Function day_note_json 

fn day_note_json(
    key: &str,
    title: &str,
    body: &str,
    offered: &[Offered],
    until: i64,
    words: Value,
) -> Value

What DayNotes.java reads of a notice (day_note): {key, title, body, buttons: [{label, kind, key}], until (Unix ms), words}.