add stats

db/migrate/20260819091500_add_submissions_account_template_statistics.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class AddSubmissionsAccountTemplateStatistics < ActiveRecord::Migration[8.1]
+  def up
+    return unless adapter_name == 'PostgreSQL'
+
+    execute <<~SQL.squish
+      CREATE STATISTICS IF NOT EXISTS submissions_account_template_stats (dependencies, ndistinct)
+      ON account_id, template_id FROM submissions
+    SQL
+  end
+
+  def down
+    return unless adapter_name == 'PostgreSQL'
+
+    execute 'DROP STATISTICS IF EXISTS submissions_account_template_stats'
+  end
+end