Operational Health: Schema update detection with dlt

In the blog post, Aman Gupta, a data engineer, explains the process of monitoring and handling schema changes in a data pipeline using the Data Load Tool (dlt) integrated with a DuckDB pipeline. The post outlines a practical approach to detecting schema updates by utilizing the `check_schema` function, which alerts users to new columns added during pipeline execution, ensuring schema changes do not go unnoticed. It describes how dlt automatically manages schema evolution by adding new columns and handling type mismatches by creating variant columns. Furthermore, it highlights the importance of separate schema monitoring, which requires manual instrumentation for effective auditing, using tools like `_dlt_loads` to track pipeline runs and `_dlt_version` to maintain schema version history. This setup provides a comprehensive schema audit trail, allowing users to trace changes and maintain data integrity in their pipelines.