feat: get deals endpoint

models/board.py

@@ -7,7 +7,7 @@ from sqlalchemy.orm import Mapped, mapped_column, relationship
 from models.base import BaseModel
 
 if TYPE_CHECKING:
-    from models import Project, Status
+    from models import Project, Status, Deal
 
 
 class Board(BaseModel):
@@ -30,3 +30,8 @@ class Board(BaseModel):
         "Status",
         back_populates="board",
     )
+
+    deals: Mapped[list["Deal"]] = relationship(
+        "Deal",
+        back_populates="board",
+    )