ConsentController.resolveUserId() and DsgvoController.resolveUserId() read
auth.getName() as an email and did findByEmailAndTenantId(...), but JwtAuthFilter
sets the Authentication principal to the userId (UUID) — the JWT subject is the
userId, not the email. So auth.getName() returns a UUID string, the email lookup
never matched, and every consent/dsgvo call threw 'User not found' (404/500).
This made the DSGVO consent banner unusable: /consent/check 404'd (banner always
shown) and clicking Accept POSTed /consent which 500'd with no UI feedback — the
button appeared to 'not react'.
Fix: parse auth.getName() as the userId UUID directly and verify existsById.
Patrick Plate
52251cf711