feat: house price prediction model integration

backend/app/models/house.py

@@ -1,6 +1,11 @@
+from typing import Optional, TYPE_CHECKING  
 from uuid import UUID, uuid4
 
-from sqlmodel import Field, SQLModel
+from sqlmodel import Field, Relationship, SQLModel
+
+if TYPE_CHECKING:
+    from backend.app.models.owner import Owner
+
 
 
 class House(SQLModel, table=True):
@@ -14,3 +19,4 @@ class House(SQLModel, table=True):
     square_feet: float = Field()
     bedrooms: int = Field()
     bathrooms: float = Field()
+    owner: Optional["Owner"] = Relationship(back_populates="houses")

backend/app/models/owner.py

@@ -1,8 +1,17 @@
+from typing import Optional, TYPE_CHECKING
 from uuid import UUID, uuid4
 
-from sqlmodel import Field, SQLModel
+from sqlmodel import Field, Relationship, SQLModel
+
+if TYPE_CHECKING:
+    from backend.app.models.house import House
+    from backend.app.models.user import User
 
 
 class Owner(SQLModel, table=True):
     id: UUID = Field(default_factory=uuid4, primary_key=True)
     user_id: UUID = Field(foreign_key="user.id", unique=True)
+    
+    # Relationship
+    houses: list["House"] = Relationship(back_populates="owner")
+    user: Optional["User"] = Relationship(back_populates="owner")

backend/app/models/user.py

@@ -1,9 +1,16 @@
+from typing import Optional, TYPE_CHECKING
 from uuid import UUID, uuid4
 
-from sqlmodel import Field, SQLModel
+from sqlmodel import Field, Relationship, SQLModel
+
+if TYPE_CHECKING:
+    from backend.app.models.owner import Owner
 
 
 class User(SQLModel, table=True):
     id: UUID = Field(default_factory=lambda: uuid4(), primary_key=True)
     email: str = Field(unique=True, nullable=False)
     password_hash: str = Field(nullable=False)
+
+    # Relationships
+    owner: Optional["Owner"] = Relationship(back_populates="user")