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When saving a page with a Category: link on a PostgreSQL-powered wiki, the save fails trying to touch the category page for 
cache purging:

Warning: pg_query() [function.pg-query]: Query failed: ERROR: invalid input syntax for type timestamp: "20040906083948" in /
var/www/html/gres/includes/DatabasePostgreSQL.php on line 96
A database error has occurred Query: UPDATE cur SET cur_touched='20040906083948' WHERE cur_namespace='14' AND 
cur_title='Cats' Function: Title::invalidateCache Error: 1 ERROR: invalid input syntax for type timestamp: "20040906083948"

Backtrace:

    * DatabasePostgreSQL.php line 366 calls wfDebugDieBacktrace()
    * Database.php line 297 calls DatabasePostgreSQL::reportQueryError()
    * Database.php line 777 calls DatabasePostgreSQL::query()
    * Database.php line 767 calls DatabasePostgreSQL::update()
    * Title.php line 652 calls DatabasePostgreSQL::updateArray()
    * LinksUpdate.php line 154 calls Title::invalidateCache()
    * index.php line 195 calls LinksUpdate::doUpdate()