hahaha.sql

select * from django_snailtracker_action as ac
join django_snailtracker_snailtrack as st on st.id = ac.snailtrack_id
join django_content_type as ct on st.content_type_id = ct.id
where ct.model = 'supplier' and '"invoiced"' in (select value::text from json_array_elements(columns_changed::json));