RemoteActor
RemoteActivity

Collab

CollabFulfillsInvite
    collab CollabId

    UniqueCollabFulfillsInvite collab

CollabRecipRemote
    collab CollabId
    actor  RemoteActorId

    UniqueCollabRecipRemote collab

CollabRecipRemoteAccept
    collab CollabRecipRemoteId
    invite CollabFulfillsInviteId
    accept RemoteActivityId

    UniqueCollabRecipRemoteAcceptCollab collab
    UniqueCollabRecipRemoteAcceptAccept accept