v1.2 scaffold

backend/app/models/mix.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+from datetime import datetime
+
+from sqlalchemy import DateTime, Float, ForeignKey, String, Text, UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.session import Base
+
+
+class Mix(Base):
+    __tablename__ = "mixes"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    tenant_id: Mapped[str] = mapped_column(String(64), default="default")
+    client_name: Mapped[str] = mapped_column(String(255))
+    name: Mapped[str] = mapped_column(String(255), index=True)
+    status: Mapped[str] = mapped_column(String(32), default="draft")
+    version: Mapped[int] = mapped_column(default=1)
+    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+
+    ingredients: Mapped[list["MixIngredient"]] = relationship(
+        back_populates="mix",
+        cascade="all, delete-orphan",
+    )
+    products: Mapped[list["Product"]] = relationship(back_populates="mix")
+
+
+class MixIngredient(Base):
+    __tablename__ = "mix_ingredients"
+    __table_args__ = (UniqueConstraint("mix_id", "raw_material_id", name="uq_mix_ingredient"),)
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    mix_id: Mapped[int] = mapped_column(ForeignKey("mixes.id"), index=True)
+    raw_material_id: Mapped[int] = mapped_column(ForeignKey("raw_materials.id"), index=True)
+    quantity_kg: Mapped[float] = mapped_column(Float)
+    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
+
+    mix: Mapped[Mix] = relationship(back_populates="ingredients")
+    raw_material: Mapped["RawMaterial"] = relationship()
+
+
+from app.models.product import Product  # noqa: E402
+from app.models.raw_material import RawMaterial  # noqa: E402
+