build: up version

Author: scream4ik

CHANGELOG.md

@@ -5,6 +5,17 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.5.1] - 2025-12-29
+
+### Fixed
+- **LangGraph Subgraph Support:** Previously, `MemStateCheckpointer` ignored the `checkpoint_ns` (namespace) parameter. This caused state collisions when using nested graphs (subgraphs) within the same thread. Now, checkpoints are strictly isolated by both `thread_id` and `checkpoint_ns`.
+
+### Performance
+- **New Indexes:** Added functional indexes for `payload.checkpoint_ns` in both **PostgreSQL** (B-Tree on JSONB path) and **SQLite**. This ensures fast state retrieval for complex agent workflows without full table scans.
+
+### Changed
+- **Checkpointer Logic:** Updated `put` and `aput` methods in LangGraph integrations to explicitly persist the `checkpoint_ns` field within the fact payload.
+
 ## [0.5.0] - 2025-12-23
 
 ### Major Feature: Hybrid Structured-Semantic Search

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "memstate"
-version = "0.5.0"
+version = "0.5.1"
 description = "Transactional Memory for AI Agents - Keep SQL and Vector DBs in sync with ACID-like guarantees"
 readme = "README.md"
 requires-python = ">=3.10"