/*
Table: prodPriceHistory

Columns:
    prodPriceHistory int
    upc varchar(13)
    modified datetime
    price decimal(10,2)
    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 regular price setting
changes. uid is the user who made the change.
*/