How to remove magento 2 modules / extensions totally from DB?
You have to delete the attribute which is created from the remove extension(3rd party extension).
Magento saves the attribute basic related at database table eav_attribute.
So you have to run below query for identifying that attribute
SELECT * FROM eav_attribute WHERE source_model = 'MageWorx\SeoBase\Model\Source\MetaRobots'.
You have to delete this attribute from database.
After that flush cache.