fix: hide ????????? after session terminate (0.3.8)

Persist session_terminated in event details, expose in API, and update Events/Dashboard UI.

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

backend/app/api/v1/events.py

@@ -22,7 +22,9 @@ from app.services.agent_commands import (
 from app.services.rdg_winrm_actions import execute_logoff_via_winrm, execute_qwinsta_via_winrm
 from app.services.host_sessions import (
     event_session_id,
+    event_session_terminated,
     event_supports_session_terminate,
+    mark_event_session_terminated,
     terminate_session_for_event,
 )
 from app.services.linux_admin_settings import get_effective_linux_admin_config
@@ -254,6 +256,8 @@ 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):
+        raise HTTPException(status_code=409, detail="Session already terminated for this event")
 
     linux_cfg = get_effective_linux_admin_config(db)
     win_cfg = get_effective_win_admin_config(db)
@@ -277,21 +281,17 @@ def post_event_terminate_session(
     except SshHostTargetMissingError as exc:
         raise HTTPException(status_code=400, detail=str(exc)) from exc
 
-    if hasattr(result, "exit_code"):
-        return EventSessionTerminateResponse(
-            ok=result.ok,
-            message=result.message,
-            target=getattr(result, "target", None),
-            stdout=getattr(result, "stdout", None) or None,
-            stderr=getattr(result, "stderr", None) or None,
-        )
-    return EventSessionTerminateResponse(
+    response = EventSessionTerminateResponse(
         ok=result.ok,
         message=result.message,
         target=getattr(result, "target", None),
         stdout=getattr(result, "stdout", None) or None,
         stderr=getattr(result, "stderr", None) or None,
     )
+    if result.ok:
+        mark_event_session_terminated(event, by_username=user.username)
+        db.commit()
+    return response
 
 
 @router.post("/{event_db_id}/actions/qwinsta", response_model=AgentCommandResponse)