@update
def create_recording(
    audio: blob, name: str, user_id: Principal
) -> CreateRecordingResult:
    user = users.get(user_id)

    if user is None:
        return {"Err": {"UserDoesNotExist": user_id}}

    id = generate_id()
    recording: Recording = {
        "id": id,
        "audio": audio,
        "created_at": ic.time(),
        "name": name,
        "user_id": user_id,
    }

    recordings.insert(recording["id"], recording)

    updated_user: User = {
        **user,
        "recording_ids": [*user["recording_ids"], recording["id"]],
    }

    users.insert(updated_user["id"], updated_user)

    return {"Ok": recording}

    updated_user: User = {
        **user,
        "recording_ids": [*user["recording_ids"], recording["id"]],
    }

    updated_user: User = {
        "id": user["id"],
        "created_at": user["created_at"],
        "username": user["username"],
        "recording_ids": [*user["recording_ids"], recording["id"]],
    }