Xandikos VS Joplin

Looks like you looking for CalDAV server, xandikos, baikal, cosmo, cyrus IMAP server supports calendars and contacts, davical, nextcloud/owncloud and bunch others if you would look for CalDAV servers

Git is a really great format for email archives, because it provides free duplication and compression via packfiles, although I think it is a tilting at windmills to try to map specific commits to emails. I explained my git/imap workflow in another comment here.

However, git is perfect for calendars. It is used as a backing store for these caldav servers:

https://github.com/jelmer/xandikos

Self-hosted xandikos in my case, but any CalDAV/CardDAV server works (Nextcloud, ...)

After looking for a long time and trying out different stuff, I ended up with xandikos. I use it together with thunderbird and davx5/davdroid, and have found that it works slightly better than radicale. I run it behind caddy in a podman container, but i think it's also possible to just apt install it.

I've had great success with using Joplin for this, with Syncthing as a sync backend. Works well across OSes; I use it on Linux, macOS, Windows and Android.

https://joplinapp.org/

The tools to manipulate SQL aren't that bad, no.

But rather than having a self explanatory markdown & flat file, now I have to start learning about the schema & making specific tools (in my preferred language) for manipulating Joplin's schema.

Suddenly I'm digging through 20 different technic specs to decode what data is where, how it works, and what I can do to it. Want to edit history? This is the best help you'll get, pray it's adequately technical to expedite you to your purpose: https://github.com/laurent22/joplin/blob/dev/readme/dev/spec...

As I began with, I struggle to imagine anything that generates anywhere near as much user agency as flat files and markdown. Having boring common data & systems lets me apply portable skills I already have, rather than having to skill up in some particular product's own ecosystem.

Joplin is a good open source option too, feels more like the original Evernote in terms of UI/UX https://github.com/laurent22/joplin/

Joplin, an open source, extendable, Markdown-based hierarchical note-taking app: https://joplinapp.org/

It lets you choose a synchronization backend, offers applications for every major desktop and mobile OS (also has a terminal version). You can create notebooks and subnotebooks to organize your notes. You can also add tags for better search experience. I created notebooks for specific domains (work-related, home improvement, etc.) and also keep a "temp" for quick notes and W.I.P. snippets.

Its only con that it uses Electron on desktop which causes relatively slow start of the application.

done