diff --git a/backend/app/schemas/hours_payout.py b/backend/app/schemas/hours_payout.py
index ad14db2..862670c 100644
--- a/backend/app/schemas/hours_payout.py
+++ b/backend/app/schemas/hours_payout.py
@@ -18,13 +18,13 @@ class HoursPayoutOut(BaseModel):
     id: uuid.UUID
     company_id: uuid.UUID
     user_id: uuid.UUID
-    user_name: str          # Computed: first_name + last_name (wird im Router gesetzt)
+    user_name: str = ""          # Computed: first_name + last_name (wird im Router gesetzt)
     hours: Decimal
     period_year: int | None
     period_month: int | None
     note: str | None
     created_by: uuid.UUID
-    created_by_name: str    # Computed im Router
+    created_by_name: str = ""    # Computed im Router
     created_at: datetime