It is easy enough to connect from firebase functions to a cloudsql instance and the pricing is pretty good for the lowest tier (which is also easily scaled up). That said, might as well just use gcp cloud functions instead.
But what I really mean is that it would be cool to have Firebase db access SDKs and realtime capabilities, with a relational, non-proprietary database. If you plug in your CloudSQL or another managed database you don't get that, and have to write everything on your own.
Supabase seems to be going in this direction, and while I haven't tried them yet, I certainly see how it's an attractive proposition.
But what I really mean is that it would be cool to have Firebase db access SDKs and realtime capabilities, with a relational, non-proprietary database. If you plug in your CloudSQL or another managed database you don't get that, and have to write everything on your own.
Supabase seems to be going in this direction, and while I haven't tried them yet, I certainly see how it's an attractive proposition.