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Noting this here for my own reference, and any other lemmy server admins that don't happen to be database administrators by day 🙂

I am not a DBA, if I'm doing something bad/incorrect here... please post! Yes, I've reset the password and TOTP token on the example account below.

2FA flags are stored in the local_user table, however that does not show usernames. To find the person_id for the user account you want to disable 2FA for, you'll need to check the person table. I'll use my test account here as an example:

SELECT * from person where name = 'guineapig' and local = 't';

Giving:

Note the number 781227, this is the person_id for this account on my instance. To confirm:
SELECT * from local_user where person_id = '781227';

Yep, the 2FA string has the expected username in it. Now to disable 2FA on the account we need to NULL out both totp_2fa_url and totp_2fa_secret rows:

UPDATE local_user  
SET totp_2fa_url = NULL  
WHERE person_id = 781227;  

UPDATE local_user
SET totp_2fa_secret = NULL
WHERE person_id = 781227;

Should give output like this:

And checking the local_user table again, both TOTP fields should be empty: