Expiry of __MD5__ entries

Hi,

i've noticed that __MD5__ entries are not processed by the cleanup
command if they are "in use" (i.e., if the corresponding mails have
not been removed, which is indicated by a word count of >= 1).
Therefore, each processed mail leaves such entry in the database
forever.

For people who like to refeed their old ham/spam to SP from time to
time, this may be a good thing. For people who don't, it may be good
to be able to remove such meta-data from the database after a while
(my database currently has about 35000 __MD5__ entries). I know this
is dangerous if those entries have been removed and the removed mails
are nevertheless refed into SP.

Perhaps a special option could be added to the cleanup command that
allows removing these entries by age?


Greetings,
Thomas.


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