Telegram Task Reminders in n8n: OpenAI + Data Table

Get Telegram task reminders with OpenAI + an n8n Data Table—automatically

This n8n workflow turns Telegram into a lightweight task manager: it extracts task details and deadlines from your messages using OpenAI, stores tasks in an n8n Data Table, lets you list/update tasks via commands, and sends Telegram reminders when deadlines are coming up within the next 30 minutes.

What this workflow does

• Listens for Telegram messages via a Telegram Trigger, then parses the command, message content, and chat ID.
• Handles /start by replying with usage instructions directly in Telegram.
• Creates tasks with /newtask: uses OpenAI to extract the task text and an ISO deadline from the user message, validates that the deadline is not in the past, and saves the task to the n8n Data Table.
• Lists tasks with /list: retrieves unfinished tasks for the current chat from the Data Table, formats deadlines for display, and sends the task list back in Telegram.
• Updates tasks with /updatetask: uses OpenAI to extract the task ID, the requested action (finish, change_deadline, remove), and an optional new deadline—then updates or deletes the matching Data Table row.
• Sends reminders on a schedule: runs every minute, finds unfinished and unnotified tasks whose deadlines are within the next 30 minutes, sends a Telegram reminder, and marks them as notified.

Use cases

• Operations teams capturing “do this by tomorrow” tasks directly from Telegram.
• SaaS operators maintaining a per-chat task queue with deadline-based nudges.
• Automation engineers testing reliable CRUD flows using n8n Data Table and OpenAI extraction.

Technical details

• Telegram Trigger + Telegram actions for replying and sending reminders.
• OpenAI extraction using available chat models: gpt-4.1-mini and gpt-5-mini.
• n8n Data Table for storing tasks (including unfinished and notified state).
• Logic built with nodes including if, set, switch, and date time (plus aggregation support).