🚑 hotfix: check if the event is in the past before unseating all participants

Author: ge85riz

backend/src/main/java/com/itestra/eep/services/impl/SeatAllocationServiceImpl.java

@@ -72,6 +72,13 @@ public Map<UUID, List<UUID>> findEmployeeIdsSittingWithAcquaintances(UUID eventI
 
     @Override
     public void unsetAllChairAssignmentsOfEvent(UUID eventId) {
+
+        Event event = eventRepository.findById(eventId).orElseThrow(EventNotFoundException::new);
+
+        if (event.getDate().isBefore(LocalDateTime.now())) {
+            throw new ParticipantOfPastEventException();
+        }
+
         chairRepository.unsetAllEmployeeParticipationChairsByEventId(eventId);
         chairRepository.unsetAllVisitorParticipationChairsByEventId(eventId);
     }