When person X and person Y enter their details at the same time, both users end up receiving the same registration number due to a duplication issue. The registration number is being generated twice, which should not happen. I suspect this might be caused by a concurrency issue in the logic that generates or assigns the registration numbers. Ideally, each user should receive a unique registration number, even if they register simultaneously. How can I fix this issue and ensure uniqueness in the registration numbers?
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