/*
Table: prodDepartmentHistory

Columns:
    prodDepartmentHistoryID int
    upc varchar(13)
    modified datetime
    dept_ID int
    uid int
    prodUpdateID int

Depends on:
    prodUpdate (table)

Use:
This table holds a compressed version of prodUpdate.
A entry is only made when an item's department setting
changes. uid is the user who made the change.
*/