Velvet is an AI-first data pipeline tool designed to help software engineers warehouse large language model (LLM) requests and responses by storing them in a PostgreSQL database. With Velvet, users can capture every raw LLM log, store and analyze data to evaluate AI feature performance, optimize costs, and fine-tune models tailored to their system's needs. It offers a queryable data structure for in-depth analysis and provides an automated evaluation loop to consistently improve and trust AI features. Engineers might want to use Velvet to resolve issues, evaluate and optimize models, and prepare data for training their own models, making it a valuable asset for anyone looking to harness the full potential of AI in their software applications.