[knot-dns-users] Regarding multi-signer operations

Hi I have two questions about this blog post on multi-signers: https://en.blog.nic.cz/2025/05/07/knot-dns-in-a-complex-dnssec-topology/ First, the blog post shows auto-increment SOA serial mode for the zone files in-line with the docs example: ``` zonefile-sync: -1zonefile-load: difference-no-serial journal-content: all ``` This would work fine for me in general, I don't mind zone files being the "source of truth". But the docs has a note "This mode is not suitable if the zone can be modified externally (e.g. DDNS, knotc)." Do I understand correctly that this is because any dynamic changes to the zone get wiped on reboot ?  So, for example, if the only external DDNS modification in my environment is DNS-01 for cert issuance, it won't cause me a problem, because those are ephemeral by nature anyway ? This then raises the second question, how would I deal with catlog zones with this concept of multi-signers ? Or are catlog zones too much trouble in a multi-signer environment ? Thank you