f/overrides/event-backup/mcoax-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
2015-06-30,0.019000
2016-06-30,0.051000
2002-03-28,0.069000
2006-12-14,0.102000
2010-12-20,0.085000
2023-09-29,0.048000
2002-06-28,0.061000
2016-12-13,0.369000
2021-12-06,4.697000
2024-03-28,0.028000
1997-12-19,1.369000
2003-03-31,0.054000
2008-03-26,0.041000
2022-03-31,0.012000
1996-12-27,0.821000
2024-09-30,0.053000
2005-09-30,0.077000
1998-03-31,0.137000
2020-03-31,0.030000
2001-06-29,0.068000
2014-03-28,0.018000
2014-06-27,0.014000
2025-03-31,0.060000
2004-06-30,0.035000
2007-03-28,0.061000
2014-12-08,1.856000
2020-12-07,1.521000
2022-09-30,0.023000
2006-03-28,0.033000
2026-03-31,0.035000
2023-06-30,0.047000
2020-09-30,0.011000
2021-09-30,0.012000
2023-12-14,0.613000
2005-06-30,0.061000
2025-12-08,1.538000
2007-12-07,1.278000
2010-09-29,0.086000
2011-03-30,0.066000
2012-03-30,0.067000
2013-09-27,0.027000
2015-12-10,1.184000
1996-06-28,0.146000
2003-09-30,0.054000
2017-12-11,1.107000
2020-06-30,0.019000
2003-06-30,0.044000
2001-12-18,0.080000
2008-09-24,0.070000
2021-03-31,0.009000
2001-03-30,0.124000
2023-03-31,0.051000
2006-06-27,0.037000
2012-06-28,0.071000
2022-12-15,0.594000
1998-06-30,0.115000
2002-09-30,0.061000
2009-06-26,0.090000
2017-03-31,0.032000
2018-09-28,0.036000
2018-12-10,0.891000
1997-09-30,0.161000
1996-03-29,0.120000
1997-03-31,0.138000
1998-12-22,0.822000
2006-09-26,0.044000
2017-06-30,0.040000
1995-06-30,0.142000
2019-09-30,0.023000
2022-06-30,0.014000
2019-06-28,0.021000
2007-09-26,0.068000
2007-12-12,0.065000
2009-09-25,0.091000
2010-06-29,0.081000
2018-03-29,0.051000
2019-03-29,0.046000
2024-06-28,0.046000
2004-12-16,0.035000
2011-12-13,0.869000
2016-03-31,0.056000
2017-09-29,0.056000
1996-09-30,0.163000
2001-09-28,0.092000
2005-12-15,0.043000
2013-06-27,0.043000
2013-12-06,0.694000
2015-09-30,0.026000
2019-12-09,0.380000
2025-06-30,0.062000
1997-06-30,0.155000
2026-06-30,0.042000
2002-12-19,0.057000
2015-03-31,0.029000
1995-09-29,0.133000
2004-09-30,0.040000
2010-03-30,0.093000
2012-12-05,0.765000
2018-06-29,0.036000
1999-09-30,0.132000
1999-06-30,0.126000
1999-12-21,1.661000
2000-09-29,0.164000
2012-09-27,0.072000
2025-09-30,0.067000
1995-12-29,0.129000
2003-12-18,0.045000
1998-09-30,0.137000
2008-06-25,0.058000
2011-09-29,0.084000
2000-06-30,0.129000
2009-03-27,0.127000
2009-12-16,0.093000
2016-09-30,0.051000
2021-06-30,0.014000
2024-12-16,0.788000
1999-03-31,0.138000
2000-03-31,0.124000
1995-03-31,0.146000
2004-03-31,0.046000
2008-11-24,0.026000
2011-06-29,0.088000
2013-03-28,0.097000
2014-09-29,0.016000
2000-12-19,2.655000