f/overrides/event-backup/agthx-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
1998-12-23,2.300000
2010-12-21,0.245000
2022-12-16,2.006000
1982-10-06,0.147500
1990-12-14,0.120000
2003-12-12,0.006000
2016-12-21,2.779000
2020-12-18,2.905000
1983-10-03,0.100000
1987-09-01,0.062500
1991-12-13,0.087500
1993-12-15,0.272500
2000-12-15,4.240000
2013-12-18,2.886000
2014-12-17,4.225000
2015-12-22,3.664000
1980-09-25,0.037500
1981-09-30,0.113000
1992-12-16,0.047500
1994-12-21,0.302500
1996-12-13,0.970000
2001-12-14,0.045000
2004-12-10,0.090000
2017-12-20,3.484000
2018-12-21,5.125000
2024-12-18,6.691000
1986-10-10,0.070000
1995-12-20,0.640000
2006-12-18,1.374000
2008-12-22,0.234000
2012-12-19,0.283000
2019-12-20,3.655000
2023-12-15,4.671000
2025-12-17,8.604000
1984-10-01,0.072500
1985-10-04,0.055000
1987-12-11,0.010000
1989-12-07,0.152500
2002-12-13,0.019000
2007-12-18,2.416000
2009-12-21,0.211000
1988-12-09,0.077500
1997-12-17,2.190000
1999-12-16,3.240000
2005-12-19,0.415000
2011-12-20,0.219000
2021-12-17,6.079000