# Alarm And Notification Flow

## Device Alarm To User Notification

```mermaid
sequenceDiagram
  autonumber
  participant Device as TalkingQ device
  participant MQTT as MQTT broker
  participant Handler as TalkingQMQTTService
  participant Alarm as Alarm service
  participant Location as Location snapshot
  participant DB as device_alarm_events
  participant Banner as system banner polling
  participant Mini as banban-mini
  participant WxMP as WeChat Official Account
  participant SMS as SMS provider

  Device->>MQTT: alarm event msg_id=010
  MQTT->>Handler: deliver alarm payload
  Handler->>Alarm: create alarm event
  Alarm->>Location: attach current location snapshot if available
  Alarm->>DB: insert device_alarm_events
  Alarm->>WxMP: schedule/send template notification if bound
  Alarm->>SMS: send SMS if phone notification is enabled
  Banner->>DB: poll latest/new alarm
  Mini->>Banner: show banner / alarm history on device home
  Handler-->>MQTT: alarm event_resp
```

## Supporting Notification Bind

```mermaid
flowchart TD
  Mini["banban-mini management page"]
  Phone["WeChat phone authorization"]
  WxBind["WeChat MP bind start/status"]
  Backend["talkingq-url wechat-mp routers/services"]
  Parent["parents / parent_wechat_* tables"]
  Notify["wechat_mp_notification_service"]

  Mini --> Phone --> Backend --> Parent
  Mini --> WxBind --> Backend --> Parent
  Parent --> Notify
```

## Key Tables

```mermaid
erDiagram
  device_auth ||--o{ device_alarm_events : reports
  children ||--o{ device_alarm_events : alarm_owner
  parents ||--o{ parent_wechat_accounts : mp_account
  parents ||--o{ parent_wechat_identities : wx_identity
  parents ||--o{ wechat_mp_bind_states : bind_state

  device_alarm_events {
    int id PK
    varchar device_id FK
    int child_id FK
    varchar source_msg_id
    decimal location_lat
    decimal location_lng
    datetime location_updated_at
    datetime created_at
  }
```

## Source Anchors

- Alarm schema: `database/talkingq_shared_schema.sql`
- Alarm location refresh tests: `talkingq-url/tests/test_alarm_gps_location_refresh.py`
- System banner client: `banban-mini/src/services/system-banner.ts`
- Device home alarm UI: `banban-mini/src/pages/device/index.tsx`
- WeChat MP notification service: `talkingq-url/banban/service/wechat_mp_notification.py`