The problem with optimizing indexes is if you don't control every query, and another team goes and writes an unoptimal variant in their code. You, of course, will not discover this until weeks later in an outage.
baweaver.com/writing/2026...
Queries own the reads the way commands own the writes, and a T::Struct is the only thing that crosses between them. Every read here ran against ActiveRecord 8.1 before it went in.
