A rather late reply, but in case anyone is reading this.... Django is basically designed to have sqlite deadlocks, and there's a trivial fix (that the dev team refused to include) that allows fixes the problem and allows you to run up to moderate loads.

https://centraltrunks.blogspot.com/2022/07/django-sqlite-dat...

https://code.djangoproject.com/ticket/29280

(I authored the rant in the first link)