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@github-actions github-actions released this 03 Dec 01:59
checkpointpostgres==2.0.7
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langgraph-checkpoint-postgres 2.0.7

Summary of Changes

  • Improved vector search capabilities with more efficient namespace filtering and correct ordering for different distance types (PR #2594)
  • Added support for configurable vector indices (HNSW, IVFFlat, flat) with appropriate configuration options (PR #2598)
  • Enhanced migration handling in PostgresSaver to be more resilient when tables don't exist (PR #2600)

Detailed Changes

langgraph.store.postgres.base.Migration

  • Added a new condition field to allow conditional migrations based on store configuration (PR #2598)

langgraph.store.postgres.base.ANNIndexConfig

  • Added a kind field to specify the type of index to use: 'hnsw', 'ivfflat', or 'flat' (PR #2598)

langgraph.store.postgres.base.HNSWConfig

  • Added new configuration class for HNSW (Hierarchical Navigable Small World) indices with parameters for maximum connections per layer (m) and dynamic candidate list size (ef_construction) (PR #2598)

langgraph.store.postgres.base.IVFFlatConfig

  • Added new configuration class for IVFFlat indices with parameter for number of inverted lists/clusters (nlist) (PR #2598)

langgraph.store.postgres.base.BasePostgresStore

  • Improved vector search implementation with more efficient namespace filtering (PR #2594)
  • Added conditional migration execution based on store configuration (PR #2598)
  • Added automatic vector index creation based on configuration (PR #2598)

langgraph.store.postgres.base.get_distance_operator

  • Modified to return a tuple of SQL expressions instead of a single string, separating the operator used for ordering and the post-processing expression (PR #2594)
  • Improved compatibility with ascending/descending ordering and different distance types (l2, inner_product, cosine) (PR #2594)

langgraph.checkpoint.postgres.PostgresSaver

  • Enhanced migration handling to always create tables if they don't exist rather than catching exceptions (PR #2600)

langgraph.checkpoint.postgres.aio.AsyncPostgresSaver

  • Enhanced migration handling to always create tables if they don't exist rather than catching exceptions (PR #2600)
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