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// AI Suggestion: Potential race condition detected
async function processPayment(payment: PaymentRequest) {
  const user = await getUser(payment.userId);
  
  // ⚠️ AI: Race condition - balance check and update not atomic
  if (user.balance < payment.amount) {
    throw new Error('Insufficient funds');
  }
  
  // ✅ AI Suggestion: Use database transaction with row locking
  await db.transaction(async (tx) => {
    const lockedUser = await tx.users.findUnique({
      where: { id: payment.userId },
      lock: 'FOR UPDATE'  // Prevents race condition
    });
    
    if (lockedUser.balance < payment.amount) {
      throw new Error('Insufficient funds');
    }
    
    await tx.users.update({
      where: { id: payment.userId },
      data: { balance: { decrement: payment.amount } }
    });
  });
}