Yup, there's definitely something still wrong. I put the "classes" app to inactive, I then deleted it, and then I even deleted it from the "downloaded apps" menu. But I'm still getting a database error email every once in a while.

Query:

SELECT * FROM `bx_classes_classes` INNER JOIN `bx_classes_meta_keywords` ON `bx_classes_meta_keywords`.`object_id`=`bx_classes_classes`.`id`WHERE 1 AND `bx_classes_classes`.`status` ='active' AND `bx_classes_classes`.`status_admin` ='active' AND `bx_classes_meta_keywords`.`keyword` ='Verified Sellers' LIMIT 0, 4

Mysql error:

Table 'indiesel_una566.bx_classes_classes' doesn't exist

collation_connection:

utf8mb4_unicode_ci