f/overrides/event-backup/iaf-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
2009-06-26,0.690000
2024-08-23,0.360000
2000-06-28,0.600000
2006-03-29,0.900000
2008-03-27,1.230000
2017-12-28,0.480000
1988-06-28,0.210000
2001-12-27,0.444000
2016-06-16,0.480000
2011-09-28,0.870000
2021-02-18,0.450000
2022-11-21,0.360000
2023-05-18,0.390000
1992-12-24,0.279000
2000-09-27,0.570000
2005-03-29,0.780000
2001-09-26,0.459000
2007-09-26,1.080000
2018-06-20,0.480000
1989-12-22,0.915000
1994-06-24,0.360000
2001-03-28,0.510000
2003-03-27,0.075000
2007-12-27,1.860000
2013-09-26,0.750000
2016-03-16,0.510000
1987-12-16,3.000000
1993-06-24,0.240000
1997-12-29,0.699000
1989-06-27,0.465000
2006-11-30,0.960000
2016-09-19,0.480000
2010-03-29,0.750000
2001-06-27,0.489000
2002-03-26,0.075000
2003-06-26,0.075000
2002-09-26,0.180000
2023-02-17,0.390000
1999-12-29,0.633000
2006-06-28,0.930000
2024-11-21,0.390000
2004-09-28,0.720000
2008-12-29,0.990000
2024-02-21,0.360000
1994-12-23,0.225000
2014-03-20,0.690000
2015-03-19,0.630000
1997-06-26,0.270000
1999-03-29,0.600000
2012-09-26,1.251000
2019-09-20,0.420000
1991-06-24,0.645000
2013-11-14,0.750000
2017-09-21,0.480000
2022-02-18,0.450000
1987-05-26,0.300000
2004-12-29,0.750000
2005-09-28,0.840000
2013-03-26,0.750000
2019-12-30,0.420000
1990-12-24,0.630000
2009-09-28,0.600000
2010-12-28,0.840000
2021-08-19,0.480000
2021-11-18,0.480000
1991-12-23,0.465000
2018-12-28,0.450000
2019-06-20,0.420000
2012-12-27,0.750000
2014-09-18,0.660000
1998-09-28,0.615000
1999-09-28,0.618000
2012-03-28,0.840000
2014-12-29,0.660000
2017-03-16,0.480000
2020-08-20,0.360000
2025-08-22,0.360000
1992-06-24,0.390000
2002-12-27,0.285000
2008-06-26,1.230000
2012-06-27,0.780000
2023-11-21,0.330000
1996-12-27,0.795000
2013-06-26,0.780000
2020-05-20,0.360000
2020-11-19,0.390000
1990-06-25,0.930000
2009-12-29,0.660000
2010-09-28,0.810000
2018-03-16,0.480000
1995-12-27,1.032000
1998-03-27,0.684000
2006-09-27,0.960000
2025-02-21,0.360000
1988-12-22,0.216000
2005-06-28,0.780000
2006-12-27,0.480000
2026-02-20,0.360000
1996-06-26,0.345000
1998-12-29,0.600000
2018-09-21,0.480000
2004-03-29,0.660000
2010-06-28,0.810000
2015-09-17,0.570000
2024-05-22,0.360000
1993-12-27,0.279000
1995-06-28,0.330000
1998-06-26,0.660000
2017-06-16,0.480000
2020-03-19,0.420000
2022-08-23,0.390000
2025-05-22,0.360000
2000-12-27,0.570000
2009-03-27,0.840000
2011-03-29,0.840000
2021-05-20,0.450000
2026-05-21,0.360000
2007-03-28,0.990000
2008-09-26,1.200000
2011-06-28,0.870000
2000-03-29,0.630000
2014-06-19,0.660000
2023-08-23,0.360000
2022-05-19,0.450000
2003-12-29,0.270000
2007-06-27,1.020000
2015-06-18,0.600000
2019-03-20,0.450000
2004-06-28,0.690000
2005-12-28,1.350000
2011-12-28,0.870000
2026-08-24,0.350000
1999-06-28,0.600000
2002-06-26,0.075000
2025-11-21,0.380000
2003-09-26,0.075000
2015-12-29,0.540000
2016-12-28,0.480000