Fix: Team registrations are now checked for duplicates only for the current event

src/meal_manager/main.py

@@ -378,7 +378,9 @@ async def add_team_registration(request: Request, event_id: int, session: Sessio
     work_type = form_data["workType"]
 
     statement = select(TeamRegistration).where(
-        TeamRegistration.person_name == person, TeamRegistration.work_type == work_type
+        TeamRegistration.person_name == person,
+        TeamRegistration.work_type == work_type,
+        TeamRegistration.event_id == event_id,
     )
     # if the person has already registered for the same work type, just ignore
     if session.scalars(statement).one_or_none() is None: