Follow a channel → a background job fetches its FULL upload-date catalog so the
channel page's year-seasons populate fully, cached permanently (one-time per
channel, instant after).
- core/video/youtube.py: proxy_channel_dates() — no-key BULK dates via Piped/
Invidious instances (tries several, paginates); parse_proxy_dates handles both
shapes. The clean path the user wanted.
- core/video/youtube_enrichment.py: YoutubeDateEnricher daemon — enqueue(channel)
→ proxy bulk → cache; per-video yt-dlp only as a throttled fallback (cap 60,
0.4s) for wished videos when every proxy is down. Skips channels enriched in
the last 24h.
- db: youtube_channel_enrichment table + mark/check + wishlisted_video_ids_for_
channel. Enqueued from /youtube/follow and on opening a followed channel.
Scoped to FOLLOWED channels only (per request). 174 tests green; enricher imports
nothing from music.
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