diff --git a/DOCKER-SWARM.md b/DOCKER-SWARM.md
index 5d165c0..fa26201 100644
--- a/DOCKER-SWARM.md
+++ b/DOCKER-SWARM.md
@@ -157,6 +157,8 @@ docker push 127.0.0.1:5000/cw-ovp
 ## Run stack
 ```
 docker stack deploy --compose-file docker-stack.yml CW-OVP
+docker image prune -a -f
+
 docker exec -it 1f7193e6042e bundle exec rails webpacker:install
 docker exec -it 1f7193e6042e bundle exec rake db:migrate 
 ```
diff --git a/app/workers/encode_worker.rb b/app/workers/encode_worker.rb
index df350d0..e180776 100644
--- a/app/workers/encode_worker.rb
+++ b/app/workers/encode_worker.rb
@@ -1,6 +1,6 @@
 class EncodeWorker
   include Sidekiq::Worker
-  sidekiq_options retry: false, backtrace: true
+  sidekiq_options retry: 0, backtrace: true
 
   def perform(encode_id)
     encode = Encode.find(encode_id)
diff --git a/app/workers/thumbnail_worker.rb b/app/workers/thumbnail_worker.rb
index 5872111..a00e179 100644
--- a/app/workers/thumbnail_worker.rb
+++ b/app/workers/thumbnail_worker.rb
@@ -1,6 +1,6 @@
 class ThumbnailWorker
   include Sidekiq::Worker
-  sidekiq_options retry: false, backtrace: true
+  sidekiq_options retry: 0, backtrace: true
 
   def perform(encode_id)
     encode = Encode.find(encode_id)
@@ -18,8 +18,12 @@ def perform(encode_id)
           thumbnail_file_full_path = "#{thumbnail_local_full_path}/#{thumbnail_filename}"
           thumbnail_cmd = Bash::Thumbnail.call(uploaded_file_path, ss, thumbnail_file_full_path)
           thumbnail_url = Storage::Url::Full::Thumbnail.call(encode, base_url, thumbnail_filename)
-          encode.assets.create(format: 'image', url: thumbnail_url)
-          encode.thumbnails.attach(io: File.open(thumbnail_file_full_path), filename: thumbnail_filename, content_type: "image/png")
+
+          ActiveRecord::Base.connection_pool.release_connection
+          ActiveRecord::Base.connection_pool.with_connection do
+            encode.assets.create(format: 'image', url: thumbnail_url)
+            encode.thumbnails.attach(io: File.open(thumbnail_file_full_path), filename: thumbnail_filename, content_type: "image/png")
+          end
           message = "Extracted #{i}th Thumbnail"
 
           cdn_bucket = ENV['CDN_BUCKET']