Ensure Sidekiq jobs are unique (if the queue contains several jobs with same class and args, this will delete all but one of them)

uniq.rb

def self.uniq! queue_name
 seen_already = Set.new
 Sidekiq::Queue.new(queue_name).each { |job|
   key = { job.klass => job.args }
   key.in?(seen_already) ? job.delete : seen_already << key
 }
end