Added protecting hooks

src/modules/hooks/setPublishedAt.ts

@@ -0,0 +1,20 @@
+import type { CollectionBeforeChangeHook } from 'payload'
+
+/**
+ * Sets `publishedAt` to now the first time a document transitions to published,
+ * if it isn't already set. Saves editors from filling the date manually and
+ * keeps blog/article dates accurate for Article JSON-LD and sitemaps.
+ *
+ * Attach to collections with drafts enabled (blog, articles):
+ *   hooks: { beforeChange: [setPublishedAtHook] }
+ *
+ * Only sets on the published transition; never overwrites an existing date
+ * (an editor can still backdate manually).
+ */
+export const setPublishedAtHook: CollectionBeforeChangeHook = ({ data, originalDoc }) => {
+  const becomingPublished = data._status === 'published' && originalDoc?._status !== 'published'
+  if (becomingPublished && !data.publishedAt) {
+    data.publishedAt = new Date().toISOString()
+  }
+  return data
+}