feat: убираем денормализацию (антипреждевременная оптимизация)

src/usecase/__init__.py

@@ -230,6 +230,17 @@ class Database(typing.Protocol):
         self, subscriber_id: UUID, project_id: UUID
     ) -> domain.Subscription | None: ...
 
+    # Count methods
+    async def count_placements_by_creative(self, creative_id: UUID) -> int: ...
+
+    async def count_subscriptions_by_placement(self, placement_id: UUID) -> int: ...
+
+    async def count_placements_by_creative_batch(self, creative_ids: list[UUID]) -> dict[UUID, int]: ...
+
+    async def count_subscriptions_by_placement_batch(self, placement_ids: list[UUID]) -> dict[UUID, int]: ...
+
+    async def has_placements_for_creative(self, creative_id: UUID) -> bool: ...
+
     # Post methods
     async def create_post(self, post: domain.Post) -> None: ...