No — there's no delete option for either in the current admin UI; both screens only ever insert or update a record. Turning off a POS Device's Is Active toggle does retire it: the terminal's device-selection screen only lists devices where Is Active is on, so an inactive device's history stays intact but it disappears from that picker. In the current version, however, the Is Active toggle on a POS Category is not applied when building the POS Terminal's category tabs or the meal editor's Primary Category dropdown — an inactive POS Category still appears as a terminal tab and as a selectable Primary Category, even though it's used to filter it out of some POS reports.