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**File:** api/blueprints/v1/approvals.py:88-122 **Problem:** Two users clicking Approve simultaneously can both read status='pending', both update to 'approved', and both send signals. Results in duplicate workflow execution. **Fix:** Use optimistic locking: ```sql UPDATE workflow_approvals SET status = 'approved', approved_by = %s, approved_at = NOW() WHERE approval_key = %s AND status = 'pending' RETURNING * -- If rowcount == 0, approval already processed ``` **Impact:** Duplicate workflow steps, potential data corruption.
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