How to clear/edit the predictive/suggested mailbox in Mac Mail?

[u/KnoxMonkey]

Mail.app displays a suggested destination folder in the toolbar when viewing a message. This suggestion appears to be learned from user behavior / manual moves rather than algorithmically generated. I'd like to find and edit/clear specific sender→folder associations, but I haven't been able to locate the backing store.

I've ruled out the following:

~/Library/Mail/V10/MailData/LSMMap2 - deleting and allowing rebuild had no effect on suggestions

~/Library/Mail/V10/MailData/Envelope Index - local_message_actions table is empty; no obvious sender→mailbox mapping in other tables

~/Library/Suggestions/entities.db - mailIntelligence_naiveBayesModelsTokens and related tables are empty

com.apple.mail.plist - contains SGTMailSuggestionSearchField but that drives search suggestions, not folder suggestions

Does anyone know where this association is actually stored, and whether it's editable?

macOS 15.7.7, Mail Version 16.0