diff --git a/Makefile b/Makefile
index c048a1e..23bf884 100644
--- a/Makefile
+++ b/Makefile
@@ -16,10 +16,6 @@ start:
 	docker compose down -v db
 	docker compose up --build
 
-clean-db:
-	docker compose down
-	docker compose down -v db
-
 clean:
 	rm -rf $(VENV_DIR)
 
diff --git a/backend/app/dtos/house_create_request.py b/backend/app/dtos/house_create_request.py
index fff068b..18a2ca7 100644
--- a/backend/app/dtos/house_create_request.py
+++ b/backend/app/dtos/house_create_request.py
@@ -1,9 +1,9 @@
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 
 class HouseCreateRequest(BaseModel):
-    address: str
-    city: str
-    country: str
-    price: float
-    description: str
+    address: str = Field(..., min_length=1, max_length=255, description="House address", examples=["123 Main St"])
+    city: str = Field(..., description="City where the house is located", examples=["Springfield"])
+    country: str = Field(..., description="Country where the house is located", examples=["USA"])
+    price: float = Field(..., description="Price of the house", examples=[250000.00])
+    description: str = Field(..., description="Description of the house", examples=["A beautiful 3-bedroom house"])
 
diff --git a/backend/app/models/house.py b/backend/app/models/house.py
index bf8f57b..072b590 100644
--- a/backend/app/models/house.py
+++ b/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")
diff --git a/backend/app/models/owner.py b/backend/app/models/owner.py
index 4a192d3..f46a715 100644
--- a/backend/app/models/owner.py
+++ b/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)
diff --git a/backend/app/routers/houses.py b/backend/app/routers/houses.py
index 87ee24d..d21b44c 100644
--- a/backend/app/routers/houses.py
+++ b/backend/app/routers/houses.py
@@ -23,7 +23,7 @@ async def create_house(body: HouseCreateRequest, auth: Annotated[AuthContext, De
         await owner_repository.save(new_owner)
 
     house = House(
-        owner_id=auth.user.id,
+        owner_user_id=auth.user.id,
         address=body.address,
         city=body.city,
         country=body.country,