Logseq is pretty close

Can't see why not. Personally I'll be paying for them(ente) to host it for me to support development.

Has anyone compared it against seaweedfs?

Also on Odysee (at least an alternative) https://odysee.com/@fireship:6/paying-for-software-is-stupid%E2%80%A6-10-free:5

Not much help right now, but looks like voyager has it on the road map. https://github.com/aeharding/voyager !voyagerapp@lemmy.world

Would like to hear how it workes out for you if you decide to transfer all 800 GB