flowchart TD
    NEW["New diagnosis persisted"]
    NEW --> DQ{"alertingDisabled?"}
    DQ -->|"Yes"| TRACK{"tracking_issue?"}
    TRACK -->|"Yes"| PASS["Pass through
(tracking always alerts)"]
    TRACK -->|"No"| SUPPRESS["Suppress all alerts"]
    DQ -->|"No"| SCORE
    subgraph SCORE["alert_score = geometric mean (4th root)"]
        S1["impact
recoverableRevenue % of MRR"]
        S2["confidence
rank-1 userFacingConfidence"]
        S3["actionability
0.1 / 0.7 / 1.0 by template count"]
        S4["freshness
decay on detected_at"]
        S1 & S2 & S3 & S4 --> GEOM["(S1·S2·S3·S4)^0.25"]
    end
    GEOM --> THRESH{"Severity band?"}
    THRESH -->|"critical / high"| FULL["Email + In-app + Webhook"]
    THRESH -->|"medium"| INAPP["In-app only"]
    THRESH -->|"low"| NONE["Inbox only (no alert)"]
    PASS --> INAPP
    FULL --> REC[(posthog_alerts)]
    INAPP --> REC
    style GEOM fill:#c8e6c9
    style SUPPRESS fill:#ffcdd2
    style REC fill:#fff8e1,stroke:#FFC107