I think what you are asking for are server side email filters.
The most common implementation is Sieve, which is supported by Dovecot, Cyrus, and Stalwart IMAP servers (and probably others I'm not aware of). There are a variety of clients that support it, including Thunderbird and Roundcube.
I'm not aware of any email client or server that supports webhooks?
But, I'm pretty sure you can do this with N8N.
r/lostredditors
The only thing I can think of is folder structure. Is your music organised in the "Jellyfin Way"?
That's exactly what CalDAV servers allow. The easiest to set up is probably Baikal, but Radicale/NextCloud are also good options.
The built-in iOS/macOS Reminders.app supports CalDAV for calendars and tasks. Everything is available offline, you can add/edit/delete events and tasks, and it will sync back to the server when you are online again.
This is what Vikunja should allow, but sadly their CalDAV implementation is broken.
I use AGH on both of my servers at home and sync them with adguardhome-sync.
They are the DHCP assigned DNS servers for everyone who lives with us and all the services I run.
Use SQLite. Easy to backup, no process taking up cpu/memory, no users to manage.
How do you get good judgement?
Experience.
How do you get experience?
Bad judgement.
:-)
It's mostly just preference. If you are already familiar with MySQL or Postgres, use what you know. If you just want simple and lightweight, use it with SQLite (no external database).
I see. I really want to use Vikjuna. If you're mostly going to use native clients, you could swap out for a CalDAV server (NextCloud, Radicale or Baikal)?
This is how NFS works. Making sure that usernames and userids match on all of your servers will fix this and is by far the simplest solution. If it didn't work, you probably just made a typo somewhere.
Other options.
Use an LDAP serer (I like LLDAP) to provide a single user database for all your servers. This has lots of advantages (can provision users and change passwords for all servers in a single place). But it is fixing your problem in the same way as above (making usernames and user ids match on all of your servers).
Use Samba/CIFS instead of NFS. Because you authenticate with a user/pass all actions happen as the user you authenticate and so local user permissions don't matter.