feat: setting manager for a deal

models/deal.py

@@ -10,9 +10,12 @@ from .marketplace import BaseMarketplace
 from .shipping_warehouse import ShippingWarehouse
 
 if TYPE_CHECKING:
-    from . import (DealBillRequest, ServicePriceCategory,
-                   DealGroup
-                   )
+    from . import (
+        DealBillRequest,
+        ServicePriceCategory,
+        DealGroup,
+        User,
+    )
 
 
 # @unique
@@ -98,6 +101,9 @@ class Deal(BaseModel):
         back_populates='deals'
     )
 
+    manager_id: Mapped[int] = mapped_column(ForeignKey('users.id'), nullable=True)
+    manager: Mapped[Optional["User"]] = relationship(back_populates='managed_deals', lazy='joined')
+
 
 class DealStatusHistory(BaseModel):
     __tablename__ = 'deals_status_history'