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;
+  }
+}