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export async function GET() {
  try {
    const fileContent = await fs.readFile(METRICS_FILE, 'utf-8');
    const metrics = JSON.parse(fileContent);
    
    // Use the non-empty fill_predictions
    if (Object.keys(metrics.time_metrics.fill_predictions || {}).length > 0) {
      metrics.fill_predictions = metrics.time_metrics.fill_predictions;
    }
    // Otherwise keep the root level fill_predictions if it's not empty
    else if (Object.keys(metrics.fill_predictions || {}).length === 0) {
      metrics.fill_predictions = {};
    }
    
    return NextResponse.json(metrics);
  } catch (error) {
    console.error('Error reading metrics file:', error);
    return NextResponse.json(
      { error: 'Failed to read metrics data' },
      { status: 500 }
    );
  }
}