Add Fetch All Replies Part 1: Backend (#32615)

Signed-off-by: sneakers-the-rat <sneakers-the-rat@protonmail.com>
Co-authored-by: jonny <j@nny.fyi>
Co-authored-by: Claire <claire.github-309c@sitedethib.com>
Co-authored-by: Kouhai <66407198+kouhaidev@users.noreply.github.com>

db/migrate/20240918233930_add_fetched_replies_at_to_status.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddFetchedRepliesAtToStatus < ActiveRecord::Migration[7.1]
+  def change
+    add_column :statuses, :fetched_replies_at, :datetime, null: true
+  end
+end