feat: initial commit

apps/api/src/modules/pricing/pricing.service.ts

@@ -0,0 +1,23 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { Prisma } from '@prisma/client';
+import { PrismaService } from '../../prisma/prisma.service';
+
+@Injectable()
+export class PricingService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  async recordQuote(karatPerMille: number, pricePerGramRial: Prisma.Decimal.Value, source: string) {
+    return this.prisma.goldPriceQuote.create({
+      data: { karatPerMille, pricePerGramRial, source },
+    });
+  }
+
+  async getLatestQuote(karatPerMille: number) {
+    const quote = await this.prisma.goldPriceQuote.findFirst({
+      where: { karatPerMille },
+      orderBy: { quotedAt: 'desc' },
+    });
+    if (!quote) throw new NotFoundException(`No gold price quote recorded for ${karatPerMille}‰`);
+    return quote;
+  }
+}