VbzCart/tables/ctg updates

About

 * Status: DISCARDED
 * Purpose: There may be a better way to do this, but haven't been able to figure it out yet. This table keeps track of the correspondence between {items as generated from the catalog title group data} and {items in }. Off the top of my head, I can't remember why we need to keep more fields than just ID_Item and IDS_Item, but I did look at this table very closely awhile back and ended up with all those extra fields still in it. TO DO: document why they're needed.
 * Fields:
 * isActive is necessary because otherwise there was no way to convey that a formerly-existing item is no longer active; while it should be possible to pull this information back out from when updating  from, the necessary join (showing all items in  not found in ) seems to take a prohibitively long time to run. Perhaps this can be optimized later, which would also eliminate the need for most of the fields in.
 * History:
 * 2009-07-02 This does not seem to be necessary; it was never implemented on Rizzo, and catalog building has happened without it.

SQL
CREATE TABLE `ctg_updates` ( ID_Item        INT NOT NULL AUTO_INCREMENT COMMENT "cat_items.ID",  IDS_Item       VARCHAR(63) NOT NULL UNIQUE COMMENT "cat_titles.ID + CatSfx",  isActive       BOOL NOT NULL DEFAULT FALSE COMMENT "current sources do generate a record for this item",  CatSfx         VARCHAR(31) DEFAULT NULL COMMENT "suffix which uniquely identifies this item's genome, so to speak, within all items for the same title",  CatNum         VARCHAR(63) NOT NULL COMMENT "CatNum = Title.CatNum + CatSfx",  ID_Title       INT DEFAULT NULL,  ID_CTG_Group   INT DEFAULT NULL,  ID_CTG_Title   INT DEFAULT NULL,  ID_CTG_Item    INT DEFAULT NULL,  ID_ItTyp       INT DEFAULT NULL COMMENT "needed for join with cat_items, even though it comes from ID_CTG_Item",  ID_ItOpt       INT DEFAULT NULL COMMENT "needed for join with cat_items, even though it comes from ID_CTG_Item",  PRIMARY KEY(`IDS_Item`), INDEX(`ID_Item`), INDEX(`CatNum`) ) ENGINE = MYISAM;