added missing node def

cognee/modules/graph/models/Node.py

@@ -0,0 +1,59 @@
+from datetime import datetime, timezone
+from sqlalchemy import (
+    DateTime,
+    Index,
+    # event,
+    String,
+    JSON,
+    UUID,
+)
+
+# from sqlalchemy.schema import DDL
+from sqlalchemy.orm import Mapped, mapped_column
+
+from cognee.infrastructure.databases.relational import Base
+
+
+class Node(Base):
+    __tablename__ = "nodes"
+
+    id: Mapped[UUID] = mapped_column(UUID(as_uuid=True), primary_key=True)
+
+    slug: Mapped[UUID] = mapped_column(UUID(as_uuid=True), nullable=False)
+
+    user_id: Mapped[UUID] = mapped_column(UUID(as_uuid=True), nullable=False)
+
+    data_id: Mapped[UUID] = mapped_column(UUID(as_uuid=True), nullable=False)
+
+    dataset_id: Mapped[UUID] = mapped_column(UUID(as_uuid=True), index=True, nullable=False)
+
+    label: Mapped[str | None] = mapped_column(String(255))
+    type: Mapped[str] = mapped_column(String(255), nullable=False)
+    indexed_fields: Mapped[list] = mapped_column(JSON, nullable=False)
+
+    attributes: Mapped[dict | None] = mapped_column(JSON)
+
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), nullable=False
+    )
+
+    __table_args__ = (
+        Index("index_node_dataset_slug", "dataset_id", "slug"),
+        Index("index_node_dataset_data", "dataset_id", "data_id"),
+        # {"postgresql_partition_by": "HASH (user_id)"},  # HASH partitioning on user_id
+    )
+
+
+# Enable row-level security (RLS) for nodes
+# enable_node_rls = DDL("""
+#     ALTER TABLE nodes ENABLE ROW LEVEL SECURITY;
+# """)
+# create_user_isolation_policy = DDL("""
+#     CREATE POLICY user_isolation_policy
+#         ON nodes
+#         USING (user_id = current_setting('app.current_user_id')::uuid)
+#         WITH CHECK (user_id = current_setting('app.current_user_id')::uuid);
+# """)
+
+# event.listen(Node.__table__, "after_create", enable_node_rls)
+# event.listen(Node.__table__, "after_create", create_user_isolation_policy)