langgraph-checkpoint-supabase 0.1.0

LangGraph checkpoint saver backed by Supabase (Postgres via PostgREST).

langgraph-checkpoint-supabase

A LangGraph checkpoint saver backed by Supabase — persist agent state to Postgres through PostgREST, with no direct DB connection required.

There's an official-feel checkpointer for nearly every backend LangGraph users reach for (Postgres, SQLite, Redis, MongoDB, MySQL, DynamoDB, Firestore, S3, Django...) but, as of this writing, no Python package for Supabase specifically — only a JS/TS implementation. This fills that gap for Python agents.

Why a dedicated Supabase saver, and not just langgraph-checkpoint-postgres?

Supabase is Postgres, so if you have direct DB access, the official Postgres checkpointer works fine and is the more battle-tested choice.

This package is for the common Supabase deployment shape where you don't have a direct psycopg connection available or convenient — serverless / edge functions, connection-pooler-constrained environments, or apps that already authenticate through Supabase's client libraries and RLS policies rather than raw SQL. It talks to Postgres exclusively over PostgREST, so it works anywhere supabase-py does.

Install

pip install langgraph-checkpoint-supabase

Setup

Run sql/schema.sql once against your Supabase project (SQL editor, or as a migration) to create the two tables this saver uses.

Usage

Sync

from langgraph_checkpoint_supabase import SupabaseSaver

checkpointer = SupabaseSaver.from_conn_info(
    url="https://<project>.supabase.co",
    key="<service-role-key>",  # or an RLS-scoped key — see below
)

graph = builder.compile(checkpointer=checkpointer)
config = {"configurable": {"thread_id": "1"}}
graph.invoke(inputs, config)

Async

from langgraph_checkpoint_supabase.aio import AsyncSupabaseSaver

checkpointer = await AsyncSupabaseSaver.from_conn_info(
    url="https://<project>.supabase.co",
    key="<service-role-key>",
)

graph = builder.compile(checkpointer=checkpointer)
config = {"configurable": {"thread_id": "1"}}
await graph.ainvoke(inputs, config)

Multi-tenant apps / Row Level Security

sql/schema.sql ships with commented-out RLS policies that scope rows to auth.uid(). Uncomment and adapt them if you're passing a user-scoped (anon/authenticated) key instead of the service-role key — this keeps one user's threads invisible to another's queries at the database level, not just in application code.

What's implemented

• put, put_writes, get_tuple, list, delete_thread, copy_thread, delete_for_runs (+ async equivalents) — the full set required for a working checkpointer, plus thread duplication and run-scoped cleanup.
• list(..., filter=...) uses Postgres jsonb containment (@>) against the metadata column.
• delete_for_runs matches checkpoints via metadata->>run_id, so it only finds checkpoints whose CheckpointMetadata includes a run_id (set by LangGraph on checkpoints written during a run).
• copy_thread duplicates every checkpoint and write row for a thread under a new thread_id, across all checkpoint_ns values — i.e. the complete parent chain, not just the latest checkpoint.
• Special write channels (errors, interrupts, scheduled tasks, resume values) are upsertable; regular writes are insert-once, matching the semantics of the official checkpointers.

What's not (yet) implemented

• prune — a newer optional BaseCheckpointSaver method not required for normal graph execution. Contributions welcome.
• Large-blob offload to Supabase Storage (the JS package's approach for very large states). The current schema stores the full checkpoint as jsonb, which is simpler and fine for typical agent state sizes, but isn't ideal for huge payloads.
• DeltaChannel reconstruction (a newer, Postgres-checkpointer-specific optimization) — out of scope for an initial version.

Testing

pip install -e ".[dev]"
pytest tests/test_shared.py -v          # no network required

# optional: full read/write test against a real project
export SUPABASE_TEST_URL="https://<project>.supabase.co"
export SUPABASE_TEST_KEY="<service-role-key>"
pytest tests/test_live_integration.py -v

License

MIT