The schemas can be found for each version of Clarity under Reference/Clarity Advanced Reporting and Database Schema Index.
On this link you will be able to download the various schemas.
Here is the link to the 15.9.3 version
In addition there is a Jaspersoft report you can run and can filter for specific tables as well. That report information is found in the documentation under
Advanced Reporting with Jaspersoft / PMO Accelerator Advance Reporting Content / PMO reports: Administration Reports - -
The Data Warehouse as well as the Clarity schemas are available here.
Release : 15.9.3
Component : CLARITY JASPERSOFT
Schemas can be found in the documentation