Gen-AI Developer Classroom notes 11/Nov/2025

Memory in langgraph

• While building graphs, we have two types of memories
  • short term memory: thread specific
  • long term memory: user specific

• Refer Here for official docs.

• Short term memory with checkpointer will add all the previous conversations to the messages, increasing cost and at some point will break due to token length restrictions.

  • Deleting Messages (only 5 recent)
  • Restrict based on token count.
  • Summarize to restrict

Longterm memory using langgraph

• Lets setup postgres on your system.

• Install docker desktop

  • winget winget install -e --id Docker.DockerDesktop
  • homebrew brew install --cask docker

• Linux

docker run -d \
  --name postgres15 \
  -e POSTGRES_USER=postgres \
  -e POSTGRES_PASSWORD=password \
  -p 5432:5432 \
  postgres:15

• Windows
• Linux

docker run -d `
  --name postgres15 `
  -e POSTGRES_USER=postgres `
  -e POSTGRES_PASSWORD=password `
  -p 5432:5432 `
  postgres:15

• To connect to postgres lets use Azure DataStudio

• In the virtual environment add uv add langgraph-checkpoint-postgres

• Refer Here for memory

Langmem

• Langmem is opensource library by langchain for memory based opeartions