Flat listing has no upload dates, so channels showed one 'All Videos' season.
Now real year-seasons, filled from cheap sources and cached so they grow:
- core: parse_rss_dates / channel_recent_dates — one public RSS GET dates the
~15 most-recent uploads (no yt-dlp, no bot risk).
- db: youtube_video_dates cache table + cache_video_dates / get_video_dates.
- /youtube/channel merges cached + RSS dates onto the flat videos (year-seasons)
and caches what it learns; /youtube/video caches each fetched date too — so
expanding/wishing videos progressively fills the catalog's years, instant on
repeat. Dateless tail groups as 'Earlier videos'. Missing-only toggle hidden
for channels. 84 db + 84 youtube/api tests green.
Full day-one coverage still needs the YouTube Data API's publishedAt (optional,
yt-dlp can't match it cheaply) — RSS + cache is the no-key best.
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