feat: creating chats for cards and clients, sending and deleting text messages

models/card.py

@@ -12,8 +12,8 @@ from .shipping_warehouse import ShippingWarehouse
 if TYPE_CHECKING:
     from . import (
         CardBillRequest, User, BaseModel, Board, CardStatus, CardGroup, CardAttribute, Client, CardTag,
-        CardService as CardServiceModel, CardProduct,
-    )
+        CardService as CardServiceModel, CardProduct, Chat,
+)
 
 
 class Card(BaseModel):
@@ -114,6 +114,9 @@ class Card(BaseModel):
     # module employees
     employees: Mapped[list['CardEmployees']] = relationship(back_populates='card', lazy='selectin')
 
+    # module chat
+    chat: Mapped[Optional['Chat']] = relationship(back_populates='card', lazy='joined')
+
     # endregion