Upgrade to Rails 6.1 and apply new framework defaults

config/puma.rb

@@ -8,6 +8,11 @@ max_threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
 min_threads_count = ENV.fetch("RAILS_MIN_THREADS") { max_threads_count }
 threads min_threads_count, max_threads_count
 
+# Specifies the `worker_timeout` threshold that Puma will use to wait before
+# terminating a worker in development environments.
+#
+worker_timeout 3600 if ENV.fetch("RAILS_ENV", "development") == "development"
+
 # Specifies the `port` that Puma will listen on to receive requests; default is 7000.
 #
 port        ENV.fetch("PORT") { 7000 }