Fix performances of profile directory (#26842)

db/migrate/20230907150100_add_index_account_stats_on_last_status_at_and_account_id.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class AddIndexAccountStatsOnLastStatusAtAndAccountId < ActiveRecord::Migration[7.0]
+  disable_ddl_transaction!
+
+  def change
+    add_index :account_stats, [:last_status_at, :account_id], order: { last_status_at: 'DESC NULLS LAST' }, algorithm: :concurrently
+  end
+end