Adding sub-parts

app/models/__init__.py

@@ -7,6 +7,7 @@ from app.models.manufacturer import Manufacturer
 from app.models.part_type import PartType
 from app.models.permission import Permission
 from app.models.scope_model import ScopeModel
+from app.models.sub_part_type import SubPartType
 from app.models.refresh_token import RefreshToken
 from app.models.role import Role
 from app.models.unc_thread import UncThread
@@ -19,6 +20,7 @@ __all__ = [
     "PartType",
     "Permission",
     "ScopeModel",
+    "SubPartType",
     "RefreshToken",
     "Role",
     "UncThread",

app/models/sub_part_type.py

@@ -0,0 +1,18 @@
+from sqlalchemy import ForeignKey, UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+from app.models.part_type import PartType
+
+
+class SubPartType(Base):
+    __tablename__ = "sub_part_types"
+    __table_args__ = (UniqueConstraint("name", "part_type_id"),)
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    name: Mapped[str] = mapped_column(nullable=False)
+    part_type_id: Mapped[int] = mapped_column(
+        ForeignKey("part_types.id", ondelete="RESTRICT"), nullable=False
+    )
+
+    part_type: Mapped[PartType] = relationship(lazy="selectin")