Clean up unused application records (#24871)

app/lib/vacuum/applications_vacuum.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class Vacuum::ApplicationsVacuum
+  def perform
+    Doorkeeper::Application.where(owner_id: nil)
+                           .where.missing(:created_users, :access_tokens, :access_grants)
+                           .where(created_at: ...1.day.ago)
+                           .in_batches.delete_all
+  end
+end