checkpointpostgres==2.0.17

langgraph-checkpoint-postgres 2.0.17

Summary of Changes

• Added TTL (Time To Live) support for Postgres store items (#3781)
• Implemented background sweeper for automatic cleanup of expired items (#3849)
• Added ability to refresh TTL when getting or searching items (#3849)
• Improved error handling in database migrations (#3849)

Detailed Changes

langgraph.store.postgres.base.PostgresStore

• Added ttl parameter to constructor to configure TTL behavior (#3781)
• Added sweep_ttl() method to manually delete expired items (#3849)
• Added start_ttl_sweeper() to begin background thread for automatic TTL cleanup (#3849)
• Added stop_ttl_sweeper() to properly shut down the background cleanup thread (#3849)
• Updated from_conn_string() to support TTL configuration (#3849)
• Modified database queries to handle TTL columns in PUT, GET, and SEARCH operations (#3849)
• Added cleanup logic in __del__ to ensure sweeper threads are stopped (#3849)

langgraph.store.postgres.aio.AsyncPostgresStore

• Added ttl parameter to constructor to configure TTL behavior (#3781)
• Added asynchronous sweep_ttl() method to manually delete expired items (#3849)
• Added start_ttl_sweeper() to begin background task for automatic TTL cleanup (#3849)
• Added stop_ttl_sweeper() to properly shut down the background cleanup task (#3849)
• Updated from_conn_string() to support TTL configuration (#3849)
• Added async context manager methods to ensure proper cleanup of resources (#3849)

langgraph.store.postgres.base.Migration

• Added new migrations to support TTL functionality (#3849):
  • Adding expires_at and ttl_minutes columns to store table
  • Creating index on expires_at for efficient TTL sweeping