f/overrides/event-backup/ewm-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
2003-12-22,0.416000
2010-06-23,0.436000
2004-12-23,0.632000
2008-12-23,0.712000
2011-06-22,0.612000
2021-06-10,0.841000
1997-12-23,0.076000
2013-12-18,0.880000
2022-06-09,0.465000
2018-06-19,0.635000
2012-06-21,0.372000
2014-12-17,1.116000
2020-06-15,0.545000
1999-08-25,0.068000
2016-06-22,0.420000
2024-06-11,0.363000
2025-06-16,0.508000
2025-12-16,0.425000
1998-08-25,0.240000
2019-06-17,0.518000
2023-06-07,0.365000
2023-12-20,0.372000
2013-06-27,0.892000
1996-08-26,0.028000
1998-11-06,0.704000
2009-06-23,0.408000
2010-12-21,0.944000
2011-12-20,1.776000
2002-12-23,0.372000
2015-06-25,0.636000
1997-08-25,0.108000
2013-12-27,0.148000
2021-12-13,0.782000
2026-06-15,0.572000
2000-08-24,0.212000
2014-06-25,1.056000
2019-12-16,0.311000
2000-12-20,0.060000
2001-08-24,0.188000
2003-12-16,0.360000
2012-12-18,0.584000
2006-12-20,0.780000
2009-12-22,0.568000
2017-06-20,0.351000
2024-12-17,0.451000
1998-12-22,0.036000
2001-12-24,0.120000
2005-12-23,1.156000
2008-06-25,0.812000
2016-12-21,1.256000
2017-12-19,1.490000
2015-12-21,10.988000
2007-12-20,1.624000
2018-12-18,0.508000
2022-12-13,0.219000