StockType.pricechanged is a timestamp for the last time the price of a stock type was changed. It was introduced in 84b700be0f4a5ea2352d74dbbdbfdd6eb5787a29 when the sale price was changed from being set per stock item to being set per stock type. Although it has been set on each price change, there's never been any code that makes use of it or displays it, and it's now been obsoleted by the general log system. Delete it.
StockType.pricechangedis a timestamp for the last time the price of a stock type was changed. It was introduced in 84b700be0f4a5ea2352d74dbbdbfdd6eb5787a29 when the sale price was changed from being set per stock item to being set per stock type. Although it has been set on each price change, there's never been any code that makes use of it or displays it, and it's now been obsoleted by the general log system. Delete it.