Based on my understanding, it's stored in the SharePoint Config DB but I couldn't find it. It's not found in the "Objects" table nor at any other table.
The background is I need to execute this Microsoft-provided PowerShell script. It fixes the SharePoint OOTB Workflow issue that surfaced after applying the Sep 2018 security patches. Before executing the said script, I'm trying to identify the items that I need to backup such as web.config. I was thinking whether I should backup the SharePoint Config DB also.