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
21889	Record hash of applied migrations	thomasf@…		"Simple list spec:
* After an migration has been applied its hash is stored in the migration table
* The hash value could probably just be a file hash of the migration python source file
* Before new migrations are applied all previous migrations should be checked to not only have the correct id but also the same content.
* Migration modification without triggering any hash errors (like documentation only updates) can be supported using a hash property on the migration model that allows the developer to let the migration keep its previous hash.
* An --force-update-migration-hash option can be added the migration command for an explicit ""i don't care' situation. 

I've seen this other database migration frameworks and it has been a very useful thing to have at times. 
"	New feature	closed	Migrations	dev	Normal	wontfix			Unreviewed	0	0	0	0	0	0