f/overrides/event-backup/ibnax-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
2006-06-15,0.040000
2015-03-12,0.020000
2016-06-16,0.045000
2012-09-13,0.025000
2016-09-15,0.045000
1990-12-26,0.137000
2000-06-22,0.072000
2001-12-20,0.079000
2020-09-10,0.060000
2025-06-20,0.098000
1996-06-26,0.085000
2000-09-21,0.076000
2011-09-15,0.030000
2018-06-14,0.080000
1988-10-21,0.167000
1995-03-28,0.118000
2014-03-13,0.015000
2009-12-10,0.081000
2016-12-08,0.450000
2017-03-16,0.040000
1998-03-25,0.081000
2003-06-27,0.020000
2003-12-18,0.017000
2021-06-10,0.015000
2023-06-22,0.063000
2024-03-22,0.288000
1999-09-23,0.081000
2014-09-11,0.023000
2014-12-11,0.835000
2010-09-16,0.041000
2021-09-16,0.025000
2002-06-21,0.064000
2007-09-13,0.045000
2008-03-13,0.045000
2010-12-09,0.077000
2011-03-10,0.020000
2013-06-13,0.015000
2021-12-16,3.089000
1994-09-29,0.096000
1994-12-28,0.108000
2004-03-11,0.026000
1991-09-26,0.129000
2010-04-01,0.012000
2023-03-22,0.063000
2023-09-22,0.056000
2006-12-14,0.060000
2018-03-15,0.030000
2018-12-13,2.349000
2004-09-16,0.026000
2005-06-16,0.028000
2021-03-11,0.020000
1991-03-26,0.134000
1996-12-26,0.104000
1998-09-24,0.070000
2019-12-12,1.693000
2025-12-12,0.447000
1997-12-23,0.443000
2012-12-13,0.253000
2013-03-14,0.010000
2001-09-20,0.039000
1994-06-28,0.079000
1999-06-24,0.078000
2001-03-22,0.047000
1990-03-26,0.139000
2010-03-11,0.032000
2020-12-10,1.635000
2009-03-12,0.045000
2009-06-11,0.050000
2017-06-15,0.134000
2025-03-21,0.083000
1988-07-20,0.126000
2000-03-23,0.069000
2005-12-15,0.042000
1996-09-25,0.089000
1997-09-24,0.111000
2006-03-16,0.035000
2006-09-14,0.040000
2007-12-13,0.578000
1988-04-20,0.101000
1989-03-30,0.099000
1993-03-29,0.084000
2024-09-20,0.073000
2025-09-22,0.067000
2015-06-11,0.045000
2015-12-10,1.346000
2024-06-21,0.079000
1988-12-30,0.194000
1991-12-27,0.105000
2019-09-12,0.080000
1989-09-22,0.129000
1990-09-21,0.148000
2007-06-14,0.045000
2022-09-15,0.053000
1998-12-22,0.065000
2001-06-21,0.014000
2003-09-26,0.026000
2012-03-15,0.030000
2014-06-12,0.023000
2022-12-15,4.686000
2026-03-20,0.080000
1996-03-27,0.079000
2008-06-12,0.045000
2011-12-08,0.179000
2026-06-22,0.102000
2002-09-27,0.065000
2002-12-27,0.052000
2012-06-14,0.030000
2022-06-07,0.027000
1989-12-29,0.356000
1994-03-28,0.056000
2010-06-10,0.032000
1995-09-28,0.098000
1998-06-25,0.083000
2013-12-12,0.581000
1991-06-26,0.110000
1992-03-26,0.088000
1993-09-28,0.076000
2005-03-10,0.020000
2011-06-16,0.030000
1992-09-28,0.092000
1993-12-28,0.062000
1999-12-21,0.079000
2008-09-11,0.045000
2008-12-11,0.022000
2015-09-10,0.045000
1992-12-28,0.085000
1997-03-26,0.090000
2003-03-28,0.057000
1995-12-28,0.372000
2023-12-15,0.048000
1995-06-28,0.115000
2000-12-21,0.099000
2019-06-13,0.080000
2009-09-10,0.045000
2017-12-14,0.876000
1987-12-17,0.285000
2004-12-16,0.064000
2007-03-15,0.040000
2004-06-17,0.026000
2018-09-13,0.100000
2019-03-14,0.030000
2020-03-12,0.030000
2020-06-11,0.040000
1989-06-23,0.140000
1993-06-28,0.064000
1997-06-25,0.090000
2022-03-10,0.026000
1990-06-22,0.142000
2005-09-15,0.030000
2017-09-14,0.100000
2013-09-12,0.015000
1992-06-26,0.096000
1999-03-19,0.085000
2002-03-28,0.046000