Came upon an annoying little bug that only affects WSNs which were originally installed more than a decade ago and upgraded to 9.1. The category parent field was originally a tinyint instead of an int field, and this caused it to be treated as a boolean by the fairly recently added field normalization code, resulting in categories becoming subcategories of category #1 when editing them. Fortunately I'm probably the only one who was affected, but I've added a field type fix to the upgrade script.

Added a processing time check to the unused files cleanup utility so that it splits itself into multiple pages when it's running slowly (as can happen on sites with very large numbers of file attachments).

Fixed a template visual mistake on the listing settings page. Also improved a couple more bootstrap template spots. Probably WSN 10 will default to bootstrap, but will of course continue supporting non-bootstrap themes as well.