Controld

Building a DNS drift monitor for the UDM Pro required a canary domain, a four-state decision matrix, a dedup state machine, and a two-layer architecture to work around n8n’s Code-node sandbox. The evaluation order of the matrix is the whole trick.

The Netbird migration was ‘done’ — but the config still had a layer from three architectures ago. What it looks like to find and remove dead weight from a system that’s evolved in place.