f/overrides/event-backup/aef-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
2010-09-10,0.460000
2011-03-29,0.510000
2012-03-28,0.430000
2018-04-18,0.245000
2020-03-19,0.054000
1997-09-10,0.260000
2008-09-03,0.200000
2005-12-19,3.080000
2008-12-24,0.720000
2016-09-19,0.140000
2017-12-28,0.232000
2019-12-30,0.045000
2021-06-22,0.160000
1996-12-27,0.860000
2000-09-06,0.040000
2022-06-21,0.110000
2024-09-23,0.100000
2014-06-19,0.280000
2014-09-18,0.260000
2018-12-28,0.194000
2024-12-30,0.100000
2025-03-25,0.150000
2006-09-01,0.270000
2010-04-09,0.410000
2013-06-26,0.380000
2025-06-23,0.150000
2001-12-26,0.140000
2009-07-10,0.360000
2015-12-29,0.150000
2019-06-20,0.040000
2022-12-29,0.090000
2004-12-17,1.870000
2015-03-19,0.190000
1999-12-13,0.630000
2007-09-04,0.520000
2009-09-11,0.350000
2010-12-17,0.490000
2011-06-28,0.520000
2012-12-27,0.380000
1991-12-18,1.440000
1999-09-08,0.020000
2020-12-30,0.134000
2023-09-21,0.100000
2014-12-29,0.200000
2015-06-18,0.180000
2011-09-19,1.333000
2013-12-27,0.340000
2014-03-20,0.310000
2026-03-24,0.210000
2002-12-19,0.018000
2010-12-14,1.659000
2013-09-26,0.360000
2016-06-16,0.140000
2021-12-29,0.150000
1995-12-27,0.810000
2012-09-26,0.380000
2016-03-16,0.140000
2020-09-18,0.044000
2025-09-23,0.170000
2004-09-01,0.360000
2005-09-01,1.260000
2020-06-18,0.043000
1997-12-29,3.140000
2019-09-20,0.045000
2002-09-04,0.070000
2006-12-18,0.850000
2007-12-26,1.990000
2023-03-23,0.100000
1992-12-21,0.841500
1995-09-13,0.060000
2022-03-23,0.140000
2023-12-28,0.090000
2025-12-31,0.180000
1992-08-31,0.769000
2003-09-03,0.070000
2003-12-19,0.380000
2011-12-28,0.510000
1993-12-21,0.725500
2001-09-05,0.870000
1998-09-09,1.820000
1998-12-29,0.700000
2012-06-27,0.410000
2015-09-17,0.160000
2018-06-14,0.882000
2021-03-23,0.063000
1989-12-15,0.170000
1996-09-11,0.030000
2023-06-22,0.100000
2024-03-20,0.090000
2021-09-17,0.160000
2022-09-22,0.100000
2013-03-26,0.390000
2024-06-21,0.100000
2026-06-23,0.230000
1990-12-17,0.625000
2009-12-18,0.360000
2000-12-26,0.007000
2010-07-09,0.440000
2019-03-20,0.040000
1991-08-05,0.138500
1994-12-21,0.350000