Drush

The Last updated field on projects is set by ECA on save of a Task.

I can bulk re-save with the regular content admin listing, but it's a hassle when there's more than one page.

I think VBO can select all across pages.

Drush has a command for saving all entities of a type.

drush esav.

If I don't do anything, they will get reordered as I update tasks.