Deck
Role
OutboxItem
Outbox
Inbox
FollowerSet

Repo
    vcs        VersionControlSystem
    project    DeckId               Maybe
    mainBranch Text
    collabUser RoleId               Maybe
    collabAnon RoleId               Maybe
    actor      ActorId
    sharer     SharerId

    UniqueRepoActor  actor

Sharer
    ident   ShrIdent
    name    Text     Maybe
    created UTCTime

    UniqueSharer ident

Actor
    name      Text
    desc      Text
    createdAt UTCTime
    inbox     InboxId
    outbox    OutboxId
    followers FollowerSetId

    UniqueActorInbox     inbox
    UniqueActorOutbox    outbox
    UniqueActorFollowers followers