I built nftguard: atomic nftables versioning with instant rollback

I manage multiple Linux servers. Each one has its own nftables firewall config — some with 50 rules, some with 200+. And for years, my "versioning system" was a mix of .bak files, commented-out lines, and the vague hope that I'd remember what changed last Tuesday. Then one night I fat-fingered a flush command and locked myself out of a production box via SSH. Recovery took 40 minutes. The fix took 10 seconds — I just needed the previous ruleset. But I didn't have it. So I built nftguard . What m