f/overrides/event-backup/bip-dividend.csv
Greg Pomerantz bb8e39605e Event-history protection: backup dir, empty-download fallback, docs
Yahoo's 2026 event-feed change (capitalGain events dropped for some
funds; no events at all for terminated tickers) can wipe good event
history on re-download. Defense in depth:

- overrides/event-backup/: last-known-good copy of every dividend/
  capitalGain file (8,192 files, 58 MB); refresh with
  scripts/backup_events.py after each dump update
- data.py event_file(): frozen > data-root (while populated) > backup;
  used by panel reads, verify_official, and the double-listing scanner
- README: capital-gain files are mutual-fund-only in this dump; Yahoo
  has no LT/ST split (tax.py taxes capg at lt_rate; the per-fund split
  would come from fund-company annual tax statements or commercial feeds)
- tests: exact Timestamp .loc keys (pandas 3.x string matching returns a
  Series on large DatetimeIndex)
2026-08-31 21:59:25 -04:00

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Date,Dividends
2021-11-29,0.340000
2024-02-28,0.405000
2009-02-25,0.105159
2017-11-29,0.258929
2019-08-29,0.298810
2019-02-27,0.298810
2019-05-30,0.298810
2023-05-30,0.383000
2010-05-26,0.109127
2012-02-27,0.148810
2012-08-29,0.148810
2024-08-30,0.405000
2014-05-28,0.190476
2016-02-25,0.226190
2016-11-28,0.232143
2023-08-30,0.383000
2023-11-29,0.383000
2009-11-25,0.105159
2013-11-26,0.170635
2017-08-29,0.258929
2010-08-27,0.109127
2016-05-26,0.226190
2020-05-28,0.323333
2020-11-27,0.323333
2010-11-26,0.109127
2011-02-24,0.123016
2014-11-25,0.190476
2013-05-29,0.170635
2018-11-29,0.279762
2010-02-24,0.109127
2011-05-26,0.123016
2020-08-28,0.323333
2022-11-29,0.360000
2025-08-29,0.430000
2021-02-25,0.340000
2014-02-26,0.190476
2017-02-24,0.258929
2018-05-30,0.279762
2024-11-29,0.405000
2017-05-26,0.258929
2020-02-27,0.320238
2021-05-27,0.340000
2015-11-25,0.210317
2018-08-30,0.279762
2021-08-30,0.340000
2025-05-30,0.430000
2008-05-28,0.105159
2009-05-27,0.105159
2009-08-27,0.105159
2022-02-25,0.360000
2024-05-31,0.405000
2011-08-29,0.138889
2011-11-28,0.138889
2013-08-28,0.170635
2016-08-29,0.234127
2019-11-27,0.298810
2008-02-27,0.034921
2008-08-27,0.105159
2013-02-26,0.170635
2015-08-27,0.210317
2018-02-27,0.279762
2022-05-27,0.360000
2023-02-27,0.383000
2026-02-27,0.455000
2008-11-25,0.105159
2012-05-29,0.148810
2014-08-27,0.190476
2022-08-30,0.360000
2025-02-28,0.430000
2026-05-29,0.455000
2012-11-28,0.148810
2015-02-25,0.210317
2015-05-27,0.210317