%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    autonumber
    participant FE as Frontend (React)
    participant BE as Backend API
    participant ER as Error Receiver (errors.tdvorak.dev or :8083)
    participant EV as Error Review Admin UI

    Note over FE: JS errors captured (window.onerror,<br/>unhandledrejection, manual report)
    FE->>BE: POST /api/v1/errors {event}
    BE->>BE: RateLimit(120/min)
    BE->>BE: Validate & normalize
    alt External ingest configured
      BE->>ER: POST /api/v1/errors (Bearer/X-Ingest-Token)
      ER-->>BE: 202 Accepted {request_id}
    else Local DB fallback
      BE->>BE: Store as ErrorEvent (DB)
    end
    BE-->>FE: 200 OK

    Note over ER,EV: Admin inspects
    EV->>ER: GET /admin/api/errors
    ER-->>EV: List, details

    rect rgba(240,240,255,0.2)
    Note over BE,EV: Auto-register monitor (background)
    BE->>ER: Register/heartbeat monitor (retry)
    EV->>ER: Autologin redirect injects token (local dev)
    end