Perhaps I should've said "the only piece of infrastructure that would ever use that database". DB browsing software and even ad-hoc scripts don't need a perfect schema; you can usually just grok it by visual inspection
Re:Databases always have a schema (2018)
by erik_seaberg on Wednesday February 27, 2019 @12:17PM
(#19264840)
That's a problem when we break something ad hoc the founder wrote to reconcile the books once per month. Data attracts surprising and important uses.
It's a mistake to make this assumption unless you've taken extreme measures to lock down and audit all access. It's pretty common for the entire dev team to have read access, and someone has inevitably built some ad hoc thing taking advantage of that.