Do you have a documentation regarding SDP core tables? SDP has 1,500+ tables and it's difficult for us to create the right queries in our reports when we don't have any idea of what the table is for.

A simple list like this Service Now document would be helpful.
https://docs.servicenow.com/bundle/jakarta-platform-administration/page/administer/reference-pages/reference/r_TablesAndClasses.html

A user interface for table administration would be better as well.
https://docs.servicenow.com/bundle/jakarta-platform-administration/page/administer/table-administration/concept/c_TableAdministration.html