代码优化2

lib/utils/book/book_dao.dart

@@ -174,6 +174,9 @@ class BookDao {
   // 彻底删除书籍
   Future<int> permanentDeleteBook(String id) => _wrap('permanentDeleteBook', () async {
     final db = await _dbHelper.database;
+    // 清理子记录，防止孤儿数据
+    await db.delete('book_reviews', where: 'book_id = ?', whereArgs: [id]);
+    await db.delete('book_excerpts', where: 'book_id = ?', whereArgs: [id]);
     return await db.delete(
       'books',
       where: 'id = ?',

lib/utils/book/book_excerpt_dao.dart

@@ -67,7 +67,7 @@ class BookExcerptDao {
     final db = await _dbHelper.database;
     await db.update(
       'book_excerpts',
-      {'is_deleted': 1},
+      {'is_deleted': 1, 'updated_at': DateTime.now().toUtc().toIso8601String()},
       where: 'id = ?',
       whereArgs: [id],
     );

lib/utils/book/book_review_dao.dart

@@ -67,7 +67,7 @@ class BookReviewDao {
     final db = await _dbHelper.database;
     await db.update(
       'book_reviews',
-      {'is_deleted': 1},
+      {'is_deleted': 1, 'updated_at': DateTime.now().toUtc().toIso8601String()},
       where: 'id = ?',
       whereArgs: [id],
     );