$category_id = RandomUuid(1);
$id1 = RandomUuid(2);
$id2 = RandomUuid(3);

INSERT INTO
    my_table(category_id, id)
VALUES
    ($category_id, $id1),
    ($category_id, $id2);

SELECT $category_id AS category_id, $id1 AS id1, $id2 AS id2;