include time restriction

app/models.py

@@ -25,18 +25,21 @@ class PeriodEnum(str, Enum):
     twoyears = "1 - 2 Jahre"
     longterm = "mehr als zwei Jahre"
 
+
 class RegistrationBase(SQLModel):
-    email: EmailStr = Field(unique=True, index=True, max_length=255)
+    email: EmailStr = Field(max_length=255)
     first_name: str
     last_name: str
     birthday: date
     voice: VoiceEnum
     duration: PeriodEnum
-    
+    number_of_attempts: int
+
+
 class RegistrationCreate(RegistrationBase):
     pass
 
+
 class Registration(RegistrationBase, table=True):
     id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
     timestamp: datetime = Field(default_factory=func.now)
-