UpsertionRecord Class — langchain Architecture

Source Code

libs/langchain/langchain_classic/indexes/_sql_record_manager.py lines 53–82

class UpsertionRecord(Base):  # type: ignore[valid-type,misc]
    """Table used to keep track of when a key was last updated."""

    # ATTENTION:
    # Prior to modifying this table, please determine whether
    # we should create migrations for this table to make sure
    # users do not experience data loss.
    __tablename__ = "upsertion_record"

    uuid = Column(
        String,
        index=True,
        default=lambda: str(uuid.uuid4()),
        primary_key=True,
        nullable=False,
    )
    key = Column(String, index=True)
    # Using a non-normalized representation to handle `namespace` attribute.
    # If the need arises, this attribute can be pulled into a separate Collection
    # table at some time later.
    namespace = Column(String, index=True, nullable=False)
    group_id = Column(String, index=True, nullable=True)

    # The timestamp associated with the last record upsertion.
    updated_at = Column(Float, index=True)

    __table_args__ = (
        UniqueConstraint("key", "namespace", name="uix_key_namespace"),
        Index("ix_key_namespace", "key", "namespace"),
    )