Implement expense tracking foundation for v1

src/app/expenses/[id]/route.ts

@@ -0,0 +1,26 @@
+import { Prisma } from "@prisma/client";
+import { NextResponse } from "next/server";
+
+import { removeExpense } from "@/lib/expenses";
+
+type RouteContext = {
+  params: Promise<{ id: string }>;
+};
+
+export async function DELETE(_: Request, context: RouteContext) {
+  const { id } = await context.params;
+
+  try {
+    await removeExpense(id);
+    return new NextResponse(null, { status: 204 });
+  } catch (error) {
+    if (
+      error instanceof Prisma.PrismaClientKnownRequestError &&
+      error.code === "P2025"
+    ) {
+      return NextResponse.json({ error: "Expense not found." }, { status: 404 });
+    }
+
+    throw error;
+  }
+}

src/app/expenses/route.ts

@@ -0,0 +1,30 @@
+import { NextResponse } from "next/server";
+
+import { createExpense, listExpenses } from "@/lib/expenses";
+import { expenseInputSchema } from "@/lib/validation";
+
+export async function GET() {
+  const expenses = await listExpenses();
+  return NextResponse.json({ expenses });
+}
+
+export async function POST(request: Request) {
+  const payload = await request.json();
+  const parsed = expenseInputSchema.safeParse(payload);
+
+  if (!parsed.success) {
+    return NextResponse.json(
+      { error: parsed.error.issues[0]?.message ?? "Invalid expense payload." },
+      { status: 400 },
+    );
+  }
+
+  const expense = await createExpense({
+    title: parsed.data.title,
+    amountCents: parsed.data.amount,
+    date: parsed.data.date,
+    category: parsed.data.category,
+  });
+
+  return NextResponse.json({ expense }, { status: 201 });
+}