Model Versioning & Registry

Model Versioning & Registry#

At a mid-sized tech company in 2022, a recommendation model got quietly overwritten in production by a training job that had no guardrails. Click-through rate dropped 18% over three days. The on-call engineer couldn't roll back because nobody knew what the previous model was, where it lived, or when it had been replaced. They ended up retraining from scratch using a two-week-old checkpoint and hoping for the best.