Ticket checkout warnings

[marksteward]

We're seeing a bunch of these:

Apr 02 16:50:14 heaviside 4585d8fde946[1029]: 2026-04-02 16:50:14,235 main         WARNING  36 59vzutti     User has no reservations, enforcing unavailable state
Apr 02 16:50:15 heaviside 4585d8fde946[1029]: 2026-04-02 16:50:15,034 main         WARNING  37 59vzutti     User has no reservations, enforcing unavailable state
Apr 02 16:50:15 heaviside 4585d8fde946[1029]: 2026-04-02 16:50:15,839 main         WARNING  39 59vzutti     User has no reservations, enforcing unavailable state

Hitting this line should be impossible without a voucher.

We're also seeing a load of these:

Apr 02 16:51:11 heaviside 4585d8fde946[1029]: 2026-04-02 16:51:11,386 main         WARNING  37 5m8azmx3     Not all IDs returned from database
Apr 02 16:51:24 heaviside 4585d8fde946[1029]: 2026-04-02 16:51:24,140 main         WARNING  38 5m8azmx3     Not all IDs returned from database
Apr 02 16:51:27 heaviside 4585d8fde946[1029]: 2026-04-02 16:51:27,206 main         WARNING  38 5m8azmx3     Not all IDs returned from database

which either means someone's got some spurious entries in their basket or my logic is wrong.