{"library":"langchain-postgres","install":[{"cmd":"pip install -U langchain-postgres","imports":["from langchain_postgres import PGEngine","from langchain_postgres import PGVectorStore","from langchain_postgres.chat_message_histories import PostgresChatMessageHistory","from langgraph.checkpoint.postgres import PostgresSaver","from langchain_postgres.vectorstores import PGVector"]},{"cmd":"pip install -U 'langchain-postgres[psycopg]' # for psycopg3 driver","imports":[]},{"cmd":"pip install -U 'langchain-postgres[asyncpg]' # for asyncpg driver","imports":[]}]}