In general, you should look at every table that has data in it, however, the following tables are the most important to review:
- SELECT * FROM __M_Users
- SELECT * FROM __M_CustomObject_Definitions
- SELECT * FROM __M_CustomField_Definitions
- SELECT * FROM __M_Documents_Digital_Categories
- SELECT * FROM __M_Documents_Digital_Files
- SELECT * FROM __M_Documents_Digital_Files_Versions