I may have worked with that one. Did it have a parallel schema that mapped tables and fields with legible/customisable names, so every SQL call had to join the mapping tables to hit the required table and fetch the fields you were after?

Wrote a Windows .Net program once upon a time to convert the data from other financial CRM systems into the system I worked on. Built a data mapping tool as no customer we onboarded placed "custom" data in the same tables or fields even when using the same financial system.

I actually miss doing that kind of work, my brain seems to be wired to find it fun. Writing SQL is one thing I don't delegate to an AI or even an ORM like Doctrine.