What typical database subschemas are found in the database schemas of most information systems/websites?

Question

Database design

As I studied databases, I noticed that most information systems / sites have a similar set of subschemas of the overall database schema.
Specifically, I noticed that many ISs (more precisely, their databases) have the following database subschemes:
- access control model (most often RBAC or DAC),
- settings management,
- logging system.
Are there any other areas that are embodied in database schemas in different information systems and sites?