feat: creatives and external channels

src/usecase/creative/get_creatives.py

@@ -0,0 +1,29 @@
+from typing import TYPE_CHECKING
+
+from src import dto
+
+if TYPE_CHECKING:
+    from .. import Usecase
+
+
+async def get_creatives(self: 'Usecase', input: dto.GetCreativesInput) -> dto.GetCreativesOutput:
+    async with self.database.transaction():
+        creatives = await self.database.get_user_creatives(
+            input.user_id, target_channel_id=input.target_channel_id, include_archived=input.include_archived
+        )
+
+    return dto.GetCreativesOutput(
+        creatives=[
+            dto.CreativeOutput(
+                id=creative.id,
+                name=creative.name,
+                text=creative.text,
+                target_channel_id=creative.target_channel_id,
+                target_channel_title=creative.target_channel.title,
+                created_at=creative.created_at,
+                status=creative.status,
+                purchases_count=creative.purchases_count,
+            )
+            for creative in creatives
+        ]
+    )