feat: deal group

models/deal.py

@@ -11,7 +11,7 @@ from .shipping_warehouse import ShippingWarehouse
 
 if TYPE_CHECKING:
     from . import (DealBillRequest, ServicePriceCategory,
-                   # DealGroup
+                   DealGroup
                    )
 
 
@@ -91,13 +91,12 @@ class Deal(BaseModel):
     category: Mapped[Optional["ServicePriceCategory"]] = relationship('ServicePriceCategory',
                                                                       secondary=DealPriceCategory.__table__,
                                                                       lazy='joined')
-    # group: Mapped[Optional["DealGroup"]] = relationship(
-    #     'DealGroup',
-    #     secondary='deal_relations',
-    #     lazy='joined',
-    #     uselist=False,
-    #     back_populates='deals'
-    # )
+    group: Mapped[Optional["DealGroup"]] = relationship(
+        'DealGroup',
+        secondary='deal_relations',
+        lazy='joined',
+        back_populates='deals'
+    )
 
 
 class DealStatusHistory(BaseModel):