langchain-postgres

The

package implementations of core LangChain abstractions using

Postgres

.

The package is released under the MIT license.

Feel free to use the abstraction as provided or else modify them / extend them as appropriate for your own application.

Requirements

The package currently only supports the psycogp3 driver.

Installation

Change Log

0.0.6:

• Remove langgraph as a dependency as it was causing dependency conflicts.
• Base interface for checkpointer changed in langgraph, so existing implementation would've broken regardless.

Usage

ChatMessageHistory

The chat message history abstraction helps to persist chat message history in a postgres table.

PostgresChatMessageHistory is parameterized using a

and a

session_id

.

The

is the name of the table in the database where the chat messages will be stored.

The

is a unique identifier for the chat session. It can be assigned by the caller using

uuid.uuid4()

.

Vectorstore

See example for the PGVector vectorstore here