Function holder_rows 

fn holder_rows(
    rows: &mut Vec<DeviceRow>,
    holders: &[(String, i64, bool)],
    words: &Translator,
)

Every device holding the newer form back has its line, so that the window says which (docs/database.md, “The format of what travels”): one the rows do not list (known to the sharing alone, by what it shared before, or forgotten here while the sharing heard it since) is added, with “Forget this device”: it is not counted for your doses, so forgetting it makes no dose look known. One listed keeps its own line: forgotten only once silent for a week, as any device, since a device counted for your doses and forgotten could make a dose it took look not taken.