add contract storage fix various bugs and translations

backend/src/models.py

@@ -140,6 +140,10 @@ class Form(FormBase, table=True):
             "order_by": "Shipment.name"
         },
     )
+    contracts: list["Contract"] = Relationship(
+        back_populates="form",
+        cascade_delete=True
+    )
 
 class FormUpdate(SQLModel):
     name: str | None
@@ -168,20 +172,92 @@ class TemplateUpdate(SQLModel):
 class TemplateCreate(TemplateBase):
     pass
 
+class ChequeBase(SQLModel):
+    name: str
+    value: str
+
+class Cheque(ChequeBase, table=True):
+    id: int | None = Field(default=None, primary_key=True)
+    contract_id: int = Field(foreign_key="contract.id", ondelete="CASCADE")
+    contract: Optional["Contract"] = Relationship(
+        back_populates="cheques",
+    )
+
 class ContractBase(SQLModel):
+    firstname: str
+    lastname: str
+    email: str
+    phone: str
+    payment_method: str
+    cheque_quantity: int
+
+class Contract(ContractBase, table=True):
+    id: int | None = Field(default=None, primary_key=True)
+
+    form_id: int = Field(
+        foreign_key="form.id",
+        nullable=False,
+        ondelete="CASCADE"
+    )
+    products: list["ContractProduct"] = Relationship(
+        back_populates="contract",
+        cascade_delete=True
+    )
+    form: Optional[Form] = Relationship(back_populates="contracts")
+    cheques: list[Cheque] = Relationship(
+        back_populates="contract",
+        cascade_delete=True
+    )
+
+class ContractCreate(ContractBase):
+    products: list["ContractProductCreate"] = []
+    cheques: list["Cheque"] = []
     form_id: int
-    contract: dict
 
-class ContractPublic(ContractBase):
-    id: int
-
-# class Contract(ContractBase, table=True):
-#     id: int | None = Field(default=None, primary_key=True)
-    
 class ContractUpdate(SQLModel):
     pass
 
-class ContractCreate(ContractBase):
+class ContractPublic(ContractBase):
+    id: int
+    products: list["ContractProduct"] = []
+    form: Form
+
+class ContractProductBase(SQLModel):
+    product_id: int = Field(
+        foreign_key="product.id",
+        nullable=False,
+        ondelete="CASCADE"
+    )
+    shipment_id: int | None = Field(
+        default=None,
+        foreign_key="shipment.id",
+        nullable=True,
+        ondelete="CASCADE"
+    )
+    quantity: float
+
+class ContractProduct(ContractProductBase, table=True):
+    id: int | None = Field(default=None, primary_key=True)
+    contract_id: int = Field(
+        foreign_key="contract.id",
+        nullable=False,
+        ondelete="CASCADE"
+    )
+    contract: Optional["Contract"] = Relationship(back_populates="products")
+    product: Optional["Product"] = Relationship()
+    shipment: Optional["Shipment"] = Relationship()
+
+class ContractProductPublic(ContractProductBase):
+    id: int
+    quantity: float
+    contract: Contract
+    product: Product
+    shipment: Optional["Shipment"]
+
+class ContractProductCreate(ContractProductBase):
+    pass
+
+class ContractProductUpdate(ContractProductBase):
     pass
 
 class ShipmentBase(SQLModel):