f/overrides/event-backup/merdx-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
1992-09-15,0.034000
1994-09-21,0.051000
2007-12-18,3.637000
2008-12-16,1.183000
2016-12-20,0.201000
1987-09-08,1.030000
1991-09-24,0.091000
2004-12-15,0.560000
2018-12-20,5.452000
1997-12-29,1.358000
2000-09-26,2.990000
2010-12-15,0.073000
2024-12-20,0.044000
1996-12-27,0.939000
2002-09-25,0.664000
1995-12-27,0.156000
1996-09-20,2.181000
2005-12-15,0.803000
2013-11-13,13.232000
2015-12-17,3.736000
2025-12-19,2.823000
1986-09-02,1.230000
1987-12-23,0.210000
1995-09-22,0.152000
1999-09-30,1.932000
2020-12-18,0.421000
1990-09-21,0.258000
1990-12-26,0.096000
1994-12-28,0.124000
2000-12-21,1.305000
2003-09-25,0.460000
2009-12-22,0.138000
2011-12-15,3.343000
2017-12-20,2.943000
1985-09-17,0.100000
1989-12-22,0.478000
2012-12-18,7.032000
2019-12-20,3.549000
2022-12-21,4.098000
1998-09-23,6.645000
2003-12-23,0.688000
1997-09-23,3.772000
2001-12-21,0.320000
2006-12-15,3.132000
2014-12-17,4.283000
2021-12-21,7.398000
1993-09-22,0.282000
1993-12-21,0.021000