def query_as_of(start_node_id: str, relation: str, as_of_date: str):
    return graph.find_edges(
        source=start_node_id,
        relation=relation,
        filters={
            "valid_from": {"lte": as_of_date},
            "valid_to": {"gte": as_of_date, "or_null": True}
        }
    )