删除云图时自动同步图鉴：移除无云图的类型、替换首个云图引用，补充测试覆盖

app/routers/clouds.py

@@ -74,6 +74,54 @@ async def _get_cloud(db: DbSession, cloud_id: uuid.UUID) -> Cloud | None:
     return result.scalar_one_or_none()
 
 
+async def _sync_collections_after_cloud_removal(
+    db: DbSession,
+    user_id: uuid.UUID,
+    cloud_type_ids: set[int],
+) -> None:
+    """Keep collection entries aligned with the user's remaining typed clouds."""
+    if not cloud_type_ids:
+        return
+
+    result = await db.execute(
+        select(UserCollection).where(
+            UserCollection.user_id == user_id,
+            UserCollection.cloud_type_id.in_(cloud_type_ids),
+        )
+    )
+    collections_by_type = {
+        item.cloud_type_id: item for item in result.scalars().all()
+    }
+    removed_count = 0
+
+    for cloud_type_id in cloud_type_ids:
+        collection = collections_by_type.get(cloud_type_id)
+        if not collection:
+            continue
+
+        replacement_cloud_id = await db.scalar(
+            select(Cloud.id)
+            .where(
+                Cloud.user_id == user_id,
+                Cloud.cloud_type_id == cloud_type_id,
+            )
+            .order_by(Cloud.created_at.asc(), Cloud.id.asc())
+            .limit(1)
+        )
+        if replacement_cloud_id is None:
+            await db.delete(collection)
+            removed_count += 1
+        elif collection.first_cloud_id != replacement_cloud_id:
+            collection.first_cloud_id = replacement_cloud_id
+
+    if removed_count:
+        await db.execute(
+            update(User)
+            .where(User.id == user_id)
+            .values(collection_count=User.collection_count - removed_count)
+        )
+
+
 @router.get("", response_model=PageOut[CloudOut])
 async def list_gallery_clouds(
     db: DbSession,
@@ -335,9 +383,12 @@ async def delete_cloud(cloud_id: uuid.UUID, db: DbSession, user: CurrentUser) ->
     if cloud.user_id != user.id and user.role != "admin":
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="不能删除其他用户的图片")
     paths = [cloud.image_path, cloud.thumbnail_path]
+    cloud_type_ids = {cloud.cloud_type_id} if cloud.cloud_type_id is not None else set()
 
     was_public = cloud.status == "approved" and not cloud.is_hidden
     await db.delete(cloud)
+    await db.flush()
+    await _sync_collections_after_cloud_removal(db, cloud.user_id, cloud_type_ids)
 
     await db.execute(
         update(User)
@@ -370,9 +421,12 @@ async def batch_delete_clouds(
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="部分图片不存在或不属于当前用户")
 
     public_count = sum(1 for c in clouds if c.status == "approved" and not c.is_hidden)
+    cloud_type_ids = {c.cloud_type_id for c in clouds if c.cloud_type_id is not None}
     paths = [path for cloud in clouds for path in (cloud.image_path, cloud.thumbnail_path)]
     for cloud in clouds:
         await db.delete(cloud)
+    await db.flush()
+    await _sync_collections_after_cloud_removal(db, user.id, cloud_type_ids)
 
     await db.execute(
         update(User)