Yijia-Xiao 40774ca042 fix(dataflows): make the Yahoo news window UTC and end-exclusive ...

- the upper bound was inclusive, so an article stamped exactly midnight after
  end_date leaked into a historical run
- flat epoch timestamps were parsed in host-local time and offset-aware stamps had
  tzinfo stripped without converting, making filtering machine-dependent
- normalize every operand to UTC and use a half-open [start, end + 1 day) #1126

2026-07-18 06:28:38 +00:00

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