sensor_configuration_optional

element_name	kind	external_table	description
sensor_id	varchar	sensor_configuration:sensor_id	Link to sensor for which this entry corresponds
kind	int	kind:kind	Enumerated data type (numeric, int, etc)
field	varchar	sensor_configuration_fields:field_id	Field that this entry corresponds to
value	varchar		Kind inherited from field
comments	varchar		Any additional comments.