add a blurb about the sometimes-expensive db migration
add a blurb about the sometimes-expensive db migration

CloudCredo/concourse,concourse/concourse,cjcjameson/concourse,cjcjameson/concourse,CloudCredo/concourse,zachgersh/concourse,longnguyen11288/concourse,concourse/concourse,longnguyen11288/concourse,concourse/concourse,zachgersh/concourse,CloudCredo/concourse,concourse/concourse,concourse/concourse,cjcjameson/concourse,zachgersh/concourse,longnguyen11288/concourse