Retrieve indexed documents: Slack & PostgreSQL
Fires the moment a webhook arrives across Slack and PostgreSQL, looks the answer up in a vector store, then drops anything it has already handled. Built for embeddings, around a "List Changed Docs (API)" step, in 14 documented nodes.
Retrieve indexed documents with HTTP / REST API hands-free for Embeddings. An original, ready-to-import n8n workflow built around the 'RAG Pipeline' pattern for AI & automation. It fires on a webhook and orchestrates 14 nodes across Slack, HTTP / REST API, PostgreSQL. It uses n8n's LangChain AI nodes (Agent/Chain + chat model). Retry-on-fail is enabled on external calls. Import the JSON, add your credentials, and adapt the parameters. The result is a hands-off process that just works.
Key benefits
- ✓Keeps Slack and PostgreSQL in step for embeddings, without anyone re-typing a row
- ✓Safe to re-run: records already in Slack or PostgreSQL are skipped, across all 14 nodes of this embeddings build
- ✓A failed Slack or PostgreSQL call is retried rather than dropped, at any of the 14 nodes in this embeddings build
- ✓Embeddings answers come from your indexed content, not model recall, before reaching Slack
- ✓Pinned sample data ships with it — run all 14 nodes for embeddings before wiring Slack
Use cases
- →Teams keeping Slack and PostgreSQL aligned by hand for embeddings
- →Answering embeddings questions from your own indexed documents, then replying in Slack
- →Pushing embeddings events into Slack and PostgreSQL the moment they land, not on the next poll
- →Embeddings work where "List Changed Docs (API)" is still a manual step before Slack
Integrations
Workflow preview (14 nodes)
The template's actual node layout and connections. Node parameters and credential slots unlock with the download.
What's inside (14 nodes)
A look at the node types this workflow uses. No purchase required — full parameters and credentials are yours after you buy.
From download to running in 3 steps
- 1Import. In n8n, open Workflows → menu → “Import from File” and pick the downloaded JSON.
- 2Connect. Add your own credentials on the app nodes - n8n highlights exactly which ones need them.
- 3Activate. Run it once to test, then toggle Active. The automation is live.
What you'll learn
Core levelA compact production shape: validation and error handling without extra machinery.
- •Chunking documents with overlap and embedding them into a vector store
- •Embedding content and querying it back out of a vector store
- •Driving Slack from a webhook trigger
Every node carries its own documentation on the canvas, plus notes explaining why the architecture was built this way, a credential setup guide, troubleshooting, and three practice exercises. Sample data comes pinned to the trigger, so you can hit Execute and watch data flow before connecting a single account.
Common questions
What exactly do I get?
The complete, ready-to-import n8n workflow as a JSON file, delivered instantly after payment. Import it into your own n8n (cloud or self-hosted), add your credentials, and it runs.
How do I import it into n8n?
In n8n, open Workflows, click the three-dot menu, choose “Import from File”, and select the downloaded JSON. Then connect your own app credentials on the highlighted nodes.
Do I need anything else for it to work?
You need your own n8n instance and accounts/credentials for the apps this workflow connects to (Slack, HTTP / REST API, PostgreSQL). No coding is required.
What if it doesn't work for me?
If the file is faulty, won't import, or isn't as described, contact us within 7 days and we'll fix it or refund you - see our refund policy.
Can I modify or resell it?
You can freely adapt and use it in your own or your clients' projects. Reselling or redistributing the template file itself is not permitted.
Related templates
Retrieve questions from a knowledge base: Google Sheets for embeddings
Embeddings on n8n: runs when a webhook arrives across Google Sheets, Slack and PostgreSQL, starting at "List Changed Docs (API)". Looks the answer up in a vector store. 23 documented nodes.
Distill documents: Google Sheets & Slack for embeddings
Embeddings on n8n: runs when a webhook arrives across Google Sheets, Slack, Telegram and PostgreSQL, starting at "Keep Valid Documents". Scores the sentiment of every message. 22 documented nodes.
Answer questions from a knowledge base with Slack and PostgreSQL
Embeddings on n8n: runs when a webhook arrives across Slack and PostgreSQL. 14 documented nodes.
Query indexed documents: Slack, Google Sheets & Notion
Embeddings on n8n: runs when a webhook arrives across Slack, Google Sheets, Notion and PostgreSQL, starting at "Stamp & Shape Document". Looks the answer up in a vector store. 31 documented nodes.