Node-RED widget UI Alarmlist

Displays a list of active alarms. Each alarm is stored in a local SQLite database and remains visible until it is explicitly reset. Alarms persist across Node-RED restarts.

Requires

• Node-RED ≥ 3.0.0 – required for Dashboard 2 widget support
• Node.js ≥ 22.5.0 – required for built-in node:sqlite module

Usage

The node accepts messages with the following structure:

• msg.payload.alarm.text → Adds or updates an active alarm.
• msg.payload.alarm.reset: true → Removes the alarm with the same text.

Node properties

Title
Defines the widget header text in the dashboard.

Data persistence

Active alarms are saved in a SQLite database located at <userDir>/alarmlist.sqlite.

By default, userDir points to ~/.node-red/. If Node-RED is configured with a custom userDir in settings.js, the database will be created there instead.

The database contains two tables

• alarms – holds the currently active alarms
• alarms_history – logs every alarm activation and reset with timestamps

Input format

Set alarm

{
  "payload": {
    "alarm": { "text": "Motor 1 överhettad" }
  }
}

Reset alarm

{
  "payload": {
    "alarm": { "text": "Motor 1 överhettad", "reset": true }
  }
}