Extract Transform Load and Pipeline Implementation Logic Questions

Design and implement extract transform load pipelines and the transformation logic that powers analytics and operational features. Topics include source extraction strategies, incremental and full loads, change data capture, transformation patterns, schema migration and management, data validation and quality checks, idempotent processing, error handling and dead letter strategies, testing pipelines and data, and strategies for versioning and deploying transformation code. Emphasize implementation details that ensure correctness and maintainability of pipeline logic.