Update sidekiq settings

config/initializers/sidekiq.rb

@@ -0,0 +1,9 @@
+require 'sidekiq'
+
+Sidekiq.configure_server do |config|
+  config.redis = { url: Danbooru.config.redis_url }
+end
+
+Sidekiq.configure_client do |config|
+  config.redis = { url: Danbooru.config.redis_url }
+end

config/sidekiq.yml

@@ -16,6 +16,6 @@
 
 # you can override concurrency based on environment
 production:
-  :concurrency: 25
+  :concurrency: 15
 staging:
-  :concurrency: 5
+  :concurrency: 5