These data points are parsed in the Salv system. This means you can query the information contained in these data points without having to look at JSON data. If the field is not parsed, this is how you query that data point:
select attributes::json->>'relevant_datapoint'
from transaction where customer_id=$organisationId
and attributes::json->>'relevant_datapoint'='content'
List of indexed data points:
external_id (this is the ID that was sent from your system to Salv)
type
status
timestamp (system will accept queries with 'yyyy-mm-dd' or 'Month dd, yyyy' but NOT dd/mm/yyyy)
amount
reference
sender_name
receiver_name
receiver_account
direction