今だけよ
$ heroku config:set SAFETY_ASSURED=1
Issueとして報告しました。strong_migrationsまた上がったのかな？
github.comChangeUserIdNonnullable is now detected unsafe · Issue #12768 · tootsuite/mastodonExpected behaviour rake db:migrate completes successfully. Actual behaviour strong_migration complains about expensive migration: : Migrating to ChangeUserIdNonnullable (20180206000000) == 20180206...