adding part colour

app/models/part_colour.py

@@ -0,0 +1,12 @@
+from sqlalchemy import UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.database import Base
+
+
+class PartColour(Base):
+    __tablename__ = "part_colours"
+    __table_args__ = (UniqueConstraint("name"),)
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    name: Mapped[str] = mapped_column(nullable=False)