强化定时任务日志查询的错误处理

添加多层错误保护：

1. 在整个查询函数外层添加try-except
2. 在每行数据处理时也添加try-except
3. 出错时返回空数组而不是抛出异常
4. 打印详细的错误信息和堆栈跟踪

这样即使数据有问题，也不会导致500错误，
而是会正常返回空列表并在日志中显示具体错误。

位置: database.py 第1661-1695行

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

database.py

@@ -1660,27 +1660,39 @@ def update_schedule_execution_log(log_id, **kwargs):
 
 def get_schedule_execution_logs(schedule_id, limit=10):
     """获取定时任务执行日志"""
-    with db_pool.get_db() as conn:
-        cursor = conn.cursor()
-        cursor.execute('''
-            SELECT * FROM schedule_execution_logs
-            WHERE schedule_id = ?
-            ORDER BY execute_time DESC
-            LIMIT ?
-        ''', (schedule_id, limit))
+    try:
+        with db_pool.get_db() as conn:
+            cursor = conn.cursor()
+            cursor.execute('''
+                SELECT * FROM schedule_execution_logs
+                WHERE schedule_id = ?
+                ORDER BY execute_time DESC
+                LIMIT ?
+            ''', (schedule_id, limit))
 
-        # 将数据库字段映射到前端期望的字段名
-        logs = []
-        for row in cursor.fetchall():
-            log = dict(row)
-            # 字段映射
-            log['created_at'] = log.get('execute_time')
-            log['success_count'] = log.get('success_accounts', 0)
-            log['failed_count'] = log.get('failed_accounts', 0)
-            log['duration'] = log.get('duration_seconds', 0)
-            logs.append(log)
+            # 将数据库字段映射到前端期望的字段名
+            logs = []
+            rows = cursor.fetchall()
 
-        return logs
+            for row in rows:
+                try:
+                    log = dict(row)
+                    # 字段映射
+                    log['created_at'] = log.get('execute_time')
+                    log['success_count'] = log.get('success_accounts', 0)
+                    log['failed_count'] = log.get('failed_accounts', 0)
+                    log['duration'] = log.get('duration_seconds', 0)
+                    logs.append(log)
+                except Exception as e:
+                    print(f"[数据库] 处理日志行时出错: {e}")
+                    continue
+
+            return logs
+    except Exception as e:
+        print(f"[数据库] 查询定时任务日志时出错: {e}")
+        import traceback
+        traceback.print_exc()
+        return []  # 出错时返回空列表，而不是抛出异常
 
 
 def get_user_all_schedule_logs(user_id, limit=50):