add submission event account id

db/migrate/20251121090556_add_account_id_to_submission_events.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddAccountIdToSubmissionEvents < ActiveRecord::Migration[8.0]
+  def change
+    add_reference :submission_events, :account, null: true, foreign_key: true, index: true
+  end
+end