细节优化——1

backend/app/crud/comment.py

@@ -21,6 +21,7 @@ async def create_comment(
         entity_type=entity_type,
         entity_id=entity_id,
         content=comment_in.content,
+        quote_comment_id=comment_in.quote_comment_id,
         created_by=created_by,
     )
     db.add(comment)
@@ -46,3 +47,35 @@ async def list_comments(
         .order_by(Comment.created_at.asc())
     )
     return result.scalars().all()
+
+
+async def get_comment(db: AsyncSession, comment_id: uuid.UUID, *, include_deleted: bool = False) -> Comment | None:
+    stmt = select(Comment).where(Comment.id == comment_id)
+    if not include_deleted:
+        stmt = stmt.where(Comment.is_deleted.is_(False))
+    result = await db.execute(stmt)
+    return result.scalar_one_or_none()
+
+
+async def get_comments_by_ids(
+    db: AsyncSession,
+    ids: set[uuid.UUID],
+    *,
+    include_deleted: bool = False,
+) -> dict[uuid.UUID, Comment]:
+    if not ids:
+        return {}
+    stmt = select(Comment).where(Comment.id.in_(ids))
+    if not include_deleted:
+        stmt = stmt.where(Comment.is_deleted.is_(False))
+    result = await db.execute(stmt)
+    comments = result.scalars().all()
+    return {c.id: c for c in comments}
+
+
+async def soft_delete_comment(db: AsyncSession, comment: Comment) -> Comment:
+    comment.is_deleted = True
+    db.add(comment)
+    await db.commit()
+    await db.refresh(comment)
+    return comment