Adding a field on Alyx to query for subject training status about ibllib HOT 3 CLOSED

def query_criterion(subject, status, from_status=None, one=None):
    """
​
    Parameters
    ----------
    subject : str
        The subject name.
    status : str
        The training status to query for.
    from_status : str, optional
        Count number of sessions and days from reaching `from_status` to `status`.
    one : one.api.OneAlyx, optional
        An instance of ONE.
​
    Returns
    -------
    str
        The eID of the first session where this training status was reached.
    int
        The number of sessions it took to reach `status` (optionally from reaching `from_status`).
    int
        The number of days it tool to reach `status` (optionally from reaching `from_status`).
    """
    one = one or ONE()
    subject_json = one.alyx.rest('subjects', 'read', id=subject)['json']
    if not (criteria := subject_json.get('criteria')) or status not in criteria:
        return None, None, None
    to_date = criteria[status]
    from_date = criteria.get(from_status)
    eids, det = one.search(subject=subject, date_range=[from_date, to_date], details=True)
    date_range = list(map(datetime.date.fromisoformat, (det[0], det[-1])))
    return eids[-1], len(eids), (date_range[1] - date_range[0]).days