Fix Data Accuracy Performance Issues

I need you to focus exclusively on the data-processing module of my already-running application and eliminate the performance-related data accuracy problems that have recently appeared. At the moment certain transactions return inconsistent values and reports show occasional mis-calculations, suggesting that processing logic slows down under load and then writes or displays incorrect results.

Your task is to profile the relevant services, trace the accuracy failures back to their source, and refactor whatever is necessary so that processing is fast and every record is stored and served exactly once and in the right form. I will share the full repository, CI pipeline, recent logs, and a representative data set as soon as we open the branch for this work.

Deliverables
• Corrected source code for the data-processing component
• Unit and integration tests proving data integrity under realistic load
• A short technical report summarising root cause, fix, and measurable performance/accuracy gains
• Updated documentation or configuration files affected by the changes

Please keep to our existing code style, push through feature branches, and be sure the CI suite stays green before you mark the milestone complete.