by descending post id

rake/fa.rake

@@ -288,4 +288,22 @@ namespace :fa do
       Tasks::Fa::MigrateFaUserPostFavs.new.run_for_posts(start_at:, batch_size:)
     end
   end
+
+  desc "Backfill posted_at for FaPosts from url_str"
+  task backfill_posted_at_from_url_str: :environment do
+    progress = ProgressBar.create(total: nil, format: "%t: %c/%C %B %p%% %a %e")
+    Domain::Post::FaPost
+      .where(posted_at: nil)
+      .includes(:files)
+      .find_in_batches(batch_size: 100) do |batch|
+        ReduxApplicationRecord.transaction do
+          batch.each do |post|
+            if (posted_at = post.posted_at)
+              post.update(posted_at:)
+              progress.increment
+            end
+          end
+        end
+      end
+  end
 end