v1.2 scaffold

backend/app/models/raw_material.py

@@ -0,0 +1,44 @@
+from __future__ import annotations
+
+from datetime import date, datetime
+
+from sqlalchemy import Date, DateTime, Float, ForeignKey, String, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.session import Base
+
+
+class RawMaterial(Base):
+    __tablename__ = "raw_materials"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    tenant_id: Mapped[str] = mapped_column(String(64), default="default")
+    name: Mapped[str] = mapped_column(String(255), unique=True, index=True)
+    supplier: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    unit_of_measure: Mapped[str] = mapped_column(String(64))
+    kg_per_unit: Mapped[float] = mapped_column(Float)
+    status: Mapped[str] = mapped_column(String(32), default="active")
+    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+
+    price_versions: Mapped[list["RawMaterialPriceVersion"]] = relationship(
+        back_populates="raw_material",
+        cascade="all, delete-orphan",
+        order_by="desc(RawMaterialPriceVersion.effective_date)",
+    )
+
+
+class RawMaterialPriceVersion(Base):
+    __tablename__ = "raw_material_price_versions"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    raw_material_id: Mapped[int] = mapped_column(ForeignKey("raw_materials.id"), index=True)
+    market_value: Mapped[float] = mapped_column(Float)
+    waste_percentage: Mapped[float] = mapped_column(Float, default=0.0)
+    effective_date: Mapped[date] = mapped_column(Date, default=date.today)
+    status: Mapped[str] = mapped_column(String(32), default="active")
+    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+
+    raw_material: Mapped[RawMaterial] = relationship(back_populates="price_versions")
+