In our previous article, we peeled back the curtain on how we built VTrade’s high-fidelity market execution engine to simulate real-world slippage and order-book friction. But calculating a precise execution price is only half the battle. Once those orders clear, you hit the ultimate state-tracking nightmare: Portfolio Intelligence . On VecTrade.io , users expect to see their Total Portfolio Value (NAV) , Daily P&L , Sector Allocations , and 7-day Equity Curves update instantly whenever a live a