f/overrides/event-backup/iws-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
2023-09-26,0.582000
2003-03-07,0.088333
2003-12-16,0.121667
2006-12-20,0.328000
2009-03-24,0.184000
2011-03-24,0.200000
2015-09-25,0.277000
2023-03-23,0.491000
2005-12-22,0.288000
2009-07-02,0.208000
2007-06-28,0.270333
2016-07-06,0.418000
2016-09-26,0.300000
2001-10-01,0.122667
2020-06-15,0.359000
2026-03-17,0.451000
2009-09-22,0.133000
2012-06-26,0.237000
2012-12-19,0.385000
2014-03-25,0.298000
2019-03-20,0.392000
2021-03-25,0.383000
2021-12-13,0.513000
2021-06-10,0.302000
2002-03-08,0.083333
2004-09-24,0.157667
2010-09-23,0.271000
2011-09-23,0.187000
2015-03-25,0.293000
2019-06-17,0.438000
2020-12-14,0.436000
2022-09-26,0.606000
2018-12-17,0.475000
2004-12-23,0.175333
2005-03-24,0.200667
2012-09-24,0.220000
2015-12-24,0.500000
2016-12-22,0.573000
2018-03-22,0.371000
2018-07-03,0.496000
2022-03-24,0.453000
2023-12-20,0.587000
2025-09-16,0.563000
2003-09-12,0.108333
2013-09-24,0.205000
2014-12-24,0.470000
2002-12-13,0.143333
2005-06-20,0.142333
2013-07-02,0.312000
2016-03-23,0.398000
2017-03-24,0.366000
2022-12-13,0.582000
2025-12-16,0.656000
2022-06-09,0.390000
2002-09-13,0.100333
2003-06-13,0.129333
2008-09-24,0.212000
2010-03-24,0.150000
2011-07-05,0.246000
2017-07-06,0.438000
2020-09-23,0.426000
2020-03-25,0.589000
2003-12-12,0.160667
2004-06-25,0.124333
2006-03-24,0.187000
2014-07-02,0.358000
2015-07-02,0.400000
2017-09-26,0.441000
2019-09-24,0.479000
2024-09-25,0.586000
2002-06-14,0.109667
2006-06-22,0.182000
2013-03-25,0.208000
2021-09-24,0.506000
2023-06-07,0.385000
2005-09-23,0.179333
2006-09-26,0.198000
2009-12-23,0.249000
2011-12-22,0.287000
2019-12-16,0.553000
2007-12-27,0.342000
2008-03-24,0.114667
2010-12-22,0.276000
2013-12-23,0.399000
2014-09-24,0.235000
2017-12-21,0.501000
2001-12-14,0.122667
2008-07-02,0.261667
2008-12-23,0.289000
2012-03-23,0.209000
2024-06-11,0.389000
2024-12-17,0.580000
2025-06-16,0.492000
2004-03-26,0.119667
2007-03-23,0.248667
2007-09-25,0.215333
2010-07-02,0.181000
2018-09-26,0.587000
2024-03-21,0.385000
2025-03-18,0.448000
2026-06-15,0.504000