diff --git a/db/migrate/20260803140751_add_back_languages_index_to_account_summaries.rb b/db/migrate/20260803140751_add_back_languages_index_to_account_summaries.rb
new file mode 100644
index 00000000000..2a0fcabec8d
--- /dev/null
+++ b/db/migrate/20260803140751_add_back_languages_index_to_account_summaries.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class AddBackLanguagesIndexToAccountSummaries < ActiveRecord::Migration[8.1]
+  disable_ddl_transaction!
+
+  def change
+    add_index :account_summaries, [:account_id, :language, :sensitive], algorithm: :concurrently
+  end
+end