f/overrides/event-backup/ewo-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
2019-12-16,0.116000
1999-08-25,0.102000
2005-12-23,0.291000
2008-06-25,0.369000
2011-06-22,0.381000
2017-06-20,0.312000
1998-08-25,0.664000
2008-12-23,0.420000
2013-06-27,0.269000
2024-12-17,0.579000
2017-12-19,0.189000
2020-12-14,0.194000
2024-06-11,0.973000
1998-12-22,0.660000
2002-12-23,0.104000
2009-12-22,0.589000
2013-12-18,0.132000
2016-12-21,0.056000
2026-06-15,0.841000
2012-12-18,0.070000
2016-06-22,0.273000
2021-12-13,0.381000
2022-12-13,0.409000
2023-12-20,0.642000
2015-12-21,0.056000
2019-06-17,0.531000
2023-06-07,0.580000
1997-12-23,0.035000
2000-08-24,0.045000
2001-08-24,0.136000
2007-12-20,0.711000
2015-06-25,0.181000
1996-08-26,0.140000
2004-12-23,0.087000
2009-06-23,0.303000
2010-06-23,0.166000
2010-12-21,0.082000
2012-06-21,0.282000
2014-12-17,0.073000
2018-06-19,0.493000
2018-12-18,0.249000
2022-06-09,0.494000
2025-06-16,0.846000
2000-12-20,0.040000
2003-12-22,0.171000
2011-12-20,0.211000
2014-06-25,0.523000
2021-06-10,0.235000