Great post! Regarding the database, would the fixture possibly benefit from creating a single database in postgres, and then making copies of it for each worker using <a href="https://www.postgresql.org/docs/current/manage-ag-templatedbs.html" rel="nofollow">https://www.postgresql.org/docs/current/manage-ag-templatedb...</a>? Then it doesn't need to run the migration lots of times. Possibly even faster than the squashed migration?