comments: introduce lazy join of ChangesetStatus on ChangesetComment 99% of all uses of ChangesetComment will also need the optional corresponding ChangesetStatus (if any) on the status_change relationship. Fetching it on demand gives a lot of roundtrips and might be slow ... but adding explicit bulk queries everywhere do not seem feasible. Adding lazy=joined in the data model seems like the best solution. Loading a pull request with 10 comments on a slow repo goes from 3.5 s to 2.7 s.