Sharer
Project
Role
Inbox
Outbox
FollowerSet

Repo
    ident      RpIdent
    sharer     SharerId
    vcs        Text
    project    ProjectId            Maybe
    desc       Text                 Maybe
    mainBranch Text
    collabUser RoleId               Maybe
    collabAnon RoleId               Maybe
    inbox      InboxId
    outbox     OutboxId
    followers  FollowerSetId

    UniqueRepo ident sharer
    UniqueRepoInbox inbox
    UniqueRepoOutbox outbox
    UniqueRepoFollowers followers