Add INVESTMENT account type with manual portfolio value recording

src/app/api/accounts/[id]/record-value/route.ts

@@ -0,0 +1,44 @@
+import { NextResponse } from 'next/server'
+import { z } from 'zod'
+import { auth } from '@/lib/auth'
+import { prisma } from '@/lib/prisma'
+
+const schema = z.object({
+  valueCents: z.number().int(),
+  date: z.string().regex(/^\d{4}-\d{2}-\d{2}$/, 'Date must be YYYY-MM-DD'),
+})
+
+export async function POST(
+  req: Request,
+  { params }: { params: Promise<{ id: string }> },
+) {
+  const session = await auth()
+  if (!session?.user?.id) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+
+  const { id } = await params
+  const account = await prisma.account.findFirst({
+    where: { id, userId: session.user.id, type: 'INVESTMENT' },
+  })
+  if (!account) return NextResponse.json({ error: 'Account not found' }, { status: 404 })
+
+  const result = schema.safeParse(await req.json())
+  if (!result.success) return NextResponse.json({ error: result.error.flatten() }, { status: 400 })
+
+  const { valueCents, date } = result.data
+  const d = new Date(date + 'T12:00:00')
+  const year = d.getFullYear()
+  const month = d.getMonth() + 1
+
+  await prisma.account.update({
+    where: { id },
+    data: { currentBalanceCents: valueCents },
+  })
+
+  await prisma.balanceSnapshot.upsert({
+    where: { accountId_year_month: { accountId: id, year, month } },
+    update: { balanceCents: valueCents, computedAt: new Date() },
+    create: { accountId: id, year, month, balanceCents: valueCents },
+  })
+
+  return NextResponse.json({ ok: true })
+}