f/overrides/event-backup/ngcax-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
2014-12-18,8.901000
2017-12-15,0.940000
2020-12-15,3.167000
2004-12-02,0.210000
2005-12-22,0.451000
2008-12-18,0.535000
2009-12-17,0.220000
2011-12-19,2.612000
2023-12-15,0.159000
1998-12-22,0.062000
2006-12-21,0.243000
2025-12-15,0.765000
2024-12-16,0.367000
1999-04-01,0.020000
2003-12-04,0.114000
2012-12-18,0.528000
2018-12-17,2.453000
2019-12-16,0.768000
2013-12-19,12.168000
2015-12-18,1.749000
1997-12-19,0.061000
2001-12-06,0.152000
2002-12-05,0.081000
2007-12-21,0.495000
2010-12-17,1.526000