This repository might be of use to anyone finding this issue and looking for a solution, at least until it’s fixed upstream in either Ecto or CockroachDB : GitHub - btkostner/ecto_replay_sandbox: A custom Ecto Sandbox for CockroachDB to run your tests · GitHub - look at the update branch for a version which doesn’t require the cockroachdb adapter.
I was having the same issue as the OP, using this fixed it.
