id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
27500	Warn about potentially significant performance degrading schema changes when making/running migrations	Oliver Bristow	nobody	"Today we ran a migration which removed a unique=True constraint on a char field for a MySQL database, this implicitly removed the indexing on the column which caused significant performance problems.

It didn't take too long to work out the mistake, but it would be nice if there was more of a fuss made when things like (implicit) index removal occur.

Hopefully this way developers are less likely to overlook or not be aware of such things, and also help pinpoint the source of an issue after an update."	New feature	closed	Migrations	1.8	Normal	wontfix			Unreviewed	0	0	0	0	0	0