f/overrides/event-backup/csrsx-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
2007-12-31,12.268000
2015-03-31,0.378000
2004-12-23,5.230000
2018-06-29,1.271000
1998-03-23,0.470000
1998-12-01,1.870000
2015-09-30,0.448000
1992-09-22,0.400000
2014-09-30,0.411000
2000-12-15,0.830000
2001-03-22,0.470000
2010-04-30,0.002000
2020-03-31,0.387000
2021-09-30,0.335000
1994-06-21,0.400000
1996-09-23,0.470000
2011-12-15,0.430000
1997-09-23,0.470000
2011-03-31,0.249000
2007-06-29,0.534000
2020-09-30,0.344000
2023-06-30,0.490000
2025-03-31,0.434000
1997-12-23,2.770000
2002-09-17,0.560000
2008-03-31,0.430000
2008-12-19,0.658000
2010-03-31,0.296000
2012-09-28,0.310000
2017-06-30,1.261000
2019-03-29,0.499000
1993-06-28,0.400000
2006-06-23,0.560000
2022-12-08,2.240000
2026-03-31,0.461000
2011-09-30,0.292000
2024-06-28,0.510000
1999-06-24,0.470000
2000-03-23,0.470000
1994-09-20,0.400000
2002-06-21,0.190000
2012-12-13,4.606000
2019-09-30,0.412000
1992-01-02,0.430000
1992-04-01,0.400000
2022-06-30,1.345000
2023-09-29,0.404000
2012-03-30,0.334000
2021-12-09,2.348000
2003-12-18,1.040000
2003-12-23,2.130000
2024-03-28,0.438000
1993-03-22,0.400000
1996-06-24,0.470000
2016-12-08,5.862000
1993-12-28,1.990000
2009-12-17,0.352000
2008-09-30,0.481000
2016-03-31,0.407000
2025-12-08,0.471000
2001-06-21,0.520000
2007-09-28,0.455000
1999-12-16,0.570000
2007-03-30,0.463000
2008-06-30,0.452000
2010-09-30,0.289000
1994-12-27,0.460000
2001-12-21,0.760000
2005-06-24,0.560000
2019-11-05,4.871000
2019-12-18,0.421000
2022-03-31,0.358000
1996-12-27,1.020000
2000-06-23,0.470000
2024-12-04,0.499000
2002-03-22,0.560000
2022-09-30,0.454000
2005-03-18,0.560000
2005-12-23,5.615000
2013-06-28,0.462000
2017-12-06,3.559000
2020-12-10,0.509000
1995-06-20,0.430000
1995-09-19,0.430000
2011-06-30,0.221000
2018-03-29,0.404000
2009-06-30,0.323000
2015-12-10,2.813000
2017-03-31,0.509000
1992-06-22,0.400000
1993-09-21,0.400000
1998-09-24,0.470000
2009-09-30,0.297000
2016-06-30,2.145000
2016-09-30,0.438000
2021-06-30,0.278000
1999-09-24,0.470000
2015-06-30,5.786000
2002-12-20,0.700000
2004-03-19,0.560000
2014-12-11,3.022000
1997-06-24,0.470000
2000-09-22,0.470000
2013-09-30,0.384000
2023-03-31,0.424000
1997-03-25,0.470000
2004-09-17,0.560000
2001-09-21,0.520000
2004-06-18,0.560000
2005-09-27,0.560000
2013-12-12,2.517000
2014-03-31,0.382000
2020-06-30,1.648000
1992-12-21,0.400000
1995-03-20,0.400000
2006-09-28,0.560000
2010-12-16,0.356000
2017-09-29,0.393000
1995-12-27,0.570000
2003-06-20,0.560000
2003-03-21,0.560000
2006-12-22,7.900000
2013-03-28,0.346000
2025-09-30,0.457000
2026-06-30,0.548000
1999-03-24,0.470000
2002-09-20,0.560000
2014-06-30,0.854000
2018-09-28,0.687000
2023-12-07,0.906000
2024-09-30,0.379000
1991-10-01,0.400000
2010-06-30,0.282000
1998-06-24,0.470000
2003-09-19,0.560000
2009-03-31,0.426000
2012-06-29,0.405000
1994-03-21,0.400000
1996-03-25,0.470000
2021-03-31,0.272000
2006-03-24,0.560000
2018-12-06,1.415000
2019-06-28,4.397000
2025-06-30,0.610000