http://dacxzjk3kq5mmepbdd3ai2ifynlzxsnpl2cnkfhridqfywihrfftapid.onion/help/update/background_migrations.md
For example:
sudo gitlab-rake gitlab:background_migrations:finalize[CopyColumnUsingBackgroundMigrationJob,ci_builds,id, '[["id"\, "stage_id"]\,["id_convert_to_bigint"\,"stage_id_convert_to_bigint"]]' ]
Mark a failed migration finished
Contact GitLab Support before using
these instructions.