EteSync Server VS DecSync

Are you / have you considered leveraging postgres' row level security for this (row filtering)? Feels like a natural fit for ensuring the right subset of data gets to the right users https://www.postgresql.org/docs/current/ddl-rowsecurity.html

E2E encryption would also be nice to have, it could be worth having a look at https://www.etesync.com/ for inspiration

A few days ago I saw some guys in this community saying that they uses https://www.etesync.com/ in order to sync contacts between Proton + Thunderbird (Desktop) + Mobile. I haven't used it yet, but I saved the link.

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EteSync - Secure Data Sync (version 2.4.0): Secure, private and end-to-end encrypted calendar, contacts and tasks sync

The programs will allow me to sync both my Google and my Etesyc Contacts and Calendars. Etesync also needs Etesync-Dav installed on the desktop but that is well explained on Github.

There is https://www.etesync.com

A few years back I used to use SyncThing + DecSync for that purpose, and it worked quite well. Looks like it hasn't been updated in a while though.

https://github.com/39aldo39/DecSync

DecSync

There is decsync that works pretty good on Android. It stores contacts & calendars in a text file that can be synced with syncthing. There is a plugin for Evolution (Linux Mail client) but none for Thunderbird. But there is a plugin for Radicale, which is a caldav server. So you can run a local caldav server, connect Thunderbird to it and sync the decsync database with syncthing to your phone.

DecSync works with Syncthing to sync contacts and calendars.

I am a bit puzzled why so few people use DecSync and Syncthing for this?

I found some discussion here which is confusing when it says it wasn't designed to function this way when their own documentation seems to indicate otherwise.

I'm fine with either paying for software, or self-hosting something. If I go the self-host route, however, I would need to start and learn completely from square one. I saw some options in my searches that required software on my own server, but I wouldn't even know where to begin with that. DecSync came up in my searches, but based on the description I'm not sure if it would be linux only or not. (I'm on windows)