Mix calculator

backend/app/models/mix_calculator.py

@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+from datetime import date, datetime
+
+from sqlalchemy import Date, DateTime, Float, ForeignKey, Integer, String, Text, UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.session import Base
+
+
+class MixCalculatorSession(Base):
+    __tablename__ = "mix_calculator_sessions"
+    __table_args__ = (UniqueConstraint("tenant_id", "session_number", name="uq_mix_calculator_session_number"),)
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    tenant_id: Mapped[str] = mapped_column(String(64), default="default", index=True)
+    session_number: Mapped[str] = mapped_column(String(32), index=True)
+    client_name: Mapped[str] = mapped_column(String(255), index=True)
+    product_id: Mapped[int] = mapped_column(ForeignKey("products.id"), index=True)
+    product_name: Mapped[str] = mapped_column(String(255))
+    mix_id: Mapped[int] = mapped_column(ForeignKey("mixes.id"), index=True)
+    mix_name: Mapped[str] = mapped_column(String(255))
+    mix_date: Mapped[date] = mapped_column(Date, index=True)
+    batch_size_kg: Mapped[float] = mapped_column(Float)
+    total_bags: Mapped[float] = mapped_column(Float)
+    total_kg: Mapped[float] = mapped_column(Float)
+    product_unit_of_measure: Mapped[str] = mapped_column(String(64))
+    product_unit_size_kg: Mapped[float] = mapped_column(Float)
+    prepared_by_user_id: Mapped[int | None] = mapped_column(ForeignKey("client_users.id"), nullable=True, index=True)
+    prepared_by_name: Mapped[str] = mapped_column(String(255))
+    created_by: Mapped[str] = mapped_column(String(255))
+    status: Mapped[str] = mapped_column(String(32), default="saved")
+    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    lines: Mapped[list["MixCalculatorSessionLine"]] = relationship(
+        back_populates="session",
+        cascade="all, delete-orphan",
+        order_by="MixCalculatorSessionLine.sort_order",
+    )
+
+
+class MixCalculatorSessionLine(Base):
+    __tablename__ = "mix_calculator_session_lines"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    tenant_id: Mapped[str] = mapped_column(String(64), default="default", index=True)
+    session_id: Mapped[int] = mapped_column(ForeignKey("mix_calculator_sessions.id"), index=True)
+    raw_material_id: Mapped[int | None] = mapped_column(nullable=True)
+    raw_material_name: Mapped[str] = mapped_column(String(255))
+    required_kg: Mapped[float] = mapped_column(Float)
+    mix_percentage: Mapped[float] = mapped_column(Float)
+    unit: Mapped[str] = mapped_column(String(64))
+    sort_order: Mapped[int] = mapped_column(Integer, default=0)
+
+    session: Mapped[MixCalculatorSession] = relationship(back_populates="lines")