FIX: run deferred jobs inline in sidekiq

config/initializers/100-sidekiq.rb

@@ -13,6 +13,9 @@ Sidekiq.configure_server do |config|
 end
 
 if Sidekiq.server?
+  # defer queue should simply run in sidekiq
+  Scheduler::Defer.async = false
+
   # warm up AR
   RailsMultisite::ConnectionManagement.each_connection do
     (ActiveRecord::Base.connection.tables - %w[schema_migrations]).each do |table|

lib/scheduler/defer.rb

@@ -21,7 +21,7 @@ module Scheduler
       @paused = false
     end
 
-    # for test
+    # for test and sidekiq
     def async=(val)
       @async = val
     end