Manually learnt HAM as SPAM. Can I undo?

[Nicolas]

Hello,

This morning I made a mistake with spamassassin. I manually learnt
(/usr/bin/sa-learn --spam) an IMPORTANT message as SPAM. I immediately
learnt it as HAM, but is that sufficient?
Do I have to delete all of the bayes tokens I accumulated for over 1
year?

Thanks.
Nicolas.