# Quality Guidelines

> Code quality standards for backend development.

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## Overview

<!--
Document your project's quality standards here.

Questions to answer:
- What patterns are forbidden?
- What linting rules do you enforce?
- What are your testing requirements?
- What code review standards apply?
-->

(To be filled by the team)

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## Forbidden Patterns

<!-- Patterns that should never be used and why -->

(To be filled by the team)

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## Required Patterns

<!-- Patterns that must always be used -->

### 部分 JSON 预览

- 从大会话文件的头部/尾部预览提取元数据时，必须识别 JSON 顶层结构；禁止用“第一个同名键”的正则结果代表顶层字段。
- 头部和尾部片段必须独立解析，禁止直接拼接后匹配，避免截断边界组合出文件中不存在的键值。
- 预览读取必须保持明确的字节上限；解析失败时按字段缺失安全降级，不能让单个损坏会话中断整个列表。

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## Testing Requirements

<!-- What level of testing is expected -->

- 部分 JSON 解析改动必须使用超过完整解析阈值的真实文件夹具，证明测试确实进入预览分支。
- 回归至少覆盖：嵌套同名键早于顶层键、顶层键位于尾部、字符串伪键与转义、`null`、字段跨截断边界、头尾拼接伪命中。

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## Code Review Checklist

<!-- What reviewers should check -->

(To be filled by the team)