;; Biff transaction. See https://biffweb.com/docs/reference/transactions/
[{:db/doc-type :user
  :xt/id :db.id/user-a
  :user/email "a@example.com"
  :user/foo "Some Value"
  :user/joined-at :db/now}
 {:db/doc-type :msg
  :msg/user :db.id/user-a
  :msg/text "hello there"
  :msg/sent-at :db/now}]