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def process_payment(user_id, amount):
    # Read current balance
    balance = db.query(
        "SELECT balance FROM accounts 
         WHERE id = %s", [user_id]
    )
    
    if balance >= amount:
        # ⚠️  RACE CONDITION HERE
        # Another thread can run between
        # the check and deduction
        time.sleep(0.001)  # simulates latency
        
        db.execute(
            "UPDATE accounts SET balance = 
             balance - %s WHERE id = %s",
            [amount, user_id]
        )
        return {"status": "success"}
    
    return {"status": "insufficient_funds"}

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