Renumber article slugs to sequential article-N

One-time PocketBase migration that replaces every article's slug with
article-1, article-2, ... ordered by publishedAt (oldest first),
requested explicitly by the site owner in place of the existing
descriptive slugs.

pocketbase/pb_migrations/1757500003_renumber_article_slugs.js

@@ -0,0 +1,35 @@
+/// <reference path="../pb_data/types.d.ts" />
+
+// One-time cleanup: replace every article's slug with a sequential
+// "article-N", ordered by publishedAt (oldest first; drafts, which have no
+// publishedAt, sort after published articles by creation order). Requested
+// explicitly by the site owner, aware this drops the existing descriptive
+// slugs and breaks any already-indexed/shared URLs using them.
+//
+// Two passes with a temporary unique slug in between: assigning final slugs
+// in a single pass can collide with another record's current slug that
+// hasn't been renamed yet (slug has a unique index).
+migrate((app) => {
+  const articles = app.findAllRecords('articles')
+
+  articles.sort((a, b) => {
+    const publishedA = a.getString('publishedAt')
+    const publishedB = b.getString('publishedAt')
+    if (publishedA && publishedB) return publishedA < publishedB ? -1 : publishedA > publishedB ? 1 : 0
+    if (publishedA) return -1
+    if (publishedB) return 1
+    return a.getString('created') < b.getString('created') ? -1 : 1
+  })
+
+  articles.forEach((record) => {
+    record.set('slug', `migrating-${record.id}`)
+    app.save(record)
+  })
+
+  articles.forEach((record, index) => {
+    record.set('slug', `article-${index + 1}`)
+    app.save(record)
+  })
+}, (_app) => {
+  // Not reversible: the original slugs aren't recorded anywhere.
+})