FIX: only attempt old rebakes a maximum of 3 times

app/models/post.rb

@@ -480,6 +480,16 @@ class Post < ActiveRecord::Base
         p.rebake!
       rescue => e
         problems << { post: p, ex: e }
+
+        attempts = p.custom_fields["rebake_attempts"].to_i
+        if attempts > 3
+          p.update_columns(baked_version: BAKED_VERSION)
+          Discourse.warn_exception(e, "Can not rebake post# #{p.id} after 3 attempts, giving up")
+        else
+          p.custom_fields["rebake_attempts"] = attempts + 1
+          p.save_custom_fields
+        end
+
       end
     end
     problems