Erase old tokens ?

Hello ?
I would like to know something..

when i use bogotil -d wordlist.db, i got :

XXXX 3 4 20063101


I guess XXXX is the token, 20063101 is the last day i saw this token, but
what does 3 and 4 mean ?

The number of times this token has been viewed ? and 4 is the score ? i
cannot find any help :(

The aim of this question is to "clean" the wordlist.db, since the size is
about 500meg..:(

i would like to erase token which are unused.

any idea to do that kinda script ?

thx
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