I was doing a some LTI work and noticed some columns that existed in previous versions that didn't exist in current. I find it semi difficult to read the LTIService.java so it looks like they probably should be cleaned up by conversion scripts in 12 but was just double checking, added suggestions.
alter table lti_tools drop column enabled_capability;
alter table lti_deploy drop column allowlori;
alter table lti_tools drop column allowlori;
https://jira.sakaiproject.org/browse/SAK-24149 (This one is pretty obvious)
drop table lti_mapping;