This finsishes the work started on #16803.
Thanks Simon Charette, Tim Graham and Collin Anderson for the
reviews.

Refs #15101. Patch slightly reworked by Claude Paroz.

Thanks Josh Smeaton and Tim Graham for the reviews.

Thanks Josh Smeaton for the review. Refs #24152.

Thanks Simon and Markus for reviews.

Thanks Tim Graham for the report

refs #24031

Thanks to Tim Graham and Michał Modzelewski for the review.

Fixed #24075 -- Prevented running post_migrate signals when unapplying initial migrations of contenttypes and auth

Thanks Florian Apolloner for the report and Claude Paroz and Tim Graham for the review and help on the patch.

Thanks Tim Graham for the review.

This is a security fix. Disclosure following shortly.

Thanks Keryn Knight for the report and initial patch.

This issue was fixed in master by refs #24072.

This is a security fix. Disclosure following shortly.

This is a security fix. Disclosure following shortly.

Thanks to Jedediah Smith for the report.

Thanks Max Demars for the report.

Refs #17785

Thanks Laurent Payot for the report, and Markus Holtermann, Tim Graham
for the reviews.