Added Delayed::Jobs plugin to reset Settings before each job execution to prevent loading of obsolete Setting values from cache.

config/initializers/delayed_jobs_settings_reset.rb

@@ -0,0 +1,20 @@
+require 'delayed_job'
+
+class ResetSettingsPlugin < Delayed::Plugin
+
+  callbacks do |lifecycle|
+    lifecycle.before(:invoke_job) do |*_args|
+
+      Rails.logger.debug 'Resetting Settings before Job execution'
+
+      # reload all settings before starting a job
+      # otherwise it might be that changed settings
+      # from other processes (e.g. Rails server)
+      # are reflected and obsolete, cached values
+      # are wrongfully used
+      Setting.reload
+    end
+  end
+end
+
+Delayed::Worker.plugins << ResetSettingsPlugin