robhudson/zamboni — comment on commit 522081ef3605cdea43d7c926942f139f077d9e50
File: migrations/283-files-add-binary.sql line 4
By robhudson:

It's a single time slow, though. Are slow migrations problematic?

I considered keeping it as a denormalized field but felt it really belonged on the file and a cached property on addon would suffice.