fix foreign keys

backend/app/models/house.py

@@ -8,4 +8,4 @@ class House(SQLModel, table=True):
     country: str = Field()
     price: float = Field()
     description: str = Field()
-    owner_id: UUID = Field(foreign_key="owner.id")
+    owner_user_id: UUID = Field(foreign_key="owner.user_id")

backend/app/models/owner.py

@@ -3,4 +3,4 @@ from uuid import uuid4, UUID
 
 class Owner(SQLModel, table=True):
     id: UUID = Field(default_factory=uuid4, primary_key=True)
-    user_id: UUID = Field(foreign_key="user.id")
+    user_id: UUID = Field(foreign_key="user.id", unique=True)