Haven't played around with Fly yet, but it seems amazingly well-suited to LiveView apps and y'all seem like great people in general. Is there a Fly solution for if someone needed a big swinging...database? I guess one fear is getting locked into Fly + LiveView given latency concerns with alternative hosting providers, but outgrowing Fly's database offerings.
Our Postgres is pretty great up to about 500GB. We'll be pushing that higher over the next year, but we have several customers using Crunchy Data (https://www.crunchydata.com/products/crunchy-bridge/) in conjunction with their Fly.io apps.
We intentionally give you super user access to your DBs so it's easy to migrate or spin up your own replicas. Our bet is that _most_ people won't outgrow our Postgres but having an escape hatch is still very comforting.
We previously worked on Compose.com. We, at least, understand how to manage huge databases when the time comes.