How can I find what options or plugins are taking up all that size? It's not transients because after deleting all it's still 13GB.
SELECT option_name, option_value FROM hihgv_options WHERE autoload = 'yes'
Returns 833 rows in 0.141 sec
SELECT SUM(LENGTH(option_value)) as autoload_size FROM hihgv_options WHERE autoload='yes';
At one point it was 13GB and went down to MB when I move everything from the My Custom Functions plugin to the child theme's functions.php file.