feat: residues accounting

models/residues.py

@@ -0,0 +1,62 @@
+import datetime
+from typing import TYPE_CHECKING, Optional
+
+from sqlalchemy import ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from models import BaseModel
+
+if TYPE_CHECKING:
+    from models import Product, Client
+
+
+class ResidualPallet(BaseModel):
+    __tablename__ = 'residual_pallets'
+    id: Mapped[int] = mapped_column(primary_key=True)
+    created_at: Mapped[datetime.datetime] = mapped_column(nullable=False)
+
+    client_id: Mapped[Optional[int]] = mapped_column(ForeignKey('clients.id'))
+    client: Mapped['Client'] = relationship(back_populates='pallets')
+
+    boxes: Mapped[list['ResidualBox']] = relationship(
+        back_populates='pallet',
+        uselist=True,
+        lazy='joined',
+        cascade='all, delete-orphan',
+    )
+
+    residual_products: Mapped[list['ResidualProduct']] = relationship(
+        back_populates='pallet',
+        uselist=True,
+        lazy='joined',
+        cascade='all, delete-orphan',
+    )
+
+
+class ResidualProduct(BaseModel):
+    __tablename__ = 'residual_products'
+    id: Mapped[int] = mapped_column(primary_key=True)
+    quantity: Mapped[int] = mapped_column()
+
+    product_id: Mapped[int] = mapped_column(ForeignKey('products.id'))
+    product: Mapped['Product'] = relationship(lazy='joined')
+
+    pallet_id: Mapped[Optional[int]] = mapped_column(ForeignKey('residual_pallets.id'))
+    pallet: Mapped[ResidualPallet] = relationship(lazy='joined', back_populates="residual_products")
+
+    box_id: Mapped[Optional[int]] = mapped_column(ForeignKey('residual_boxes.id'))
+    box: Mapped['ResidualBox'] = relationship(back_populates='residual_products')
+
+
+class ResidualBox(BaseModel):
+    __tablename__ = 'residual_boxes'
+    id: Mapped[int] = mapped_column(primary_key=True)
+    created_at: Mapped[datetime.datetime] = mapped_column(nullable=False)
+
+    pallet_id: Mapped[Optional[int]] = mapped_column(ForeignKey('residual_pallets.id'))
+    pallet: Mapped[ResidualPallet] = relationship(back_populates='boxes')
+
+    client_id: Mapped[Optional[int]] = mapped_column(ForeignKey('clients.id'))
+    client: Mapped['Client'] = relationship(back_populates='boxes')
+
+    residual_products: Mapped[list['ResidualProduct']] = relationship(back_populates='box')