fix(orders): release PO number against creation year; tighten sort-dir + enum typing

Addresses review of the issued-orders service: deleteIssuedOrder now derives the release year from created_at (cross-year deletes reclaim the right sequence); list sort direction is normalized to asc/desc; status cast uses $Enums instead of as-never. Adds a cross-year delete test.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/__tests__/issued-orders.test.ts

@@ -195,4 +195,25 @@ describe("deleteIssuedOrder", () => {
     ).toBe(0);
     expect((await previewIssuedOrderNumber()).number).toBe(before);
   });
+
+  it("releases the number against the order's creation year, not the current year", async () => {
+    const priorYear = new Date().getFullYear() - 1;
+    // Allocate a real prior-year number (consumes that year's sequence: 0 -> 1)
+    // so the PO number matches the prior year's current highest.
+    const { number: poNumber } = await generateIssuedOrderNumber(priorYear);
+    const order = await createIssuedOrder({ po_number: poNumber });
+    createdIds.push(order.id);
+    // Backdate creation into the prior year so delete derives that year.
+    await prisma.issued_orders.update({
+      where: { id: order.id },
+      data: { created_at: new Date(priorYear, 5, 1, 12, 0, 0) },
+    });
+    await deleteIssuedOrder(order.id);
+    // The prior-year sequence must be decremented (1 -> 0). With the old
+    // current-year bug it would stay at 1 (no current-year row to match).
+    const seq = await prisma.number_sequences.findFirst({
+      where: { type: "issued_order", year: priorYear },
+    });
+    expect(seq?.last_number).toBe(0);
+  });
 });

src/services/issued-orders.service.ts

@@ -1,3 +1,4 @@
+import type { $Enums } from "@prisma/client";
 import prisma from "../config/database";
 import {
   generateIssuedOrderNumber,
@@ -106,10 +107,12 @@ export async function listIssuedOrders(params: ListIssuedOrdersParams) {
     ];
   }
 
+  // Normalize the direction so an unexpected value can't reach Prisma at runtime.
+  const dir: "asc" | "desc" = order === "asc" ? "asc" : "desc";
   // Tiebreak on id so same-day order_date rows sort deterministically.
-  const orderBy: Record<string, string>[] = [
+  const orderBy: Record<string, "asc" | "desc">[] = [
-    { [sortField]: order },
+    { [sortField]: dir },
-    { id: order },
+    { id: dir },
   ];
 
   const [rows, total] = await Promise.all([
@@ -176,7 +179,9 @@ export async function createIssuedOrder(body: IssuedOrderInput) {
       data: {
         po_number: poNumber,
         customer_id: body.customer_id ? Number(body.customer_id) : null,
-        status: (body.status ? String(body.status) : "draft") as never,
+        status: (body.status
+          ? String(body.status)
+          : "draft") as $Enums.issued_orders_status,
         currency: body.currency ? String(body.currency) : "CZK",
         vat_rate: body.vat_rate != null ? Number(body.vat_rate) : 21.0,
         apply_vat: body.apply_vat !== false,
@@ -306,10 +311,13 @@ export async function deleteIssuedOrder(id: number) {
   const existing = await prisma.issued_orders.findUnique({ where: { id } });
   if (!existing) return null;
   await prisma.issued_orders.delete({ where: { id } });
-  await releaseIssuedOrderNumber(
+  // Reclaim the number against the year it was allocated in (the creation year),
-    new Date().getFullYear(),
+  // not the current year — a cross-year delete must release the right sequence
-    existing.po_number ?? undefined,
+  // or the number is never freed.
-  );
+  const year = existing.created_at
+    ? new Date(existing.created_at).getFullYear()
+    : new Date().getFullYear();
+  await releaseIssuedOrderNumber(year, existing.po_number ?? undefined);
   return existing;
 }