Move import logic to class
Define import status
CSV import returns a status
Data importer receives a status from the class
Rename references to the @ar_class
Create a class to handle logging during imports
WIP count_status
Read row duck type now injects a logger
Setting time in logger initialisation
Replace put_message with notice
Implement warn and error level logging
Use error levels in logging
Keep the hash of unique keys in the importable