Send multi-tenant reminders via Telegram from webhooks and schedule with Postgres logging

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How it works Any external system triggers a reminder via webhook with a tenant token — the workflow validates the token, fetches the tenant's channel config and message template from PostgreSQL, renders the message with event variables, and sends it immediately A schedule trigger runs every minute and queries events approaching their deadline window per tenant — idempotency via a reminders_sent table ensures the same reminder is never sent twice A built-in n8n form lets you register new tenants