f/overrides/event-backup/demax-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
2011-12-22,0.269000
2020-12-18,0.143000
2009-12-22,0.005000
2010-12-22,0.085000
2021-12-17,0.527000
2023-12-18,0.535000
2024-12-16,0.353000
1998-12-22,0.070000
2019-12-19,0.117000
2015-12-22,0.004000
2022-12-16,0.271000
2003-12-22,0.202000
2014-12-22,0.413000
2006-12-21,5.821000
1996-12-20,0.085000
2001-12-21,0.130000
2007-12-21,5.715000
2013-12-20,0.117000
2025-12-15,5.938000
2004-12-22,0.476000
2005-12-22,1.169000
2002-12-20,0.173000
2008-12-22,0.839000
2021-12-31,0.239000
1997-12-22,0.625000
1999-12-22,0.120000
2016-12-22,0.102000
2017-12-22,0.320000
2018-12-21,0.056000
2000-12-22,0.026000
2012-12-21,0.109000