the same as typing t ef1609f0 modify project:… due:… …. an empty box clears that field.
this is a demo. the data is invented, it is shared with everyone else looking, and it is wiped every night. don't put anything real in it. what is this?
$ tracker ef1609f0-28c1-4b89-bd22-4c4d6b8f1fd5 e