Add scheduled worker to purge old user IPs (#4951)

* Add scheduled worker to purge old user IPs

* Use ruby 1.9 hash syntax

app/workers/scheduler/ip_cleanup_scheduler.rb

+# frozen_string_literal: true
+require 'sidekiq-scheduler'
+
+class Scheduler::IpCleanupScheduler
+  include Sidekiq::Worker
+
+  def perform
+    time_ago = 5.years.ago
+    SessionActivation.where('updated_at < ?', time_ago).destroy_all
+    User.where('last_sign_in_at < ?', time_ago).update_all(last_sign_in_ip: nil)
+  end
+end

config/sidekiq.yml

@@ -24,3 +24,6 @@
   subscriptions_cleanup_scheduler:
     cron: '2 2 * * 0'
     class: Scheduler::SubscriptionsCleanupScheduler
+  ip_cleanup_scheduler:
+    cron: '0 4 * * *'
+    class: Scheduler::IpCleanupScheduler