Adds mechanism to avoid too many retries

lib/outboxable/polling_publisher_worker.rb

@@ -4,11 +4,13 @@ module Outboxable
     sidekiq_options queue: 'critical'
 
     def perform
-      Outbox.pending.find_in_batches(batch_size: 100).each do |batch|
+      Outbox.pending.where(last_attempted_at: [..Time.zone.now, nil]).find_in_batches(batch_size: 100).each do |batch|
         batch.each do |outbox|
+          # This is to prevent a job from being retried too many times. Worst-case scenario is 1 minute delay in jobs. 
+          outbox.update(last_attempted_at: 1.minute.from_now)
           Outboxable::Worker.perform_async(outbox.id)
         end
       end
     end
   end
-end
+end