f/overrides/event-backup/nclex-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
1991-12-30,0.123000
2018-12-27,2.520000
2019-12-27,1.604000
2021-12-29,5.558000
1994-12-29,0.103000
1996-12-30,2.627000
2000-12-28,5.580000
2011-12-23,1.248000
2016-12-27,2.531000
2010-12-27,1.538000
2024-12-27,0.760000
2025-12-29,1.907000
2012-12-27,2.021000
2017-12-27,2.099000
1987-12-16,0.090000
2002-04-26,0.055000
2004-12-22,0.268000
2020-12-29,1.686000
2023-12-27,0.674000
1999-12-30,0.054000
2001-12-28,0.036000
2006-12-28,0.843000
1988-12-29,0.097000
1989-12-29,0.145000
1992-12-30,0.082000
1995-12-28,0.300000
1998-12-30,1.263000
2007-12-28,1.762000
2008-12-23,0.063000
2009-12-30,0.001000
1990-12-28,0.121000
1997-12-30,2.492000
2013-12-26,1.612000
2014-12-29,2.625000
2015-12-29,1.877000
1993-12-30,0.087000
2002-12-20,0.031000
2005-12-21,1.632000
2022-12-28,1.510000