The SQL Curves are a new feature introduced in Clarity 15.9.1, together with a new job Time Slicing Group By
How can this feature be disabled?
Release : 15.9.1+
Component : CA PPM TIME SLICING
select enabled from CMN_FEATURES where code ='TSV_AGGREGATION_FEATURE_20550'
This step is required for the setting change to be completely taken into account
Note: Disabling the SQL Curves feature will also make the Time Slicing Group By job not visible in Administration - Reports and Jobs
The issue is resolved in 188.8.131.52+
Here is additional information on Time Slicing Group by job: Time Slicing Group By job - what it does?