Important: #98475 - Unsigned "pid" table columns

See forge#98475


When upgrading to TYPO3 v12, the install tool database analyzer will change the column field pid of various tables to UNSIGNED: They no longer accept negative values.

Negative pids were needed until TYPO3 v10 in combination with workspaces, the Core nowadays only inserts rows with positive integers or 0 (zero) as pid value. An upgrade wizard took care of updating affected rows when upgrading to v10, current databases shouldn't contain such rows anymore.