f/overrides/event-backup/aiiex-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
2024-12-12,1.614000
1994-12-15,0.042000
1996-12-16,0.449000
1997-12-15,0.063000
2013-12-13,0.363000
2020-12-11,4.107000
2023-12-13,0.358000
1998-12-16,0.316000
2014-12-12,1.566000
2005-12-16,0.177000
2009-12-11,0.294000
2015-12-11,0.385000
2019-12-13,3.489000
2025-12-11,3.744000
1995-12-15,0.006000
2000-12-14,1.484000
2003-12-12,0.022000
2007-12-14,2.017000
2022-12-16,2.348000
1992-12-15,0.013000
2018-12-14,2.752000
2021-12-16,6.939000
1993-12-15,0.011000
2006-12-15,0.276000
2008-12-12,0.392000
2010-04-30,0.028000
2016-12-13,0.372000
2017-12-13,0.927000
1999-12-15,0.926000
2010-12-10,0.267000
2011-12-09,0.323000
2012-12-07,0.288000