Insert_many - ids of created rows
I suppose, the reason I had not added that was out of memory considerations but on the whole I think that even if you were inserting a very large number of rows, it would be ok to keep the list of IDs around.
 Actually, because the insert will in most cases be only a single statement, there is not a way to efficiently get the PK of all the inserted rows.

Is it possible to get newly created ids, when creating rows via insert_many ?
