Financial Math & Currency Handling Skill

This skill governs how monetary values are handled in the Midas Web Concept project.

🚨 ZERO TOLERANCE RULES

1. •NO FLOATING POINTS: Never use standard JavaScript number type for financial calculations.
2. •LIBRARY USAGE: Always use decimal.js (client-side) or Prisma.Decimal (server-side/DB).
3. •CURRENCY ISOLATION: Never add/subtract values of different currencies (e.g., USD + TRY).

🛠 Implementation Guidelines

1. Database & Type Definition

• •In schema.prisma, all monetary fields must be Decimal(19, 4).
• •In TypeScript interfaces, map these fields to Decimal or string (never number).

2. Calculation Pattern

When calculating Portfolio Value or Trade Totals:

import Decimal from 'decimal.js';

// BAD ❌
const total = price * quantity; 

// GOOD ✅
const priceDec = new Decimal(price);
const qtyDec = new Decimal(quantity);
const total = priceDec.times(qtyDec);