sequenceDiagram
  actor User
  participant UI as Frontend
  participant API as Backend resource GET
  participant DB as Local store
  participant TB as T-Bank

  User->>UI: Open screen or retry HTTP read
  UI->>API: GET resource
  API->>DB: Authorize current connection and read saved result/status
  DB-->>API: data, resource state, last hourly attempt
  API-->>UI: 200 { data, meta } or boundary Problem Details
  Note over API,TB: No T-Bank call and no personal sync work from GET or retry