Parses the raw MongoDB shell/Compass export (comments + ObjectId(...)
calls, not valid JSON), maps navn/email/telefon/afmeldt to the new
Participant model, filters out known test rows, and upserts on
(route_id, lowercased email) so re-running is safe. Excludes the raw
export (old_participants.json) from version control since it contains
real participants' personal data.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
