feat: close workstation login on RDG 303 disconnect (0.4.6)

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/api/v1/events.py

@@ -256,7 +256,7 @@ def post_event_terminate_session(
         raise HTTPException(status_code=404, detail="Event not found")
     if not event_supports_session_terminate(event):
         raise HTTPException(status_code=400, detail="Event type does not support session terminate")
-    if event_session_terminated(event):
+    if event_session_terminated(event, db=db):
         raise HTTPException(status_code=409, detail="Session already terminated for this event")
 
     linux_cfg = get_effective_linux_admin_config(db)