Almost every field in task_table is NULLable, but almost none of them should be.
https://gerrit.beaker-project.org/5955
There is no expected change in behaviour here, so verification should just be that the database migration succeeds (it did) and that nothing else breaks.
Beaker 25.0 has been released. Release notes are available upstream: https://beaker-project.org/docs/whats-new/release-25.html