Some dbs require that all tables have primary keys, see
- #16802
- #21086
We can add a test to keep it from being broken again.
Edit:
~Added missing primary key for `ForeignReference`~ Dropped the
`ForeignReference` table to satisfy the check, so it closes #21086.
More context can be found in comments.
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: zeripath <art27@cantab.net>
