f/overrides/event-backup/nseix-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
2009-05-01,0.091000
2025-10-23,0.091000
2005-07-28,0.085000
2019-05-08,0.741000
2017-12-28,0.917000
2024-10-24,0.100000
1993-12-30,0.013000
2001-04-26,0.034000
1995-07-21,0.081000
1998-12-30,0.453000
2009-07-30,0.072000
2023-12-27,0.122000
2006-12-28,0.094000
2014-12-30,0.408000
2024-05-09,0.454000
1995-04-28,0.075000
2000-10-26,0.070000
2004-10-28,0.058000
2009-11-03,0.091000
1997-10-24,0.104000
1998-05-01,0.139000
2006-05-05,0.080000
1999-04-30,0.046000
2004-07-26,0.050000
2013-05-02,0.228000
2016-11-03,0.092000
2020-12-30,0.674000
1995-12-28,0.093000
1998-07-31,0.094000
2018-05-09,1.174000
2019-12-30,1.627000
2026-04-27,0.072000
1996-12-30,0.286000
2000-12-27,0.050000
1994-07-29,0.078000
2003-05-05,0.033000
2007-05-07,0.513000
2022-12-28,0.094000
2002-10-30,0.051000
2006-10-31,0.097000
2015-05-06,0.582000
2021-10-27,0.091000
2010-12-30,0.124000
2012-11-02,0.083000
2007-12-27,1.683000
2022-10-26,0.097000
2001-07-26,0.040000
2003-12-30,0.047000
2008-11-04,0.097000
2011-11-03,0.106000
2013-11-06,0.076000
2013-12-30,0.796000
2016-08-04,0.100000
2017-05-10,0.398000
2004-12-30,0.059000
2007-10-30,0.090000
2017-11-02,0.010000
2023-08-02,0.109000
2012-07-27,0.092000
2019-10-30,0.081000
1995-10-20,0.088000
1996-07-19,0.103000
2001-10-25,0.037000
2008-08-01,0.105000
2008-12-29,0.115000
2019-08-07,0.070000
1994-10-21,0.065000
2000-07-31,0.078000
2005-10-31,0.079000
2009-12-30,0.062000
2001-12-27,0.059000
2002-12-26,0.053000
2014-10-30,0.120000
2018-10-31,0.104000
2025-05-08,0.853000
2005-05-03,0.339000
2011-12-29,0.450000
2006-07-27,0.095000
2016-05-05,0.481000
2018-08-02,0.104000
2018-12-28,1.573000
2020-05-07,0.133000
1997-05-01,0.396000
1997-12-30,0.535000
1999-12-29,0.217000
2010-07-29,0.076000
2025-08-07,0.111000
2004-04-30,0.046000
2012-05-10,0.125000
2008-05-05,0.102000
2010-05-05,0.042000
2014-05-07,0.561000
2003-10-30,0.038000
2005-12-29,0.307000
1998-10-23,0.126000
2007-07-27,0.086000
2015-10-29,0.105000
2016-12-28,0.085000
2021-05-12,1.211000
2023-10-25,0.108000
1994-12-29,0.093000
1996-04-26,0.136000
2025-12-29,0.579000
2012-12-27,0.524000
2015-08-05,0.109000
2020-08-05,0.081000
2020-10-28,0.089000
2024-12-27,0.209000
2003-07-25,0.032000
2010-10-28,0.065000
1996-10-18,0.117000
1999-10-28,0.098000
2021-12-30,1.173000
2022-08-03,0.093000
2026-07-27,0.132000
2002-07-24,0.045000
2015-12-30,0.525000
2022-05-11,0.497000
2011-07-28,0.096000
2014-08-06,0.088000
1999-07-29,0.100000
1994-04-29,0.045000
2011-05-03,0.365000
2021-08-04,0.086000
2023-05-10,0.538000
2024-08-08,0.109000
2013-08-07,0.113000
2017-08-03,0.086000