What your systems produce Contains PII
19:47:03Bar 2€42.00 · Card ****4821 · Table 7
19:47:41ReceptionCheck-in · Room 412 · S. Morrison
19:48:12SpaBooking · Deep tissue · J. Kowalski
19:48:55Restaurant€118.00 · Table 14 · 4 covers
19:49:20Gate NorthEntry · Ticket #88821 · R. Chen
19:49:44Bar 1€27.00 · Card ****0934 · Table 3
Names, card numbers, room numbers. These do not touch Nexus.
What Nexus holds instead Clean — no identity field exists
zone:"bar-2"·spend:"mid"·cat:"F&B"
zone:"reception"·event:"check-in"
zone:"spa"·event:"booking"·cat:"spa"
zone:"restaurant"·spend:"high"·covers:4
zone:"gate-north"·event:"entry"
zone:"bar-1"·spend:"low"·cat:"F&B"
No name. No card. No room. Only behaviour.