feat: полный patch External Channel архивирование creative в patch и

purchase, удалить у них доп ручки/usecase/dto

src/adapter/postgres.py

@@ -178,6 +178,11 @@ class Postgres(DatabaseBase):
         await self.session.execute(stmt)
         await self.session.flush()
 
+    async def update_external_channel(self, channel: domain.ExternalChannel) -> domain.ExternalChannel:
+        await self.session.flush()
+        await self.session.refresh(channel)
+        return channel
+
     async def get_creative(self, user_id: uuid.UUID, creative_id: uuid.UUID) -> domain.Creative | None:
         stmt = (
             select(domain.Creative)