Question
If the duration is 20 minutes,
1) is the duration per item?
2) or is the duration for the table as a whole?
Suppose the following items
("a", "a-value") 30 minutes ago
("b", "b-value") 10 minutes ago
Does "a" get cleaned up? or neither gets cleaned up yet because the most
recent item is not above the duration?
Another question
Also, if enough time passes, does the cleanup happen during a checkpoint,
savepoint, or the next time the PersistentTable is accessed? If the table
is never accessed again, will it remain in the savepoints forever?
