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For decent privacy oriented tool recommendations, here’s a list.
https://www.privacyguides.org/en/tools/
There was some drama about the webpages so I’ll link both to avoid angry users. Anyway, KeePassXC is on there, which it seems like it’s a fork of KeePass, you might want to check it out.
No idea how CalDav runs, but if it’s a server, it should be able to run generic scripts, no? Once you are running a generic script, writing one that sends emails though smtp should be possible. Idk.