f/overrides/event-backup/cseix-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
2010-06-30,0.046000
2020-12-10,0.196000
2004-12-23,0.440000
2014-12-11,0.774000
2015-09-30,0.067000
2015-12-10,0.426000
2016-09-30,0.078000
2026-03-31,0.109000
1998-03-24,0.170000
2013-06-28,0.077000
2024-06-28,0.119000
2025-06-30,0.148000
2011-03-31,0.045000
2008-03-31,0.092000
2012-12-13,0.075000
2025-09-30,0.112000
2009-03-31,0.079000
2011-06-30,0.034000
2017-09-29,0.087000
2023-12-07,0.130000
2000-06-23,0.170000
2008-09-30,0.097000
2014-06-30,0.290000
2018-12-06,0.116000
2020-03-31,0.097000
2004-06-18,0.190000
2005-06-24,0.190000
2016-06-30,0.289000
2024-09-30,0.094000
2003-09-19,0.190000
2009-09-30,0.060000
2016-12-08,0.383000
2023-06-30,0.118000
1997-12-23,0.220000
2017-03-31,0.098000
1999-09-24,0.170000
2018-03-29,0.088000
2008-12-19,0.089000
2001-09-21,0.190000
2019-11-05,0.385000
2020-06-30,0.466000
2025-12-08,0.242000
1998-06-24,0.170000
2001-03-22,0.170000
2003-06-20,0.190000
2011-09-30,0.051000
1998-09-24,0.017000
2013-03-28,0.063000
2021-06-30,0.066000
2022-12-08,0.467000
2025-03-31,0.102000
1999-06-24,0.170000
2001-12-21,0.190000
2002-09-20,0.190000
2005-12-23,2.522000
2007-09-28,0.150000
2009-12-17,0.063000
2012-06-29,0.056000
2021-09-30,0.076000
1999-03-24,0.170000
2026-06-30,0.124000
2022-06-30,0.455000
2008-06-30,0.101000
2016-03-31,0.077000
2019-06-28,0.559000
2019-12-18,0.100000
2022-09-30,0.120000
2024-03-28,0.100000
2007-06-29,0.150000
2014-09-30,0.074000
2004-09-17,0.190000
2009-06-30,0.055000
2006-03-24,0.190000
2019-09-30,0.095000
2020-09-30,0.081000
2021-12-09,0.737000
2004-03-19,0.190000
2010-03-31,0.058000
2014-03-31,0.084000
2002-03-22,0.190000
2006-06-23,0.190000
2013-09-30,0.065000
2018-06-29,0.115000
2001-06-21,0.190000
2006-12-22,2.317000
2017-12-06,0.085000
2005-09-27,0.190000
2015-06-30,2.624000
2021-03-31,0.068000
2011-12-15,0.074000
2006-09-28,0.190000
2010-09-30,0.053000
2012-09-28,0.058000
1999-12-16,0.210000
2007-03-30,0.150000
2019-03-29,0.119000
2003-12-18,0.160000
2005-03-18,0.190000
2015-03-31,0.066000
2023-09-29,0.099000
2003-12-23,0.240000
2018-09-28,0.161000
2012-03-30,0.038000
2002-12-20,0.260000
2007-12-31,1.849000
2000-03-23,0.170000
2013-12-12,0.641000
2022-03-31,0.078000
2023-03-31,0.101000
2000-09-22,0.170000
2000-12-15,0.210000
2003-03-21,0.190000
2010-12-16,0.063000
2017-06-30,0.084000
2024-12-04,0.123000
1998-12-23,0.230000