f/overrides/event-backup/emf-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
2020-12-14,0.477000
2016-12-13,0.196000
2025-06-16,0.220000
1989-12-12,0.180000
1998-11-16,4.530000
1999-10-27,0.124000
2001-10-24,0.095000
2019-12-13,1.148000
1992-10-13,5.730000
1992-12-10,0.290000
2000-12-27,0.005000
1991-12-16,3.625000
2001-12-27,0.013000
2004-11-03,0.185000
2014-12-12,1.182000
2017-12-14,1.118000
1988-10-04,0.170000
1994-12-23,0.008000
2005-12-28,0.220000
2025-03-17,0.220000
2026-06-23,0.240000
1996-10-29,0.750000
2005-11-02,1.375000
2013-12-11,1.690000
1990-12-06,0.100000
1995-12-27,0.110000
1997-12-29,0.440000
2025-12-15,0.996000
1994-10-28,0.008000
1998-12-29,0.024000
2007-12-19,0.127000
2009-12-14,0.141000
2011-12-13,0.276000
1989-10-10,0.150000
1996-12-27,0.380000
2021-12-14,1.110000
2023-12-15,0.727000
1993-12-27,0.370000
1997-10-29,2.000000
2003-10-23,0.013000
2003-11-04,0.212000
2012-12-12,0.288000
1991-10-10,0.410000
2018-12-14,0.781000
2022-12-16,1.129000
2026-03-24,0.220000
1999-12-28,0.010000
2000-11-06,0.098000
2004-12-29,0.061000
2007-10-31,2.040000
1988-12-12,0.150000
1990-10-11,1.780000
1993-10-25,0.970000
2003-12-29,0.020000
2006-11-01,3.485000
1987-12-14,0.300000
1995-10-27,2.315000
2008-12-12,1.444000
2002-10-23,0.149000
2010-12-14,0.149000
2015-12-14,1.278000
2024-12-16,0.511000
2025-09-18,0.220000