f/overrides/event-backup/diisx-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
2019-12-27,0.497000
1999-12-22,0.180000
2001-12-14,0.127000
2012-12-24,0.394000
2016-12-22,0.425000
2009-12-24,0.417000
2010-12-27,0.325000
2020-12-29,0.305000
2022-12-28,0.375000
2023-12-28,0.605000
1997-12-26,0.100000
2005-12-29,0.274000
2006-12-27,0.382000
2021-12-29,0.689000
2008-12-24,0.272000
2015-12-23,0.319000
2011-12-23,0.439000
2025-12-30,1.094000
2013-12-23,0.562000
2014-12-23,0.434000
2002-06-28,0.047000
2002-10-31,0.051000
2002-12-09,0.195000
2010-04-30,0.024000
2007-12-26,0.488000
2018-12-27,0.400000
2024-12-30,0.602000
1998-12-28,0.090000
2003-12-10,0.463000
2004-12-29,0.270000
2017-12-22,0.389000