f/overrides/event-backup/caibx-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
2015-12-22,0.520000
1988-09-16,0.295000
1989-03-16,0.305000
2000-03-15,0.495000
2004-12-10,1.360000
2011-06-17,0.465000
2011-09-16,0.470000
2015-03-13,0.500000
2020-03-16,0.500000
2024-06-10,0.450000
1995-03-24,0.430000
1997-03-10,0.465000
2005-03-18,0.460000
2024-12-19,2.619000
1992-06-12,0.375000
1996-06-04,0.455000
2000-09-20,0.505000
2014-09-19,0.500000
1987-09-18,0.220000
1987-12-28,0.280000
1993-03-30,0.390000
1994-09-16,0.420000
2005-06-20,0.465000
2021-06-14,0.400000
1991-09-05,0.360000
1992-09-11,0.380000
2003-06-20,0.505000
2020-06-15,0.500000
2026-06-15,0.480000
2012-09-21,0.485000
2017-03-15,0.500000
2009-09-25,0.450000
2020-12-18,0.630000
2022-03-14,0.420000
2022-06-13,0.420000
2025-09-15,0.465000
1992-03-06,0.370000
2007-09-20,0.505000
2023-09-11,0.435000
2018-06-13,0.500000
2021-03-15,0.400000
2021-12-17,1.005000
1993-12-27,0.405000
2006-06-20,0.480000
2007-12-20,3.460000
2015-09-16,0.500000
2023-03-13,0.435000
2004-03-19,0.450000
2014-12-23,0.885000
1991-12-06,0.365000
1995-06-21,0.435000
1996-08-13,0.460000
2010-03-19,0.420000
2011-03-18,0.460000
2013-12-19,0.505000
2014-03-14,0.900000
1991-06-18,0.355000
1999-12-14,2.035000
2001-03-14,0.515000
2008-09-19,0.530000
2016-06-15,0.500000
2017-12-22,1.437000
1994-04-04,0.410000
1994-06-24,0.415000
1998-06-16,0.485000
2000-12-14,1.450000
2003-03-20,0.505000
2018-09-12,0.500000
2022-12-16,0.900000
1993-06-25,0.395000
1998-09-08,0.490000
2022-09-12,0.420000
1990-09-11,0.340000
1994-12-09,0.425000
1995-12-18,0.445000
1999-06-07,0.485000
2004-08-31,0.150000
2004-09-20,0.455000
2009-12-18,0.615000
2025-12-18,4.537000
1996-03-04,0.450000
2010-09-17,0.450000
2014-06-13,0.500000
2018-12-21,0.640000
2020-09-14,0.500000
1998-12-14,3.305000
2002-12-12,1.028000
2003-09-19,0.505000
2004-07-30,0.150000
2011-12-20,0.690000
2012-03-16,0.475000
2019-03-13,0.500000
2013-09-20,0.490000
2016-12-23,0.530000
2017-06-14,0.500000
2019-12-20,1.183000
2023-12-15,0.993000
2005-09-20,0.470000
2013-03-15,0.485000
2016-03-16,0.500000
2016-09-14,0.500000
1997-06-09,0.470000
2000-06-20,0.500000
2009-03-20,0.440000
2018-03-14,0.500000
2019-09-11,0.500000
2024-03-11,0.450000
1992-12-18,0.385000
1995-09-15,0.440000
2002-09-20,0.510000
2003-12-12,0.623000
2017-09-13,0.500000
2013-06-14,0.490000
1989-09-11,0.315000
1990-03-19,0.330000
1990-06-12,0.335000
1990-12-11,0.345000
2008-03-20,0.520000
2008-12-19,0.985000
2012-12-20,0.760000
2019-06-12,0.500000
2023-06-12,0.435000
1991-03-07,0.350000
1997-09-11,0.475000
2025-03-10,0.465000
2025-06-09,0.465000
1988-03-18,0.285000
1989-12-18,0.325000
2002-06-20,0.510000
2006-09-20,0.485000
2009-06-19,0.450000
2010-12-20,0.690000
2021-09-13,0.400000
1989-06-09,0.310000
1999-09-02,0.490000
2015-06-17,0.500000
1996-12-06,1.195000
1997-12-22,2.090000
1998-03-23,0.480000
1999-03-31,0.480000
2001-06-20,0.520000
2001-09-20,0.525000
2005-12-20,0.940000
2024-09-16,0.450000
1988-06-14,0.290000
1993-09-17,0.400000
2026-03-16,0.480000
1988-12-28,0.300000
2002-03-20,0.510000
2007-03-20,0.495000
2008-06-20,0.525000
2010-06-18,0.450000
2012-06-15,0.480000
2002-10-25,0.069000
2003-09-22,0.505000
2006-03-20,0.475000
2006-12-20,1.960000
2001-12-13,1.696000
2007-06-20,0.500000