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## ADDED Requirements
### Requirement: 刷新接口双写
#### Scenario: 刷新接口双写成功
- **WHEN** 用户调用刷新接口更新行情数据
- **THEN** 系统先删除 Redis 缓存，再写入 MySQL，
#### Scenario: MySQL 写入失败
- **WHEN** 刷新接口写入 MySQL 失败
- **THEN** 系统返回错误响应，不更新 Redis 缓存，保证数据一致性
#### Scenario: Redis 写入失败
- **WHEN** 刷新接口写入 MySQL 成功但 Redis 写入失败
- **THEN** 系统返回成功响应（
### Requirement: 双写顺序保证
，
#### Scenario: 双写顺序
- **WHEN** 刷新接口执行双写
- **THEN** 系统先写入 MySQL 并确认成功，再更新 Redis 缓存
### Requirement: 缓存回填一致性
#### Scenario: 缓存未命中回填
- **WHEN** Redis 缓存未命中且从 MySQL 读取数据
- **THEN** 系统将 MySQL 数据回填到 Redis，
