316 lines
13 KiB
Python
316 lines
13 KiB
Python
"""
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SQLAlchemy models for the memory system.
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"""
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from dataclasses import dataclass
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from datetime import datetime
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from uuid import UUID as PyUUID
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@dataclass
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class RequestContext:
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"""
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Context for request authentication and authorization.
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This dataclass carries authentication data from HTTP requests to the
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memory engine operations. It can be extended to include additional
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context like headers, tokens, user info, etc.
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"""
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api_key: str | None = None
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api_key_id: str | None = None # UUID of the API key used for authentication
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tenant_id: str | None = None # Tenant identifier (set by extension after auth)
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internal: bool = False # True for background/internal operations (not user-visible)
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from pgvector.sqlalchemy import Vector
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from sqlalchemy import (
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CheckConstraint,
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Float,
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ForeignKey,
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ForeignKeyConstraint,
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Index,
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Integer,
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Text,
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func,
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)
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from sqlalchemy import (
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text as sql_text,
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)
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from sqlalchemy.dialects.postgresql import JSONB, TIMESTAMP, UUID
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from sqlalchemy.ext.asyncio import AsyncAttrs
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from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
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from .config import EMBEDDING_DIMENSION
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class Base(AsyncAttrs, DeclarativeBase):
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"""Base class for all models."""
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pass
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class Document(Base):
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"""Source documents for memory units."""
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__tablename__ = "documents"
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id: Mapped[str] = mapped_column(Text, primary_key=True)
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bank_id: Mapped[str] = mapped_column(Text, primary_key=True)
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original_text: Mapped[str | None] = mapped_column(Text)
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content_hash: Mapped[str | None] = mapped_column(Text)
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doc_metadata: Mapped[dict] = mapped_column("metadata", JSONB, server_default=sql_text("'{}'::jsonb"))
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created_at: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=func.now())
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updated_at: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=func.now())
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# Relationships
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memory_units = relationship("MemoryUnit", back_populates="document", cascade="all, delete-orphan")
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__table_args__ = (
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Index("idx_documents_bank_id", "bank_id"),
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Index("idx_documents_content_hash", "content_hash"),
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)
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class MemoryUnit(Base):
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"""Individual sentence-level memories."""
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__tablename__ = "memory_units"
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id: Mapped[PyUUID] = mapped_column(
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UUID(as_uuid=True), primary_key=True, server_default=sql_text("gen_random_uuid()")
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)
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bank_id: Mapped[str] = mapped_column(Text, nullable=False)
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document_id: Mapped[str | None] = mapped_column(Text)
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text: Mapped[str] = mapped_column(Text, nullable=False)
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embedding = mapped_column(Vector(EMBEDDING_DIMENSION)) # pgvector type
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context: Mapped[str | None] = mapped_column(Text)
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event_date: Mapped[datetime] = mapped_column(
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TIMESTAMP(timezone=True), nullable=False
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) # Kept for backward compatibility
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occurred_start: Mapped[datetime | None] = mapped_column(
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TIMESTAMP(timezone=True)
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) # When fact occurred (range start)
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occurred_end: Mapped[datetime | None] = mapped_column(TIMESTAMP(timezone=True)) # When fact occurred (range end)
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mentioned_at: Mapped[datetime | None] = mapped_column(TIMESTAMP(timezone=True)) # When fact was mentioned
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fact_type: Mapped[str] = mapped_column(Text, nullable=False, server_default="world")
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confidence_score: Mapped[float | None] = mapped_column(Float)
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access_count: Mapped[int] = mapped_column(Integer, server_default="0")
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unit_metadata: Mapped[dict] = mapped_column(
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"metadata", JSONB, server_default=sql_text("'{}'::jsonb")
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) # User-defined metadata (str->str)
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created_at: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=func.now())
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updated_at: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=func.now())
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# Relationships
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document = relationship("Document", back_populates="memory_units")
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unit_entities = relationship("UnitEntity", back_populates="memory_unit", cascade="all, delete-orphan")
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outgoing_links = relationship(
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"MemoryLink", foreign_keys="MemoryLink.from_unit_id", back_populates="from_unit", cascade="all, delete-orphan"
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)
