It should be possible to efficiently delete a range of quota IDs, using the same iteration from "lfs quota -a {-u,-g,-p} -s START -e END" to list the actual IDs in the range, and then the code from "lfs quota --delete {-u,-g,-p} ID" to delete each of the present IDs.

Otherwise, when deleting a 100k-ID LQA range that has an unknown number of in-use UID/GID/PROJID, it might need up to 300k individual "lfs quota --delete -u ID" commands to be run, which seems impractical from a usage POV (and probably very slow).