From discussion on Discord:
If you want to automatically set a column to a session variable (such as the current X-Hasura-User-Id), you can do this on INSERT with the column presets functionality below
https://docs.hasura.io/1.0/graphql/manual/schema/default-values/column-presets.html

Is there a specific reason, why the same functionality is not supported on UPDATE? If not, could this feature be added?
My use case: User A creates record 1. User B later updates record 1. Ideally, there is a column who tracks who created and who last edited the record.