Can I change user_id for an existing session?

[comlhj1114]

In my use case, when a guest starts a session, a random UID is generated for both user_id and session_id (I will control the user_id, while the session_id will be generated by the agent engine).

After a few turns, if the user decides to sign up, I want to associate the existing conversation with the new user_id that the user just created.

In this case, is it possible to update the user_id associated with an existing session_id from the temporary UID to the newly created user_id?

Or should I manually copy all events from the existing session to a new session tied to the new user_id?

[sebastian-pear-health-labs]

As far as I understand, you should be able to call the REST API for your deployed agent and fully control the sessions and user ids.
If it helps, you can open the dev tools and see what the ADK web UI sends to the locally running (python fast-api) backend to create the session or continue a session. Note that the user id is hardcoded to 'user' in that local UI.