it might be worth watching this PR for memos, which adds encryption at rest. I can’t vouch for it, as I didn’t read the code but I do use memos and might consider this if it’s merged.

github.com/usememos/memos/pull/5130

This is not E2EE, but I don’t think E2EE is that important if you’re hosting your own data. And clients can use TLS for encryption in transit.