latestID   string
		lastUpdate time.Time
		withB      []string
		missingB   []string
		deletedCnt int
	)
	for dID, ss := range bs {
		if lastUpdate.IsZero() {
			lastUpdate = mostRecent(ss.meta.CreatedAt, ss.meta.DeletedAt)
			latestID = dID
		}
		recentUpdt := mostRecent(ss.meta.CreatedAt, ss.meta.DeletedAt)
		if recentUpdt.After(lastUpdate) {
			lastUpdate = recentUpdt
			latestID = dID
		}