细节优化——1

backend/app/crud/milestone.py

@@ -1,7 +1,7 @@
 import uuid
 from typing import Sequence
 
-from sqlalchemy import select, update as sa_update
+from sqlalchemy import delete, select, update as sa_update
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.models.milestone import Milestone
@@ -47,3 +47,8 @@ async def update(db: AsyncSession, milestone: Milestone, milestone_in: Milestone
         await db.commit()
     await db.refresh(milestone)
     return milestone
+
+
+async def delete_milestone(db: AsyncSession, milestone: Milestone) -> None:
+    await db.execute(delete(Milestone).where(Milestone.id == milestone.id))
+    await db.commit()