Overhaul of prodUpdate compression and archiving:
New task replaces three existing CompressProdUpdate tasks
New ID columns all over the place
With schema updates, prodUpdateArchive can be deprecated. After
database updates, running the new task manually* may be a good
idea. It needs to rebuild prodPriceHistory and prodDepartmentHistory
from scratch to assign foreign keys correctly.

* command: php FannieTask.php ProdUpdateMaintenanceTask