- migration: open question type, rubric, max_length, quiz grader and
the grading and review columns of attempt answers
- open answers are checked, stored as pending and never scored on
answer; a changed text resets the grading state
- student JSON gains text, grading_status, grader_feedback,
review_comment, max_length, needs_review and open_answers; the
rubric is never serialized
- Service.Start resumes an open test attempt, closes expired ones at
their deadline and refuses a start past max_attempts under an
advisory lock; StartAttempt stays as a wrapper
- answers to a test are accepted until the deadline plus
golem15.quizzes.test.grace_seconds; one_way answers are final
- a test covers the whole quiz and keeps a stable per-attempt order
- 409 bodies carry a code; list and attempt rows carry attempts_left,
question_types and seconds_left; import accepts the test keys
