Log BackupWorker backtrace, delete Backup if retries exhausted (#6769)

app/workers/backup_worker.rb

@@ -3,7 +3,16 @@
 class BackupWorker
   include Sidekiq::Worker
 
-  sidekiq_options queue: 'pull'
+  sidekiq_options queue: 'pull', backtrace: true, retry: 5, dead: false
+
+  sidekiq_retries_exhausted do |msg|
+    backup_id = msg['args'].first
+
+    ActiveRecord::Base.connection_pool.with_connection do
+      backup = Backup.find(backup_id)
+      backup&.destroy
+    end
+  end
 
   def perform(backup_id)
     backup = Backup.find(backup_id)