Implement HTTP caching for file downloads with If-Modified-Since#140

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copilot/implement-if-modified-since-caching

Commits on Jan 23, 2026

Commits on Jan 24, 2026

Address PR feedback: fix queryOne, move headers, fix attachment_id, add immutable, add attachment test

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Use queryOneOrNone consistently in getThreadEmailAttachmentWithTimestamp

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Commits on Jan 25, 2026

Refactor: Extract attachment mapping to private helper method

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HNygard
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