Ask HN: How do you implement production-grade draft isolation in Django?

I'm building an open-source LMS with a content studio for instructors — exams, quizzes, assignments, courses.

Hit a wall with preview.

Instructors don't want a fake preview.

They want to actually take the exam they just built — real timer, real submission, real grading, state persisted across requests — then either publish it or throw everything away.

Looked at three options.

PostgreSQL schema separation is conceptually the cleanest but Django migrations get painful fast.

is_draft flags end up as conditionals in every layer.

Snapshot tables can't run real workflows.

What I actually want is pytest-style DB isolation in production.

Persistable, discardable.

Does this exist? How do systems like this usually handle it?