Sequence · Generic registration

sequenceDiagram
  autonumber
  actor U as User
  participant A as App
  participant B as Backend
  participant DB as Database
  U->>A: submit registration
  A->>B: POST /register
  B->>B: validate input
  B->>DB: check email unique
  DB-->>B: not found
  B->>DB: insert user
  DB-->>B: ok
  B-->>A: 200 OK
  A-->>U: show success