- quizzes_create_quiz, update_quiz, delete_quiz (confirm repeats the
slug), publish, unpublish, import_quiz (the existing import route) and
quiz_stats on new manage routes
- stats close expired open test attempts first, then report per student
over completed whole-quiz attempts and per question over every
completed attempt
- input is checked before the database; TestManageAPIAgainstDatabase is
written and skipped under -short
