langgraph langgraph-checkpoint-postgres==3.1.3

The checkpointpostgres 3.1.3 release includes critical fixes for delta history handling, particularly around empty checkpoint IDs and cursor derivation during delta walks. Performance improvements were made by optimizing the starting point of delta walks, and validation logic was strengthened for namespace labels. Type safety was enhanced by broadening the Store put method's value type to support more flexible data structures.