f/overrides/event-backup/ewg-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
1998-12-22,0.040000
2001-08-24,0.189000
2002-12-23,0.122000
2013-06-27,0.435000
2014-06-25,0.631000
2016-06-22,0.613000
1997-08-25,0.131000
2024-06-11,0.758000
1999-08-25,0.469000
2010-06-23,0.285000
2022-06-09,0.792000
1998-08-25,0.273000
2015-06-25,0.506000
2017-06-20,0.595000
2021-12-30,0.247000
2009-12-22,0.014000
2003-12-22,0.201000
2004-12-23,0.194000
2005-12-23,0.116000
2006-12-20,0.508000
2009-06-23,0.544000
2012-06-21,0.581000
2020-06-15,0.280000
1997-12-23,0.030000
2008-06-25,1.149000
2008-12-23,0.073000
2011-06-22,0.674000
2016-12-21,0.009000
2018-06-19,0.744000
2026-06-15,0.832000
2007-12-24,0.518000
2017-12-19,0.084000
2021-06-10,0.603000
2021-12-13,0.036000
2025-06-16,0.679000
1996-08-26,0.119000
2019-06-17,0.738000
2020-12-14,0.387000
2022-12-13,0.009000
2023-06-07,0.759000
2023-12-20,0.002000
2000-08-24,2.532000