Your question is Refactoring Pipelines for Reliability. Take a moment with it on the right.
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Refactor an existing data pipeline script for improved performance, concurrency, and error handling.
Review the supplied script and identify its main bottlenecks, unsafe failure modes, and opportunities for parallel execution. Produce a practical refactor that preserves the existing data contract, limits concurrency to avoid overwhelming dependencies, handles transient and permanent errors differently, and supports safe retries or reruns. Include structured logging, configuration-driven behavior, validation of inputs and outputs, and tests for successful processing, partial failure, retry exhaustion, and cancellation. Explain the trade-offs behind your implementation and how you would measure whether it improved the pipeline.
