Currently, the tenant_id on a delivery service create or update is optional in the Traffic Portal and the TO API. This presents a risk because failure to set the ds.tenant_id will allow all users to see that delivery service. This may include users that should have no access to this delivery service.
I suggest we make this a required field on create or update of a ds. At some point tenancy will be required but in the interim tenancy can be turned off using the use-tenancy=0 parameter.
If the desire is to not use tenancy, you can still set the ds.tenant = root tenant (which is provided via seeds.sql) and use-tenancy=0