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incoming_links = relationship(
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"MemoryLink", foreign_keys="MemoryLink.to_unit_id", back_populates="to_unit", cascade="all, delete-orphan"
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)
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__table_args__ = (
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ForeignKeyConstraint(
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["document_id", "bank_id"],
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["documents.id", "documents.bank_id"],
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name="memory_units_document_fkey",
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ondelete="CASCADE",
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),
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CheckConstraint("fact_type IN ('world', 'experience', 'opinion', 'observation')"),
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CheckConstraint("confidence_score IS NULL OR (confidence_score >= 0.0 AND confidence_score <= 1.0)"),
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CheckConstraint(
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"(fact_type = 'opinion' AND confidence_score IS NOT NULL) OR "
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"(fact_type = 'observation') OR "
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"(fact_type NOT IN ('opinion', 'observation') AND confidence_score IS NULL)",
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name="confidence_score_fact_type_check",
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),
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Index("idx_memory_units_bank_id", "bank_id"),
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Index("idx_memory_units_document_id", "document_id"),
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Index("idx_memory_units_event_date", "event_date", postgresql_ops={"event_date": "DESC"}),
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Index("idx_memory_units_bank_date", "bank_id", "event_date", postgresql_ops={"event_date": "DESC"}),
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Index("idx_memory_units_access_count", "access_count", postgresql_ops={"access_count": "DESC"}),
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Index("idx_memory_units_fact_type", "fact_type"),
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Index("idx_memory_units_bank_fact_type", "bank_id", "fact_type"),
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Index(
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"idx_memory_units_bank_type_date",
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"bank_id",
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"fact_type",
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"event_date",
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postgresql_ops={"event_date": "DESC"},
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),
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Index(
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"idx_memory_units_opinion_confidence",
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"bank_id",
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"confidence_score",
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postgresql_where=sql_text("fact_type = 'opinion'"),
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postgresql_ops={"confidence_score": "DESC"},
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),
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Index(
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"idx_memory_units_opinion_date",
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"bank_id",
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"event_date",
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postgresql_where=sql_text("fact_type = 'opinion'"),
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postgresql_ops={"event_date": "DESC"},
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),
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Index(
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"idx_memory_units_observation_date",
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"bank_id",
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"event_date",
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postgresql_where=sql_text("fact_type = 'observation'"),
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postgresql_ops={"event_date": "DESC"},
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),
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Index(
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"idx_memory_units_embedding",
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"embedding",
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postgresql_using="hnsw",
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postgresql_ops={"embedding": "vector_cosine_ops"},
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),
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)
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class Entity(Base):
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"""Resolved entities (people, organizations, locations, etc.)."""
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__tablename__ = "entities"
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id: Mapped[PyUUID] = mapped_column(
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UUID(as_uuid=True), primary_key=True, server_default=sql_text("gen_random_uuid()")
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)
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canonical_name: Mapped[str] = mapped_column(Text, nullable=False)
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bank_id: Mapped[str] = mapped_column(Text, nullable=False)
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entity_metadata: Mapped[dict] = mapped_column("metadata", JSONB, server_default=sql_text("'{}'::jsonb"))
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first_seen: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=func.now())
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last_seen: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=func.now())
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mention_count: Mapped[int] = mapped_column(Integer, server_default="1")
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# Relationships
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unit_entities = relationship("UnitEntity", back_populates="entity", cascade="all, delete-orphan")
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memory_links = relationship("MemoryLink", back_populates="entity", cascade="all, delete-orphan")
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cooccurrences_1 = relationship(
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"EntityCooccurrence",
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foreign_keys="EntityCooccurrence.entity_id_1",
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back_populates="entity_1",
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cascade="all, delete-orphan",
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)
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cooccurrences_2 = relationship(
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"EntityCooccurrence",
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foreign_keys="EntityCooccurrence.entity_id_2",
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back_populates="entity_2",
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cascade="all, delete-orphan",
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)
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__table_args__ = (
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Index("idx_entities_bank_id", "bank_id"),
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Index("idx_entities_canonical_name", "canonical_name"),
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Index("idx_entities_bank_name", "bank_id", "canonical_name"),
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)
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class UnitEntity(Base):
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"""Association between memory units and entities."""
