Disconnect and delete your data

This signs you in at YNAB to prove the account is yours, asks you to confirm, then deletes everything for-ynab holds for it: the YNAB tokens, cached plan data and the request log, and it revokes every connector grant it issued.

Afterwards, also revoke for-ynab in YNAB under Account Settings, Developer Settings, Authorized Applications, since this sign-in creates a YNAB authorization of its own.