Yijia-Xiao 2e38b47dca fix(dataflows): report windows a feed cannot observe as unavailable ...

- Yahoo news and the Reddit and StockTwits feeds serve only recent items, so a
  historical window trimmed to nothing was reported as "no news" or "no
  posts", and the sentiment analyst scored that silence as a neutral signal
- judge each empty window in one shared rule: it is a real absence only when
  the feed's coverage reaches the window's first day and the window ends by
  today; otherwise report it unavailable with where coverage starts
- coverage comes from the returned timestamps, which are newest-first on these
  feeds, plus Reddit's one-week search lookback; merged global-news searches
  prove no continuity and are bounded by the present alone
- state in the sentiment analyst that historical sentiment inputs are not
  guaranteed to be point-in-time

2026-09-14 22:07:41 +00:00

8.6 KiB

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