refactor: Simplify unsubscribe functionality in articlePush and categoryPush by enforcing required identifiers in request body

src/utils/articlePush.js

@@ -97,14 +97,7 @@ export async function articlePushSubscribe(kArtikel, subscription) {
   return { ...data, httpOk: res.ok };
 }
 
-/**
- * POST /api/article/push/unsubscribe — body: `{ endpoint }` or `{ subscription: { endpoint } }` (pickup-style).
- * Optional `kArtikel` (number or numeric string): if it parses to a finite id > 0, only that row is removed.
- * Otherwise legacy: server clears all push rows for that endpoint (article + category + pickup).
- *
- * @param {string} endpoint
- * @param {number|string} [kArtikel]
- */
+/** POST /api/article/push/unsubscribe — body is always `{ endpoint, kArtikel }` (scoped row only). */
 export async function articlePushUnsubscribe(endpoint, kArtikel) {
   const parsed =
     kArtikel != null && kArtikel !== ""
@@ -112,10 +105,10 @@ export async function articlePushUnsubscribe(endpoint, kArtikel) {
         ? kArtikel
         : parseInt(String(kArtikel), 10)
       : NaN;
-  const body =
-    Number.isFinite(parsed) && parsed > 0
-      ? { endpoint, kArtikel: parsed }
-      : { endpoint };
+  if (!Number.isFinite(parsed) || parsed <= 0) {
+    return { success: false, httpOk: false, error: "missing_kArtikel" };
+  }
+  const body = { endpoint, kArtikel: parsed };
   const res = await fetch("/api/article/push/unsubscribe", {
     method: "POST",
     headers: { "Content-Type": "application/json" },

src/utils/categoryPush.js

@@ -45,12 +45,7 @@ export async function categoryPushSubscribe(kKategorie, subscription) {
   return { ...data, httpOk: res.ok };
 }
 
-/**
- * POST /api/category/push/unsubscribe — same contract as article: optional `kKategorie` for scoped delete.
- *
- * @param {string} endpoint
- * @param {number|string} [kKategorie]
- */
+/** POST /api/category/push/unsubscribe — body is always `{ endpoint, kKategorie }` (scoped row only). */
 export async function categoryPushUnsubscribe(endpoint, kKategorie) {
   const parsed =
     kKategorie != null && kKategorie !== ""
@@ -58,10 +53,10 @@ export async function categoryPushUnsubscribe(endpoint, kKategorie) {
         ? kKategorie
         : parseInt(String(kKategorie), 10)
       : NaN;
-  const body =
-    Number.isFinite(parsed) && parsed > 0
-      ? { endpoint, kKategorie: parsed }
-      : { endpoint };
+  if (!Number.isFinite(parsed) || parsed <= 0) {
+    return { success: false, httpOk: false, error: "missing_kKategorie" };
+  }
+  const body = { endpoint, kKategorie: parsed };
   const res = await fetch("/api/category/push/unsubscribe", {
     method: "POST",
     headers: { "Content-Type": "application/json" },