Other than the 6 Theorys at the top of my
Errors page, which are simple No-Subtasks errors which should ultimately clear, I have 10 orphan Sixtracks from 28 Apr, 4 Theorys from 3-4 Feb and
3 Invalids from August '17
Valid, credited tasks seem to get purged after some period of time (my oldest Valid is 30th Jan'18) but Errors and Invalids seem to hang about for longer than necessary.