@sandie
I will try to respond to myself for b) question.
b) I had custom patch applied in 7100 DT (https://forum.netgate.com/topic/183961/nut-package-2-8-1-and-above/58). Reverted it before upgrading, unclicked Auto Apply (it is still uncliked), but this custom patch was re-applied for some reason (?). It had no Auto Apply - I disabled it before uprade. Anyway is it okay to keep this patch? (it was really helpfull with NUT problems)
The patch is now incorporated into 24.03 build (applied to baseline and released as part of build) and System Patches app mistakenly thinks it was (custom) applied and allows to Revert? :) Do I understand I should ignore that and remove somehow this custom patch, because it should never be reverted by anyone?
Please confirm kindly suggested steps.
Also 23.09.1 patch for Terrapin in System Patches is no longer available and is no longer needed? (SSH upgraded?)