feat: проверка существования канала при привязке

src/dto/creative.py

@@ -37,7 +37,6 @@ class GetCreativeInput(pydantic.BaseModel):
 class CreateCreativeInput(pydantic.BaseModel):
     name: str
     text: str
-    project_id: uuid.UUID
 
 
 class UpdateCreativeInput(pydantic.BaseModel):

src/dto/placement.py

@@ -22,9 +22,6 @@ class PlacementOutput(pydantic.BaseModel):
     invite_link: str
     status: domain.PlacementStatus
     subscriptions_count: int
-    views_count: int | None
-    views_availability: domain.PostViewsAvailability
-    last_views_fetch_at: datetime.datetime | None
     created_at: datetime.datetime
 
 

src/dto/purchase_plan.py

@@ -26,7 +26,7 @@ class GetPurchasePlanChannelsOutput(pydantic.BaseModel):
 
 
 class AttachChannelToPurchasePlanInput(pydantic.BaseModel):
-    username: str
+    username: str = pydantic.Field(pattern=r'^[^@]')
     status: PurchasePlanChannelStatus | None = None
     planned_cost: float | None = None
     comment: str | None = None