Question Spamassassin - sitewide or individual mailbox bayes database?

[PSi_101]

I'm hoping someone can clarify wether spamassassin uses a sidewide or per mailbox bayes database.

The following doco refers to a sitewide database - Training SpamAssassin to Work with All Mail Accounts on the Server

But this doco refers to an individual database - https://support.plesk.com/hc/en-us/articles/115003117405-How-to-train-SpamAssassin-on-Plesk-server-

Hoping someone knows. Thanks in advance!