f/overrides/event-backup/aivsx-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
2021-06-16,0.568000
2024-06-12,0.387000
2008-03-07,0.170000
2009-12-23,0.140000
2014-03-14,0.140000
2017-03-17,0.150000
1999-12-13,2.890000
2012-03-14,0.130000
2016-03-18,0.145000
2026-06-16,0.324000
1992-03-06,0.110000
2002-06-07,0.130000
1986-03-03,0.110000
1988-09-02,0.110000
1997-09-05,0.120000
2001-12-17,0.480000
1991-12-20,0.110000
1997-12-19,2.740000
2006-06-02,0.150000
2010-03-05,0.130000
2018-06-15,0.716000
2016-06-17,0.145000
1986-12-01,0.110000
1999-06-04,0.120000
2000-03-03,0.520000
2011-12-22,0.190000
2002-10-28,0.044000
2011-09-16,0.130000
2024-03-13,0.155000
1992-09-04,0.110000
2004-12-13,0.485000
2020-03-18,0.155000
2022-06-15,0.727000
2007-09-07,0.170000
2010-06-11,0.130000
2016-12-19,1.550000
2019-12-18,1.988000
1987-12-01,0.190000
1989-06-02,0.110000
1997-06-06,0.120000
1998-03-06,0.450000
2022-09-14,0.155000
2018-12-19,2.919000
2022-12-14,1.488000
2025-12-16,5.600000
1987-06-01,0.110000
1990-12-07,0.260000
1998-12-17,2.760000
2003-09-05,0.130000
1990-06-01,0.110000
1993-06-04,0.110000
1994-03-04,0.110000
2005-03-04,0.130000
2023-06-14,0.155000
2015-09-18,0.145000
2020-12-16,0.155000
2002-09-06,0.130000
2006-09-01,0.150000
2013-06-13,0.140000
2014-09-19,0.145000
2025-03-12,0.155000
1995-09-01,0.120000
2001-06-01,0.130000
2003-06-06,0.130000
2003-12-16,0.340000
2000-09-01,0.120000
2001-03-02,0.370000
2008-12-18,0.170000
2012-09-14,0.130000
1991-09-06,0.110000
1993-12-17,0.140000
1995-03-03,0.120000
1998-06-05,0.120000
2012-12-21,0.750000
2019-06-14,0.277000
2026-03-18,0.155000
2023-12-13,2.036000
1997-03-07,0.120000
2003-03-03,0.130000
2013-09-13,0.140000
2015-06-19,0.145000
1995-06-02,0.120000
2013-12-23,2.730000
2015-12-18,2.435000
2019-09-13,0.155000
2021-03-17,0.155000
1990-09-07,0.110000
2002-03-01,0.240000
2002-12-16,0.480000
2007-03-02,0.160000
2022-03-16,0.155000
2025-06-11,0.731000
2009-06-05,0.130000
1986-09-02,0.110000
1990-03-02,0.110000
1992-06-05,0.110000
2000-06-02,0.120000
1995-12-15,0.140000
1996-06-07,0.120000
2005-12-22,1.091000
2025-09-17,0.155000
2009-09-03,0.130000
2010-12-23,0.170000
2014-12-23,3.635000
2024-12-17,4.662000
1993-09-03,0.110000
1996-12-24,1.170000
2006-03-03,0.150000
2008-06-06,0.170000
1999-09-03,0.120000
2020-09-16,0.155000
1986-06-02,0.110000
1987-09-01,0.110000
1992-12-18,0.140000
1996-03-01,0.120000
2023-03-15,0.155000
2023-09-13,0.155000
1988-12-16,0.230000
1991-03-01,0.110000
2013-03-13,0.130000
2018-03-16,0.150000
1988-03-01,0.110000
2012-06-08,0.130000
2021-09-15,0.155000
2017-12-18,2.490000
2018-09-14,0.155000
2024-09-18,0.155000
1989-03-03,0.110000
1989-12-15,0.260000
2005-06-03,0.130000
2007-12-19,2.028000
2020-06-17,0.269000
1987-03-02,0.110000
2010-09-17,0.130000
2011-03-04,0.130000
2017-06-16,0.150000
2008-09-05,0.170000
2021-12-15,2.718000
1988-06-01,0.110000
1991-06-07,0.110000
2004-03-05,0.130000
2006-12-21,2.352000
2017-09-15,0.150000
1994-09-02,0.110000
1994-12-16,0.150000
2007-06-01,0.160000
2016-09-16,0.145000
2004-09-03,0.130000
2009-03-06,0.170000
2019-03-15,0.155000
1994-06-03,0.110000
1998-09-04,0.120000
1999-03-05,0.420000
2000-12-18,1.840000
2014-06-13,0.145000
2015-03-13,0.407000
1996-09-06,0.120000
2004-06-04,0.130000
2005-09-02,0.140000
2011-06-10,0.130000
1989-09-01,0.110000
1993-03-05,0.110000
2001-09-07,0.130000