This SO question is clearly a candidate for Meta, but I have to go read it to see if it was only closed, or migrated to where it belongs. Can't the text say [migrated to meta] instead of [closed] when that's what has happened?
This would require denormalizing the value, which isn't worth it IMO.
Clicking through will show you exactly what happened.
edit: we did eventually denormalize this as MigrationDate, and there are lots more migrations now that we have 40+ sites, so -- implemented as