severity 1036167 grave thanks This is worse than just a FTBFS; when the binary package is installed (against versions of python3-flask-sqlalchemy now in stable, testing or unstable), not only is flask-appbuilder completely non-functional as far as I can determing, but even worse it breaks /usr/bin/flask even when not using flask-appbuilder at all.
>From what I can observe, this is at least grave under: makes the package in question unusable or mostly so