f/overrides/event-backup/hd-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
2016-11-29,0.690000
2022-11-30,1.900000
1989-03-10,0.000988
1994-03-03,0.006667
1996-09-10,0.013333
2014-06-03,0.470000
2025-03-13,2.300000
1991-11-26,0.003333
2014-09-02,0.470000
2020-09-02,1.500000
2021-03-10,1.650000
2007-11-27,0.225000
2016-05-31,0.690000
1998-09-01,0.020000
1999-08-31,0.026667
2000-06-13,0.040000
2002-09-03,0.050000
2007-08-28,0.225000
2023-11-29,2.090000
1994-09-02,0.008889
2006-09-05,0.150000
2015-12-01,0.590000
2016-03-08,0.690000
2019-06-05,1.360000
2022-06-01,1.900000
2025-12-04,2.300000
2026-03-12,2.330000
1996-03-06,0.011111
1998-03-03,0.016667
1998-12-01,0.020000
2007-06-05,0.225000
2013-12-03,0.390000
2026-06-04,2.330000
2001-11-28,0.050000
2004-06-08,0.085000
2010-03-09,0.236000
2019-12-04,1.360000
1990-11-26,0.002222
1997-03-11,0.013333
2017-08-29,0.890000
2021-12-01,1.650000
2024-03-06,2.250000
2024-11-27,2.250000
1992-03-03,0.003333
2001-06-12,0.040000
2003-09-02,0.070000
2008-09-02,0.225000
2013-09-03,0.390000
1992-11-30,0.005000
1996-06-07,0.013333
2007-03-06,0.225000
2018-11-28,1.030000
2021-09-01,1.650000
2001-03-06,0.040000
2005-06-07,0.100000
2012-03-06,0.290000
1989-11-22,0.001481
1990-02-22,0.001481
2000-03-07,0.040000
2002-03-12,0.050000
2004-03-09,0.070000
2015-03-10,0.590000
1989-07-11,0.001481
1991-03-07,0.002222
2001-11-27,0.050000
2010-08-31,0.236000
2011-08-30,0.250000
1988-06-01,0.000988
1996-12-03,0.013333
1992-05-22,0.005000
1995-06-08,0.011111
2000-08-29,0.040000
2006-06-06,0.150000
2021-06-02,1.650000
2008-06-03,0.225000
2020-12-02,1.500000
2023-03-08,2.090000
2024-08-29,2.250000
2006-03-07,0.150000
2012-11-27,0.290000
1991-07-03,0.003333
1994-06-06,0.008889
1995-09-07,0.011111
1997-06-10,0.016667
2005-08-30,0.100000
2008-12-02,0.225000
2009-12-01,0.225000
2011-06-14,0.250000
2014-03-11,0.470000
1988-03-15,0.000658
2003-03-11,0.060000
2011-11-29,0.290000
2012-05-29,0.290000
1991-08-28,0.003333
1995-02-22,0.008889
2025-06-05,2.300000
1997-12-02,0.016667
1999-06-08,0.026667
2002-06-11,0.050000
2003-06-10,0.060000
2005-03-08,0.100000
1992-08-27,0.005000
2002-12-03,0.060000
2018-03-07,1.030000
2018-05-30,1.030000
2022-03-09,1.900000
1998-06-09,0.020000
2017-03-07,0.890000
1995-12-06,0.011111
2004-08-31,0.085000
2016-08-30,0.690000
2025-09-04,2.300000
2017-05-30,0.890000
2020-03-11,1.500000
2023-05-31,2.090000
1987-11-19,0.000658
2006-11-28,0.225000
2010-06-01,0.236000
2010-11-30,0.236000
2012-08-28,0.290000
1988-12-07,0.000988
1993-06-10,0.006667
2024-05-30,2.250000
1993-03-04,0.005000
1994-12-01,0.008889
1999-03-02,0.020000
2008-03-11,0.225000
2014-12-02,0.470000
2015-06-02,0.590000
2023-08-30,2.090000
1990-07-16,0.002222
1990-08-23,0.002222
1999-11-30,0.040000
2005-11-29,0.100000
2013-03-12,0.390000
1993-11-24,0.006667
1997-09-09,0.016667
2004-11-30,0.085000
2013-06-04,0.390000
2017-11-29,0.890000
2020-06-03,1.500000
1993-08-31,0.006667
2001-08-28,0.040000
2009-06-09,0.225000
2011-03-08,0.250000
2019-09-04,1.360000
1988-08-30,0.000988
2003-12-02,0.070000
2018-08-29,1.030000
2019-03-13,1.360000
2022-08-31,1.900000
1989-08-25,0.001481
2000-11-28,0.040000
2009-03-10,0.225000
2009-09-01,0.225000
2015-09-01,0.590000