Fix recursive call

app/models/deployment.rb

@@ -163,13 +163,17 @@ class Deployment < ActiveRecord::Base
   def finished_at
     return self.created_at if status.nil?
-    self.finished_at
+    read_attribute(:finished_at)
   end
-  def formatted_deployment_time
+  def deployed_at
     return unless success?
-    finished_at.to_time.in_time_zone.to_s(:medium)
+    finished_at
+  end
+
+  def formatted_deployment_time
+    deployed_at&.to_time&.in_time_zone&.to_s(:medium)
   end
   def has_metrics?