The reason I ask is that some users and I were currently trying to figure out how many migrated-in Questions go unloved. But the data to filter for migrated questions only is missing.
As we've been trying to cleanup questions and trying to do a bit of data-mining related to that effort I have noticed that quite a lot of records are omitted from the DE DBs. If nobody can answer why this information is missing, does anyone have a list of what information is present or missing (the mostly complete schema docs do not mention of what is omitted from the DE DBs).
We have not forgotten about this and nobody has given so much as a lousy non-answer response.