Run scheduler in a separate process

app/config.ru

@@ -2,6 +2,5 @@
 
 require './config/environment'
 require 'api'
-require 'schedule'
 
 run Sinatra::Application

app/config/unicorn.rb

@@ -9,3 +9,8 @@ timeout 10
 before_fork do |_, _|
   Sequel::DATABASES.each(&:disconnect)
 end
+
+fork do
+  require_relative 'environment'
+  require 'schedule'
+end

app/lib/schedule.rb

@@ -8,3 +8,5 @@ schedule = Rufus::Scheduler.new
 schedule.cron '*/15 15,16,17 * * 1-5' do
   Bank.fetch_current_rates!
 end
+
+schedule.join