ДМ
update set
contact_name = excluded.contact_name,
company = excluded.company,
contact_group = excluded.contact_group,
email = excluded.email,
account_name = excluded.account_name,
job_title = excluded.job_title;
Подробности: Failing row contains (null, null, null, null, null, null, null, null, null, null, 68, 0). Хотя UserId в json у меня не не null