<ul><li>During the first use of a batch UI for uploading Excel files in production, a critical error occurred.</li><li>The Excel file used during testing did not reflect a real-world scenario, resulting in incorrect data assignment.</li><li>The payment data for thousands of employees was mistakenly assigned to the first employee in the file.</li><li>As a result, the first employee listed in the Excel file received overtime payments for the entire company.</li></ul>

You won’t believe this happened in production!

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