luigi: Read meta/export.json instead of relying on stamp files
Stamp files are only useful while building, and not copied to and from S3, so the check failed after a round-trip through S3.
Migrated from D8963 (view on Phabricator)
Staging instance, all changes can be removed at any time
Stamp files are only useful while building, and not copied to and from S3, so the check failed after a round-trip through S3.
Migrated from D8963 (view on Phabricator)