feat(stats) 统计忽略无数据情况

[coltea]

PR 标题

fix(stats) 统计忽略无数据情况

变更类型

请勾选适用的变更类型:

• Bug 修复 (不兼容变更的修复)
• 新功能 (不兼容变更的新功能)
• 功能改进 (不兼容现有功能的改进)
• 文档更新
• 依赖更新
• 重构 (不影响功能的代码修改)
• 测试用例
• CI/CD 配置变更
• 其他 (请描述):

变更内容

详细描述本次 PR 的具体变更内容:

1. feat(stats) 统计忽略无数据情况

测试情况

描述本次变更的测试情况:

• 已本地测试
• 已添加测试用例
• 不需要测试 (理由: )

其他说明

任何其他需要说明的事项:

[Copilot]

Pull request overview

This PR adds filtering to exclude empty/null values from statistics queries, preventing empty strings from being counted in hot referer hosts, browser names, and browser OS statistics.

Key Changes:

• Added SQL-level filtering for empty browser names and OS values in database queries
• Added runtime filtering for empty referer hosts, browser names, and OS values when merging aggregated hourly statistics
• Applied consistent empty string checks across both real-time and aggregated statistics data

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
backend/repo/pg/stat.go	Added SQL WHERE clauses to filter out empty referer_host, browser_name, and browser_os values in GetHotRefererHosts and GetHotBrowsers queries
backend/repo/pg/stat_hour.go	Added runtime checks to filter empty strings when merging referer host data, and SQL WHERE clauses for browser/OS queries, plus runtime checks when processing aggregated hourly statistics

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

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