f/overrides/event-backup/ewd-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
2020-12-14,0.295000
2022-06-09,0.993000
2025-12-16,0.601000
2013-06-27,1.020000
2014-12-17,0.231000
2019-12-16,0.416000
2009-06-23,0.444000
2011-06-22,1.038000
2013-12-18,0.222000
2016-06-22,1.119000
1998-12-22,0.065000
1999-12-21,1.010000
2008-06-25,1.261000
2015-12-21,0.026000
1999-08-25,0.680000
2012-06-21,0.914000
2015-06-25,1.166000
2014-06-25,1.009000
2016-12-21,0.005000
2018-06-19,1.444000
2020-06-15,0.095000
2023-12-20,0.953000
1996-08-26,0.418000
1996-12-23,0.019000
2003-12-16,0.120000
2005-12-23,0.420000
2008-12-23,0.019000
2022-12-13,0.198000
2024-06-11,0.659000
2026-06-15,1.194000
1997-12-23,0.042000
2000-12-20,0.800000
2004-12-23,0.148000
2017-06-20,0.756000
2018-12-18,0.017000
2025-06-16,1.010000
2000-08-24,5.391000
2003-12-22,0.246000
2007-12-20,1.107000
2021-12-13,1.204000
1998-08-25,0.942000
2019-06-17,0.949000
2021-06-10,1.124000
2006-12-20,0.340000
2009-12-22,0.057000
2010-06-23,0.551000
2017-12-19,0.339000
2021-12-30,0.203000
1997-08-25,0.756000
2001-08-24,0.048000
2002-12-23,0.122000