f/overrides/event-backup/iyk-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
2011-03-25,0.110667
2005-09-23,0.071333
2008-09-24,0.106000
2008-06-25,0.063333
2024-12-17,0.517000
2022-03-24,0.256667
2022-09-26,0.444000
2000-10-18,0.033000
2014-06-24,0.155333
2012-03-26,0.101333
2014-03-25,0.131333
2001-12-14,0.036667
2002-03-08,0.024000
2004-12-23,0.065667
2003-06-13,0.094000
2021-03-25,0.173333
2025-12-16,0.696000
2026-03-17,0.336000
2013-12-23,0.183667
2003-12-12,0.081000
2008-03-25,0.096667
2023-09-26,0.592333
2026-06-15,0.417000
2004-06-25,0.057333
2010-12-22,0.149667
2013-09-24,0.149333
2017-12-19,0.199000
2022-06-09,0.267667
2003-03-07,0.022333
2013-03-25,0.110667
2015-09-25,0.193333
2007-03-23,0.092000
2007-12-27,0.094333
2021-06-10,0.161333
2000-12-20,0.038667
2006-12-20,0.124667
2023-12-20,0.534000
2004-09-24,0.066000
2012-12-19,0.179667
2014-09-24,0.172333
2016-09-26,0.230333
2020-06-15,0.148000
2001-06-08,0.042000
2005-12-22,0.080667
2009-12-23,0.138667
2011-09-23,0.097000
2025-06-16,0.407000
2004-03-26,0.053333
2012-09-25,0.149000
2009-06-24,0.109000
2010-09-23,0.094000
2005-06-20,0.070000
2017-09-26,0.164000
2019-06-17,0.287667
2000-07-19,0.012000
2003-09-12,0.026333
2005-03-24,0.065000
2024-06-11,0.403000
2017-06-27,0.173667
2019-03-20,0.179667
2007-06-28,0.118667
2008-12-23,0.119000
2009-03-25,0.108333
2017-03-24,0.197333
2025-09-16,0.448000
2002-12-13,0.091000
2018-12-17,0.230667
2015-06-24,0.191333
2016-12-21,0.325333
2024-03-21,0.286000
2010-03-25,0.100333
2002-06-14,0.036333
2006-06-22,0.089000
2018-09-26,0.280333
2018-03-22,0.202000
2001-03-09,0.019667
2001-10-01,0.075667
2012-06-19,0.129000
2015-03-25,0.151000
2022-12-13,0.493000
2021-12-13,0.393667
2023-06-07,0.338333
2019-12-16,0.280333
2021-09-24,0.264667
2015-12-24,0.228000
2016-06-21,0.219333
2020-09-23,0.261333
2009-09-22,0.090333
2010-06-24,0.118333
2020-12-14,0.216000
2024-09-25,0.516000
2019-09-24,0.233333
2020-03-25,0.195333
2023-03-23,0.289333
2025-03-18,0.288000
2014-12-24,0.178000
2018-06-26,0.284667
2011-06-24,0.113333
2011-12-22,0.160000
2002-09-13,0.050333
2003-12-16,0.056000
2006-03-24,0.078000
2016-03-23,0.194667
2007-09-25,0.091000
2013-06-26,0.143667
2006-09-26,0.083333