I’m pretty sure everything you need can be achieved in Elixir/Phoenix, yet, I must say, I have no experience with it.
Having said that, if instead of calling Repo in your project, you do something akin to get_repo(user, team), where you lazy create that database if it doesn’t exist (and check permissions to access), that should sandboxed enough.
If you think about it, it’s much more secure than other approaches, where a web framework defaults to a db connection. Here, every, single, time, you need to explicitly tell elixir what database to use, by calling a configured Repo (you can configure more than one).
