id	summary	reporter	owner	description	type	status	priority	milestone	component	resolution	keywords	cc	parents
5453	migration will fail when disable a previously enabled plugin	宋文武		"steps:
  Enable mediagoblin.media_types.blog.
  Run gmg dbupdate, OK.
  Disable mediagoblin.media_types.blog.
  Run gmg dbupdate, FAIL.
with Traceback:
  KeyError: '562bc42a8fff'...
  alembic.util.CommandError: Can't locate revision identified by '562bc42a8fff'...

After search, it's same as:
https://stackoverflow.com/questions/32311366/alembic-util-command-error-cant-find-identifier

If I delete '562bc42a8fff' from the alembic_version table manually,
it will works."	defect	closed	major		programming	duplicate