Gabriel Chang

We should also combine the columns e.g. ungraded missions a/b where a is ungraded missions and b is submitted missions

As an add on, I feel that it could be possible that after the refactor `submissions_by_grader_for_index`'s count query can go before the submissions query such that there is less repeated...

Changed back to draft as I would like to update notification links as well. @RichDom2185 any ideas on how would I get frontend url, is there an env variable I...

TODO: - Update unsubscribe link - Update url builder to use frontend url (Currently hardcoded to sourceacademy)