- Added Upkeeping → Correct catalogue order.

It now recalculates video sort_order from created_at newest-first, so 
videos with corrected/original publish dates appear first in the 
homepage and public catalogue. I also updated 
catalogue/admin/latest-video ordering to use publish date as a 
tie-breaker after stored sort order.

includes/db.php

@@ -56,6 +56,7 @@ function get_db(): PDO {
 
         CREATE INDEX IF NOT EXISTS idx_videos_published  ON videos(published);
         CREATE INDEX IF NOT EXISTS idx_videos_sort       ON videos(sort_order, id);
+        CREATE INDEX IF NOT EXISTS idx_videos_created    ON videos(created_at, id);
         CREATE INDEX IF NOT EXISTS idx_videos_title      ON videos(title);
         CREATE INDEX IF NOT EXISTS idx_sources_video     ON video_sources(video_id);
     ");
@@ -768,6 +769,42 @@ function media_correct_external_view_counts(int $limit = 25): array {
     return media_restore_external_view_counts($limit);
 }
 
+function media_catalogue_order_candidate_count(): int {
+    return (int)get_db()->query("SELECT COUNT(*) FROM videos")->fetchColumn();
+}
+
+function media_correct_catalogue_sort_order(): array {
+    $db = get_db();
+    $videos = $db->query("
+        SELECT id, sort_order
+        FROM videos
+        ORDER BY datetime(created_at) DESC, created_at DESC, id DESC
+    ")->fetchAll();
+
+    $result = [
+        'checked' => count($videos),
+        'updated' => 0,
+    ];
+    if (!$videos) return $result;
+
+    $stmt = $db->prepare("UPDATE videos SET sort_order=?, updated_at=datetime('now') WHERE id=?");
+    $db->beginTransaction();
+    try {
+        foreach ($videos as $index => $video) {
+            $sort_order = $index * 10;
+            if ((int)$video['sort_order'] === $sort_order) continue;
+            $stmt->execute([$sort_order, (int)$video['id']]);
+            $result['updated']++;
+        }
+        $db->commit();
+    } catch (Throwable $e) {
+        $db->rollBack();
+        throw $e;
+    }
+
+    return $result;
+}
+
 function media_youtube_source_url_for_video(int $video_id): string {
     $stmt = get_db()->prepare("
         SELECT source_url
@@ -1436,7 +1473,7 @@ function get_videos_paginated(int $page, int $per_page, bool $published_only = t
         LEFT JOIN video_sources vs ON vs.video_id = v.id
         $where
         GROUP BY v.id
-        ORDER BY v.sort_order ASC, v.id DESC
+        ORDER BY v.sort_order ASC, datetime(v.created_at) DESC, v.created_at DESC, v.id DESC
         LIMIT :limit OFFSET :offset
     ");
     foreach ($bind as $key => $value) $rows->bindValue($key, $value);