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feat: implement image proxy for YouTube CDN images with caching to prevent rate limits

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Yusuf İpek
2025-10-11 20:34:25 +03:00
parent edd6c4416f
commit 7b43932fa6
7 changed files with 149 additions and 13 deletions
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memory-bank/systemPatterns.md
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- **Timezone Context Pattern**: React context provider (`TimezoneContext`) manages browser timezone detection and shares across components for consistent timestamp formatting.
- **Selection State Management**: Three-tier visual state system (active/selected, normal, previously-selected) with CSS class composition for clear user feedback.
- **Timestamp Resolution**: Backend uses `timestamp_usec` (microseconds) from YouTube data, converts to milliseconds, and frontend formats in user's local timezone.
- **Image Proxy Pattern**: Backend `/proxy/image` endpoint caches YouTube CDN images (avatars, badges, emojis) with MD5-hashed keys, 24hr TTL, and 1000-image LRU eviction. Returns stale cache on 429 errors or network failures. Frontend `proxyImageUrl()` helper transparently rewrites YouTube CDN URLs to use proxy.