f/overrides/event-backup/ethsx-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
2002-06-17,0.036000
2007-12-24,1.800000
2008-12-23,1.346000
2025-12-04,0.978000
2001-09-20,0.450000
2002-10-15,0.032000
2014-12-16,2.018000
2024-12-05,0.623000
1997-08-26,0.032667
2011-12-28,0.904000
2017-12-21,0.291000
2009-12-30,0.007000
2018-12-04,0.572000
1999-10-01,0.127333
2021-12-09,1.206000
2023-12-07,0.325000
2000-12-12,0.046000
2004-01-15,0.033000
2006-12-20,0.171000
2010-04-30,0.029000
2015-12-15,1.172000
2016-12-13,1.161000
1996-09-18,0.033833
1998-12-22,0.074667
2010-12-29,0.610000
2012-12-20,1.472000
2013-12-17,1.434000
2020-12-10,0.955000
1985-11-05,0.001333
1999-12-14,0.030667
2000-09-29,0.154333
2019-12-03,0.668000
2022-12-08,0.562000