fix: backfill official news covers after migration

scripts/db-migrate.mjs

@@ -699,6 +699,20 @@ if (
     "ALTER TABLE external_news_sources ADD COLUMN thumbnail_alt TEXT NOT NULL DEFAULT ''",
   );
 }
+if (externalNewsSourceColumns.length) {
+  const missingThumbnail = await (
+    await database.prepare(
+      'SELECT 1 AS present FROM external_news_sources WHERE thumbnail_url IS NULL LIMIT 1',
+    )
+  ).get();
+  if (missingThumbnail) {
+    await (
+      await database.prepare(
+        "UPDATE external_news_provider_state SET next_check_at=NULL WHERE provider='ubisoft'",
+      )
+    ).run();
+  }
+}
 
 const currentModerationScanColumns = await (
   await database.prepare("PRAGMA table_info('content_moderation_scans')")