The author of this text, Nick Roach, and his team at Dagster Labs successfully migrated their data ingestion workflow from a managed ETL provider to Embedded ELT using Sling. The migration resulted in significant cost savings ($40,000 per year) and improved control over the ingestion process. The team created a testing environment, built replication configurations for both small and large tables, tested connections with the Sling CLI, and set up Dagster Embedded ELT. They also performed parity testing, swapped downstream tables to source their Sling data, and removed references to their old ETL provider from their Dagster project. The team found that Embedded ELT provided a lightweight toolkit for ingesting and loading data with Dagster, allowing them to define how data is synchronized from source to target data system. The migration was completed within two weeks, demonstrating the speed and efficiency of using Embedded ELT and Sling.