How I Built an Adaptive "Immune System" for Cloud Traffic

Recently, I was tasked with a challenge: Build an automated defense system for a live Nextcloud instance. The goal wasn't just to block "bad guys," but to build a system that actually learns what a normal day looks like and reacts when things get weird. Here is the breakdown of how I engineered this system, the statistical math behind it, and why "Sliding Windows" are a developer's best defense. The Architecture: Under the Hood This isn't just a script running in a vacuum. To make this work in a