20 year old BI app. Columnar DBs weren't really a thing. (MonetDB was brand new but not super stable. I committed the SQLAlchemy interface to it.)
But that follows A and A+ which were extremely column oriented and date to early 1990s or even late 1980s ; and to various APL implementations going back to the 1960’s
Columnar DBs were very much a thing among APL users (finance and operations research) but weren’t really known outside those fields - and even in those fields, there was a period of amnesia in the late ‘90s/early 2000’s