Dear @raphaelblg,

thanks a lot for your message. Do you have an idea, which external service could trigger OPTIMIZE and register in the delta history as "auto"="true"?

The only thing I can definitely correlate with the onset of the auto OPTIMIZE is the change from DBR 13.3 LTS to DBR 14.3 LTS. Is there a new feature / behavior with respect to optimization of clustered tables that can cause this behavior? 

Thanks and best regards!