def create_minimal_v2_map(json_data):
    """
    Create a minimal map for lookup where each key is a v2 user id (PK).

    Since the map created from the
    """
    v2_user_data_map = {}
    for data in json_data:
        v2_user_data_map[data['pk']] = {
            'username': data['fields']['username'],
            'last_login': data['fields']['last_login']
        }
    return v2_user_data_map