- # Foreach period, seek back from now to the period's starting time, and
- # collect the most recent saves
+ # Break the decreasing utc sorted saves up into the respective
+ # period ranges (dailies, monthlies, ...). Within each range,
+ # group the saves by the period scale (days, months, ...), and
+ # then yield a "keep" action (True, utc) for the newest save in
+ # each group, and a "drop" action (False, utc) for the rest.