Schema inconsistent: several columns difference on "not null"

Found this schema module complains after D5 to D6 upgrade.

project_release_supported_versions
column recommended_release - difference on: not null
declared: array('description' => t('TODO: please describe this field!'), 'type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0)
actual: array('description' => t('TODO: please describe this field!'), 'type' => 'int', 'unsigned' => TRUE, 'not null' => FALSE, 'default' => 0)
column latest_release - difference on: not null
declared: array('description' => t('TODO: please describe this field!'), 'type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0)
actual: array('description' => t('TODO: please describe this field!'), 'type' => 'int', 'unsigned' => TRUE, 'not null' => FALSE, 'default' => 0)
column latest_security_release - difference on: not null
declared: array('description' => t('TODO: please describe this field!'), 'type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0)
actual: array('description' => t('TODO: please describe this field!'), 'type' => 'int', 'unsigned' => TRUE, 'not null' => FALSE, 'default' => 0)

We should run an update hook and correct the 'not null' and descriptions to make the schema consistent.