f/overrides/event-backup/aphix-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
2010-12-16,0.231000
2024-12-10,2.814000
2025-12-10,6.802000
1997-12-10,0.219000
2007-12-19,0.269000
2011-12-15,0.337000
2017-11-21,0.304000
2018-11-20,2.732000
1998-09-30,0.049000
2006-12-20,0.486000
2014-11-19,0.286000
2016-11-17,0.387000
2001-11-15,0.100000
2003-11-13,0.212000
2013-11-21,0.344000
2015-11-19,0.211000
2005-11-22,0.455000
2012-12-19,0.321000
2009-12-17,0.283000
2023-12-07,0.566000
1999-11-11,0.060000
2002-11-14,0.127000
2004-11-18,0.163000
2008-12-17,0.261000
2019-11-21,1.819000
2020-11-24,1.201000
2021-11-23,7.209000
2022-11-22,0.682000