@ocean maybe @notesnook is something for you.
It's even E2E encrypted in case somebody got access to your server or so.

https://github.com/streetwriters/notesnook-sync-server?tab=readme-ov-file#notesnook-sync-server

@irotsoma @Jakeroxs well, I think there's @fastmail's JMAP #protocol ( https://jmap.io/ ) which does that.
So you could just use a client that supports #JMAP (i.e @daniel's Lttrs: https://ltt.rs/ ) and a server which supports this as well (i.e. @stalwartlabs )

@Tiritibambix /CC @notesnook