f/overrides/event-backup/iscax-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
2010-04-30,0.005000
2011-12-28,0.283000
2015-12-29,4.106000
2005-12-27,0.167000
2007-12-27,6.218000
2022-12-28,0.259000
2025-12-29,3.569000
1998-12-29,0.285000
2014-12-29,4.048000
2017-12-27,2.605000
2018-12-27,4.360000
2023-12-27,0.306000
2002-10-21,0.059000
2013-12-27,5.393000
2002-07-19,0.059000
2015-12-31,0.156000
2016-12-28,0.291000
2019-12-27,1.723000
2020-12-29,2.537000
2021-12-29,3.348000
1999-12-20,3.613000
2002-06-19,0.058000
2024-12-27,0.676000