Invitations #

Invitations are a bundle of registrations that can managed together. They underlie license keys, for instance, but are usable separately.

erDiagram "REGISTRATION" ||--o| "INVITATION" : "registrations created as part of an invitation will include the invitation ID" "REGISTRATION" ||--o| "COURSE" : "" "INVITATION" ||--|{ "COURSE" : "" "INVITATION" ||--|{ "USER" : ""