Multiple tenants for user?

[weitzhandler]

Hi,

I'm uncertain regarding the TenantId column.
I'm thinking about having the system work in a many to many way, meaning each user can be connected to many tenants.
But this is also wrong, because the Users have to be isolated per tenant and can repeat themselves all over as long as the tenant is different.

The problem is how do I define global users, i.e. admins or other users that are in charge on any tenant.

What's the proper way to implementing that?