The bouncer's tool, not the feed. Info-dense and readable at arm's length in the dark, with one hand, while a queue waits. The loud moment here is the verdict, not the branding.
Notes. A scan or a typed code resolves against attendance for
this event only. The first hit flips checked_in_at and increments the counter;
a second hit returns the red Already used reject — codes are single-use, enforced with
SELECT … FOR UPDATE so two doors can't both admit the same code. The tool runs under an
assigned door-staff identity, and every check-in records which device performed it.