I just noticed there is a calendar app, crazy
nostr:npub1melv683fw6n2mvhl5h6dhqd8mqfv3wmxnz4qph83ua4dk4006ezsrt5c24 has thought about everything we will think in the next five years
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I actually made that in an hour yesterday. It saves it as simple json for now. I was looking into ical / caldav support but got distracted. But hey, it's all open source.