f/overrides/event-backup/ewa-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
2010-12-21,0.627000
2014-06-25,0.393000
2018-06-19,0.432000
2021-12-13,0.667000
2023-06-07,0.417000
1997-08-25,0.329000
1999-12-21,0.017000
2001-08-24,0.190000
2007-12-20,1.277000
2009-06-23,0.048000
2020-06-15,0.284000
2012-06-21,0.456000
2000-12-20,0.032000
2008-12-23,0.890000
2019-12-16,0.456000
2010-06-23,0.203000
2018-12-18,0.745000
2021-06-10,0.376000
1999-08-25,0.235000
2015-06-25,0.530000
2001-12-24,0.040000
2024-06-11,0.469000
1996-08-26,0.187000
2005-12-23,0.667000
2009-12-22,0.615000
2017-06-20,0.470000
2025-06-16,0.397000
2025-12-16,0.444000
2004-12-23,0.575000
2012-12-18,0.895000
2016-06-22,0.276000
2020-12-14,0.200000
1998-08-25,0.167000
2000-08-24,0.233000
2002-12-23,0.265000
2006-12-20,1.100000
2013-12-27,0.024000
2015-12-21,0.509000
1996-12-23,0.115000
2022-12-13,0.430000
2003-12-16,0.270000
2011-12-20,0.652000
2013-12-18,0.576000
2017-12-19,0.559000
2019-06-17,0.443000
2021-12-30,0.219000
2016-12-21,0.540000
2023-12-20,0.488000
1997-12-23,0.063000
2003-12-22,0.430000
2011-06-22,0.435000
2013-06-27,0.542000
1998-12-22,0.016000
2026-06-15,0.405000
2014-12-17,0.697000
2022-06-09,0.743000
2024-12-17,0.417000