feat: убираем денормализацию (антипреждевременная оптимизация)

src/usecase/creative/delete_creative.py

@@ -21,7 +21,8 @@ async def delete_creative(self: 'Usecase', input: dto.DeleteCreativeInput) -> No
 
     context.ensure_project_permission(domain.PermissionKey.PROJECTS_WRITE, creative.project_id)
 
-    if creative.placements_count > 0:
+    has_placements = await self.database.has_placements_for_creative(creative.id)
+    if has_placements:
         log.warning('Creative %s is used in placements and cannot be deleted', input.creative_id)
         raise domain.CreativeInUse(input.creative_id)