Another relay written in C++: https://github.com/mattn/cagliostr
The last time someone showed up with a C++ relay it went like this: 
nostr:npub1zl3g38a6qypp6py2z07shggg45cu8qex992xpss7d8zrl28mu52s4cjajh
Discussion
cagliostr uses sqlite3 and litestream to ship WAL backups directly to S3.
Can it use litestream to replicate the database to other running instances of cagliostr? nostr:npub1937vv2nf06360qn9y8el6d8sevnndy7tuh5nzre4gj05xc32tnwqauhaj6
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THE cagliostr requires few resource. Currently cagliostr have about 100 users in Japan.
