sequenceDiagram
  autonumber
  actor User
  participant App as Auxy App (FastAPI)
  participant Gemini as Vertex AI (Gemini)
  participant LB as LinkBERT Service
  participant DB as Database (Postgres)

  User->>App: Request link optimization
  par Concurrent Analysis
    App->>Gemini: Classify Money vs Filler Links
    Gemini-->>App: Money + Other Links
  and Link Scoring
    App->>LB: Score text
    alt Service Down or Timeout
      LB--xApp: HTTPError / Timeout
      App->>App: Fallback to empty scores & spans
    else Normal Response
      LB-->>App: words, probs, spans
    end
  end
  App->>DB: Save run (links + LinkBERT data)
  App-->>User: 200 OK (Clean text + classifications)