Website Downtime Alert via LINE + Supabase Log

Description

This workflow automatically checks the status of your websites using UptimeRobot API. If any site is down or unstable, it will:
Generate a natural-language alert message using GPT-4o
Push the message to a LINE group (with funny IT-style encouragement)
Log all DOWN status entries into your Supabase database
Wait 30 minutes before repeating

🔧 How It Works
Schedule Trigger – Runs on a fixed interval (every few minutes).
UptimeRobot Node – Fetches website monitor data.
Code Node (Filter) – Filters only websites with status 8 (may be down) or 9 (down).
IF Node – If any site is down, proceed.
LangChain LLM Node – Formats alert with a humorous message using GPT-4o.
Line Notify (HTTP Request) – Sends the alert to your LINE group.
Loop Over Items – Loops through all monitors.
Filter Down (Status = 9) – Selects only “fully down” sites.
Supabase Node – Logs these into synlora_uptime_down table.
Wait Node – Delays next alert by 30 minutes to avoid spamming.

⚙️ Setup Steps

Required:
🔗 UptimeRobot API Key
📲 LINE Channel Access Token and Group ID
🧠 OpenAI Key (GPT-4o Mini)
🗃️ Supabase Project & Table

Step-by-step:
Go to UptimeRobot → Get API key and ensure monitors are set up.
Create a Supabase table with fields: website, status, uptime_id.
Create a LINE Messaging API bot, join it to your group, and get:
Access Token
Group ID (userId or groupId)
Add your OpenAI API Key for GPT-4o Mini (or switch to your preferred LLM).
Import the workflow JSON into n8n.
Set credentials in all necessary nodes.
Activate the workflow.