Couldn't understand if it's a client in the sense other docker containers can use it, or what. Could somebody please clarify?

Can't you have the same mechanism to avoid battery drain on the native app with our own server? I mean server pushing notifications? Why should it drain more battery than using the 'external' server with push?

I agree, but what about power usage?

Trilium user here. Only thing is some issue with the keyboard when used from android.

Same here.

If there is a solution with metadata I'd prefer that, but thank you very much for your contribution.