The dlt+ Cache is a portable compute layer for developing, testing, and validating data transformations before they hit production. It provides a staging layer that allows engineers to test, validate, and debug transformations without running everything in the warehouse. The cache offers an engine-agnostic interface, supports various SQL dialects, and integrates with existing data workflows. It enables users to run transformations locally, validate schema changes, and test without burning cloud costs. The dlt+ Cache is designed to solve the problem of debugging transformations in production, which can be time-consuming and costly. By using the cache, engineers can build pipelines more efficiently and reduce the need for dev environments.