Worked on the braintrustdata/braintrust-proxy repository to implement proactive model lifecycle governance through automated deprecation scheduling. Developed a new deprecation_date field within ModelSpec, enabling teams to plan and enforce model deprecations systematically. Enhanced the sync_models script and extended the API to automatically mark models as deprecated once their scheduled date passes, reducing the risk of stale models in production. This approach improved governance oversight and deployment readiness by ensuring timely lifecycle enforcement. The work relied on TypeScript and JSON for API development, model management, and testing, focusing on robust automation and maintainability within the model deployment pipeline.