File versioned_update_old_row.py

examples/versioned_rows/versioned_update_old_row.py:None–None

"""Illustrates the same UPDATE into INSERT technique of ``versioned_rows.py``,
but also emits an UPDATE on the **old** row to affect a change in timestamp.
Also includes a :meth:`.SessionEvents.do_orm_execute` hook to limit queries
to only the most recent version.