When a workspace hasn't run the v1.18 migration yet, the throttleRetryAfter field metadata doesn't exist. The formatData utility was throwing an error when encountering fields without metadata, crashing the entire message import job. Changed to gracefully skip fields without metadata, as these fields won't exist in the database either during the migration transition. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>