tweaks

backend/app/models/product.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from datetime import datetime
 
-from sqlalchemy import Boolean, DateTime, Float, ForeignKey, Integer, String, Text
+from sqlalchemy import Boolean, DateTime, Float, ForeignKey, Integer, String, Text, UniqueConstraint
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.db.session import Base
@@ -29,6 +29,28 @@ class Product(Base):
     created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
 
     mix: Mapped["Mix"] = relationship(back_populates="products")
+    ingredients: Mapped[list["ProductIngredient"]] = relationship(
+        back_populates="product",
+        cascade="all, delete-orphan",
+        order_by="ProductIngredient.sort_order",
+    )
+
+
+class ProductIngredient(Base):
+    __tablename__ = "product_ingredients"
+    __table_args__ = (UniqueConstraint("product_id", "raw_material_id", name="uq_product_ingredient"),)
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    tenant_id: Mapped[str] = mapped_column(String(64), default="default", index=True)
+    product_id: Mapped[int] = mapped_column(ForeignKey("products.id"), index=True)
+    raw_material_id: Mapped[int] = mapped_column(ForeignKey("raw_materials.id"), index=True)
+    quantity_kg: Mapped[float] = mapped_column(Float)
+    sort_order: Mapped[int] = mapped_column(Integer, default=0)
+    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
+
+    product: Mapped[Product] = relationship(back_populates="ingredients")
+    raw_material: Mapped["RawMaterial"] = relationship()
 
 
 from app.models.mix import Mix  # noqa: E402
+from app.models.raw_material import RawMaterial  # noqa: E402