ets has an Ecto wrapper

ets is the bare bones no persistence storage mechanism that has lived inside Erlang for decades.
It’s not pretty but does its job well.

Today I found etso a bare-bones Ecto wrapper for ets.
This does allow possibilities for rapid prototyping of systems.
You can see if the database structure makes sense without actually having to create the database.

Possibilities here get interesting. For example you could point a generator at openapi and have a system that implements the spec without ever touching a disk.