huginn/config/initializers/delayed_job.rb

Delayed::Worker.destroy_failed_jobs = false
Delayed::Worker.max_attempts = 5
Delayed::Worker.max_run_time = 20.minutes
Delayed::Worker.read_ahead = 5
Delayed::Worker.default_priority = 10
Delayed::Worker.delay_jobs = !Rails.env.test?

# Delayed::Worker.logger = Logger.new(Rails.root.join('log', 'delayed_job.log'))
# Delayed::Worker.logger.level = Logger::DEBUG

class Delayed::Job
  scope :pending, ->{ where("locked_at IS NULL AND attempts = 0") }
  scope :awaiting_retry, ->{ where("failed_at IS NULL AND attempts > 0") }
  scope :failed, -> { where("failed_at IS NOT NULL") }
end