pgvector

Postgres/PGVector vector store.

DEPRECATED: This class is pending deprecation and will likely receive no updates. An improved version of this class is available in langchain_postgres as PGVector. Please use that class instead.

When migrating please keep in mind that:
    * The new implementation works with psycopg3, not with psycopg2
      (This implementation does not work with psycopg3).
    * Filtering syntax has changed to use $ prefixed operators for JSONB
      metadata fields. (New implementation only uses JSONB field for metadata)
    * The new implementation made some schema changes to address issues
      with the existing implementation. So you will need to re-create
      your tables and re-index your data or else carry out a manual
      migration.

To use, you should have the pgvector python package installed.