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__tablename__ = "unit_entities"
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unit_id: Mapped[PyUUID] = mapped_column(
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UUID(as_uuid=True), ForeignKey("memory_units.id", ondelete="CASCADE"), primary_key=True
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)
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entity_id: Mapped[PyUUID] = mapped_column(
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UUID(as_uuid=True), ForeignKey("entities.id", ondelete="CASCADE"), primary_key=True
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)
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# Relationships
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memory_unit = relationship("MemoryUnit", back_populates="unit_entities")
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entity = relationship("Entity", back_populates="unit_entities")
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__table_args__ = (
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Index("idx_unit_entities_unit", "unit_id"),
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Index("idx_unit_entities_entity", "entity_id"),
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)
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class EntityCooccurrence(Base):
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"""Materialized cache of entity co-occurrences."""
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__tablename__ = "entity_cooccurrences"
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entity_id_1: Mapped[PyUUID] = mapped_column(
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UUID(as_uuid=True), ForeignKey("entities.id", ondelete="CASCADE"), primary_key=True
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)
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entity_id_2: Mapped[PyUUID] = mapped_column(
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UUID(as_uuid=True), ForeignKey("entities.id", ondelete="CASCADE"), primary_key=True
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)
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cooccurrence_count: Mapped[int] = mapped_column(Integer, server_default="1")
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last_cooccurred: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=func.now())
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# Relationships
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entity_1 = relationship("Entity", foreign_keys=[entity_id_1], back_populates="cooccurrences_1")
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entity_2 = relationship("Entity", foreign_keys=[entity_id_2], back_populates="cooccurrences_2")
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__table_args__ = (
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CheckConstraint("entity_id_1 < entity_id_2", name="entity_cooccurrence_order_check"),
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Index("idx_entity_cooccurrences_entity1", "entity_id_1"),
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Index("idx_entity_cooccurrences_entity2", "entity_id_2"),
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Index("idx_entity_cooccurrences_count", "cooccurrence_count", postgresql_ops={"cooccurrence_count": "DESC"}),
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)
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class MemoryLink(Base):
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"""Links between memory units (temporal, semantic, entity)."""
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__tablename__ = "memory_links"
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from_unit_id: Mapped[PyUUID] = mapped_column(
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UUID(as_uuid=True), ForeignKey("memory_units.id", ondelete="CASCADE"), primary_key=True
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)
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to_unit_id: Mapped[PyUUID] = mapped_column(
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UUID(as_uuid=True), ForeignKey("memory_units.id", ondelete="CASCADE"), primary_key=True
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)
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link_type: Mapped[str] = mapped_column(Text, primary_key=True)
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entity_id: Mapped[PyUUID | None] = mapped_column(
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UUID(as_uuid=True), ForeignKey("entities.id", ondelete="CASCADE"), primary_key=True
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)
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weight: Mapped[float] = mapped_column(Float, nullable=False, server_default="1.0")
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created_at: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=func.now())
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# Relationships
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from_unit = relationship("MemoryUnit", foreign_keys=[from_unit_id], back_populates="outgoing_links")
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to_unit = relationship("MemoryUnit", foreign_keys=[to_unit_id], back_populates="incoming_links")
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entity = relationship("Entity", back_populates="memory_links")
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__table_args__ = (
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CheckConstraint(
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"link_type IN ('temporal', 'semantic', 'entity', 'causes', 'caused_by', 'enables', 'prevents')",
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name="memory_links_link_type_check",
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),
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CheckConstraint("weight >= 0.0 AND weight <= 1.0", name="memory_links_weight_check"),
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Index("idx_memory_links_from", "from_unit_id"),
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Index("idx_memory_links_to", "to_unit_id"),
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Index("idx_memory_links_type", "link_type"),
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Index("idx_memory_links_entity", "entity_id", postgresql_where=sql_text("entity_id IS NOT NULL")),
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Index(
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"idx_memory_links_from_weight",
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"from_unit_id",
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"weight",
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postgresql_where=sql_text("weight >= 0.1"),
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postgresql_ops={"weight": "DESC"},
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),
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)
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class Bank(Base):
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"""Memory bank profiles with disposition traits and background."""
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__tablename__ = "banks"
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bank_id: Mapped[str] = mapped_column(Text, primary_key=True)
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disposition: Mapped[dict] = mapped_column(
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JSONB, nullable=False, server_default=sql_text('\'{"skepticism": 3, "literalism": 3, "empathy": 3}\'::jsonb')
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)
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background: Mapped[str] = mapped_column(Text, nullable=False, server_default="")
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created_at: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=func.now())
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updated_at: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=func.now())
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__table_args__ = (Index("idx_banks_bank_id", "bank_id"),)
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