async function pollBatchStatus(batchId) {
  const response = await fetch(`/api/pdf-bulk-upload/${batchId}/status`);
  const data = await response.json();
  
  updateProgressUI(data);
  
  if (data.status !== 'COMPLETED' && data.status !== 'FAILED') {
    setTimeout(() => pollBatchStatus(batchId), 3000);
  }
}

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