Feature #17613
Updated by Peter Amstutz over 3 years ago
* Filled in with same logic as "modified_by_user_uuid"
* read only field on the arvados object
* migration uses the logs table if possible, fills in "system user" if not
* requires updating API version
* requires updating Controller structs
* need to consider how this works with past version snapshots made by collection versioning
** should follow whatever logic we decided on with "created_at"