Improve loaders to deal with new visit status events
The model and db now supports the not_found and failed status. Update the loader implementations to reference such information.
Note: It's also the opportunity to make the loader reference the visit-status type when discussing with the storage [1]
This is a state diagram explaining the different statuses :
- [1] !170 (closed)
Migrated from T3030 (view on Phabricator)
Edited by Phabricator Migration user