move changed count and screenshot logic to model

app.rb

@@ -309,14 +309,9 @@ post '/site_files/upload' do
   end
 
   sanitized_filename = params[:newfile][:filename].gsub(/[^a-zA-Z0-9_\-.]/, '')
+
   current_site.store_file sanitized_filename, params[:newfile][:tempfile]
-
-  if sanitized_filename =~ /index\.html/
-    ScreenshotWorker.perform_async current_site.username
-    current_site.update site_changed: true
-  end
-
-  current_site.update changed_count: 1+current_site.changed_count, updated_at: Time.now
+  current_site.increment_changed_count
 
   flash[:success] = "Successfully uploaded file #{sanitized_filename}."
   redirect '/dashboard'

models/site.rb

@@ -128,6 +128,18 @@ class Site < Sequel::Model
   def store_file(filename, uploaded)
     FileUtils.mv uploaded.path, file_path(filename)
     File.chmod(0640, file_path(filename))
+
+    if filename =~ /index\.html/
+      ScreenshotWorker.perform_async values[:username]
+      self.site_changed = true
+      save(validate: false)
+    end
+  end
+  
+  def increment_changed_count
+    self.changed_count += 1
+    self.updated_at = Time.now
+    save(validate: false)
   end
 
   def files_zip