Adding Attachment Points

app/models/attachment_point.py

@@ -0,0 +1,42 @@
+from sqlalchemy import ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+from app.models.attachment_point_name import AttachmentPointName
+from app.models.clamp_connection import ClampConnection
+from app.models.iso_thread import IsoThread
+from app.models.static_connection import StaticConnection
+from app.models.unc_thread import UncThread
+
+
+class AttachmentPoint(Base):
+    __tablename__ = "attachment_points"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+
+    augmented_part_id: Mapped[int] = mapped_column(
+        ForeignKey("augmented_parts.id", ondelete="CASCADE"), nullable=False
+    )
+    attachment_point_name_id: Mapped[int] = mapped_column(
+        ForeignKey("attachment_point_names.id", ondelete="RESTRICT"), nullable=False
+    )
+
+    # Exactly one of the four below must be non-null (enforced in application layer)
+    iso_thread_id: Mapped[int | None] = mapped_column(
+        ForeignKey("iso_threads.id", ondelete="RESTRICT"), nullable=True, default=None
+    )
+    unc_thread_id: Mapped[int | None] = mapped_column(
+        ForeignKey("unc_threads.id", ondelete="RESTRICT"), nullable=True, default=None
+    )
+    clamp_connection_id: Mapped[int | None] = mapped_column(
+        ForeignKey("clamp_connections.id", ondelete="RESTRICT"), nullable=True, default=None
+    )
+    static_connection_id: Mapped[int | None] = mapped_column(
+        ForeignKey("static_connections.id", ondelete="RESTRICT"), nullable=True, default=None
+    )
+
+    attachment_point_name: Mapped[AttachmentPointName] = relationship(lazy="selectin")
+    iso_thread: Mapped[IsoThread | None] = relationship(lazy="selectin")
+    unc_thread: Mapped[UncThread | None] = relationship(lazy="selectin")
+    clamp_connection: Mapped[ClampConnection | None] = relationship(lazy="selectin")
+    static_connection: Mapped[StaticConnection | None] = relationship(lazy="selectin")