todo.readyfiles = append(todo.readyfiles, fname)
		}
	}
	return todo.readyfiles, nil
}

// latestReport returns the YYYY-MM-DD of the last report uploaded
// or the empty string if there are no reports.
func latestReport(uploaded map[string]bool) string {
	var latest string
	for name := range uploaded {
		if strings.HasSuffix(name, ".json") {
			if name > latest {