Add memory manager sub-node docs and make memory retriever sub-node deprecated

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

docs/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorychatretriever.md

@@ -4,6 +4,9 @@ description: Documentation for the Chat Messages Retriever node in n8n, a workfl
 ---
 
 # Chat Messages Retriever
+/// warning | Deprecated
+The Chat Messages Retriever node was removed from n8n in 1.26.0. It is still available in legacy workflows. Please use [Chat Memory Manager](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymanager) instead.
+///
 
 Use the Chat Messages Retriever node to retrieve data from an in-memory vector store.
 

docs/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymanager.md

@@ -0,0 +1,39 @@
+---
+title: Chat Memory Manager
+description: Documentation for the Chat Memory Manager node in n8n, a workflow automation platform. Includes details of operations and configuration, and links to examples and credentials information.
+---
+
+# Chat Memory Manager
+
+The Chat Memory Manager node is designed to manage chat message memories within your workflows. This node allows you to load, insert, and delete chat messages in an in-memory vector store.
+
+On this page, you'll find a list of operations that the Chat Memory Manager node supports, along with links to more resources.
+
+/// note | Examples and templates
+For usage examples and templates to help you get started, refer to n8n's [Chat Memory Manager integrations](https://n8n.io/integrations/chat-messages-manager/){:target=_blank .external-link} page.
+///	
+
+--8<-- "_snippets/integrations/builtin/cluster-nodes/sub-node-expression-resolution.md"
+
+## Node Parameters
+
+**Operation Mode**: Choose between `Get Many Messages`, `Insert Messages`, and `Delete Messages` operations.
+
+**Insert Mode**: (Shown in `Insert Messages` mode) Choose between `Insert Messages` to add alongside existing messages or `Override All Messages` to replace current memory.
+
+**Delete Mode**: (Shown in `Delete Messages` mode) Select either `Last N` to delete the last N messages or `All Messages` to clear all messages from memory.
+
+**Chat Messages**: (Shown in `Insert Messages` mode) Define the chat messages to insert into the memory, including message type (AI, System, User), message content, and visibility in UI.
+
+**Messages Count**: (Shown in `Delete Messages` mode and when `Last N` is selected) Specify the number of latest messages to delete.
+
+**Simplify Output**: (Shown in `Get Many Messages` mode) Toggle to simplify the output to include only the sender(ai, user, system) and the text.
+
+## Related resources
+
+View [example workflows and related content](https://n8n.io/integrations/chat-messages-manager/){:target=_blank .external-link} on n8n's website.
+
+Refer to [LangChain's Memory documentation](https://js.langchain.com/docs/modules/memory/){:target=_blank .external-link} for more information about the service.
+
+--8<-- "_snippets/integrations/builtin/cluster-nodes/langchain-overview-link.md"
+--8<-- "_glossary/ai-glossary.md"

docs/langchain/langchain-n8n.md

@@ -178,7 +178,7 @@ Learn more about [Text embeddings in LangChain](https://js.langchain.com/docs/mo
 
 #### Miscellaneous
 
-* [Chat Messages Retriever](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorychatretriever/)
+* [Chat Memory Manager](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymanager/)
 
 
 

mkdocs.yml

@@ -716,6 +716,7 @@ nav:
           - integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.lmopenhuggingfaceinference.md
           - integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorybufferwindow.md
           - integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorychatretriever.md
+          - integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymanager.md
           - integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymotorhead.md
           - integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memoryredischat.md
           - integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memoryxata.md