

I've been postponing my initiation in unity for quite a while now (years) and thought this project would be a great excuse to finally get into it so thanks for any help!