M18: implement operational workspaces

backend/app/services/returns.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import uuid
 from dataclasses import dataclass
-from datetime import UTC, datetime
+from datetime import UTC, datetime, timedelta
 
 from sqlalchemy import select
 from sqlalchemy.exc import IntegrityError
@@ -255,6 +255,7 @@ def register_vehicle_return(
             },
             proposed_action_json={},
             detected_at=now,
+            due_at=now + timedelta(days=1),
         )
         db.add(issue)
         db.flush()