Running MySQL query

you'd want to backup your mysql databases before running mysql queries - especially if you're deleting data.

otherwise you could screw up your database and data

if you do not know how to backup your database via mysqldump, i'd read up on that first https://dev.mysql.com/doc/refman/5.6/en/mysqldump.html and bottom of page at https://centminmod.com/mysql.html

for running queries you can use mysql shell as outlined at https://dev.mysql.com/doc/refman/5.6/en/mysql.html

enter mysql shell

Code (Text):

mysql yourdatabasename

at mariadb or mysql shell prompt

Code (Text):

mariadb>> DELETE FROM xf_node_type WHERE node_type_id = 'WF_WidgetPage';
mariadb>> exit

or
SSH command line would be

Code (Text):

mysql -e "DELETE FROM xf_node_type WHERE node_type_id = 'WF_WidgetPage';" yourdatabasename