f/overrides/event-backup/cmvix-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
2005-12-28,0.037000
2017-12-04,0.964000
2022-12-08,0.057000
2024-07-18,2.110000
1996-12-20,0.050000
1998-12-24,0.026000
2007-12-14,1.741000
1995-03-31,0.053000
1998-09-24,0.029000
2005-01-26,0.075000
2018-12-06,1.307000
2000-03-27,0.040000
2013-12-30,0.211000
1995-09-29,0.050000
2005-12-08,1.376000
2011-12-08,0.100000
2020-12-07,1.183000
1996-03-29,0.050000
1997-12-24,0.027000
2009-12-10,0.069000
2014-07-17,0.139000
1997-09-24,0.028000
1999-09-24,0.019000
2003-12-19,0.087000
1994-09-30,0.054000
1994-12-30,0.053000
1995-06-30,0.049000
1995-12-20,0.050000
1999-06-24,0.028000
2000-09-25,0.039000
2000-11-13,0.225000
2002-12-11,0.767000
2021-07-15,1.750000
2023-07-20,0.027000
2023-12-07,0.192000
2026-07-22,1.229000
1993-12-31,0.048000
1998-06-29,0.020000
2001-03-26,0.045000
2008-12-11,0.069000
2010-12-09,0.099000
1997-03-24,0.035000
1997-11-06,0.363000
1999-11-10,0.249000
2014-12-30,2.253000
1996-09-30,0.050000
2004-12-20,3.205000
2019-12-05,0.727000
2001-12-21,0.020000
2006-12-13,1.813000
2024-12-11,3.221000
1993-06-30,0.061000
1997-06-24,0.035000
1999-03-25,0.039000
2001-06-25,0.020000
2013-01-02,0.008000
2015-12-30,0.911000
2025-12-09,0.991000
2004-12-17,0.077000
2016-12-06,0.110000
1993-09-30,0.047000
1998-03-25,0.026000
1994-03-31,0.054000
1994-06-30,0.054000
1996-06-28,0.050000
2012-12-12,0.135000
2020-07-16,0.350000
2021-12-07,1.588000
2025-07-17,0.909000