Function write_with 

fn write_with(
    path: &Path,
    config: &Config,
    attention: &Attention,
    rows: &[Row],
    sources: &[String],
) -> Result<(), String>

write, with sources’ own rows (sources, by id) written too, each as set or taken out when as usual everywhere; the other sources’ rows stay. The call screening’s rows are never set (screened): left as they are; the first time, written as the older keys seeded them, so that taking those keys out moves neither them nor the screening’s first values.