f/overrides/event-backup/eza-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
2010-12-21,1.549000
2015-12-21,0.843000
2020-06-15,0.645000
2026-06-15,1.434000
2011-12-20,1.066000
2013-06-27,0.653000
2014-12-17,0.803000
2004-12-23,0.604000
2006-12-20,1.252500
2007-12-20,1.309000
2009-06-23,0.987000
2010-06-23,0.266000
2015-06-25,0.571000
2017-12-19,0.617000
2025-12-16,3.611000
2008-06-25,1.415500
2011-06-22,0.857000
2023-06-07,0.681000
2022-06-09,0.998000
2023-12-20,0.506000
2024-12-17,2.415000
2009-12-22,1.087000
2012-06-21,1.030000
2012-12-18,1.125000
2018-12-18,1.067000
2019-06-17,1.315000
2014-06-25,0.623000
2019-12-16,4.705000
2021-12-13,0.458000
2003-12-22,0.341000
2020-12-14,1.771000
2021-06-10,0.491000
2024-06-11,0.627000
2005-12-23,0.982500
2008-12-23,0.921000
2013-12-18,0.921000
2016-06-22,1.599000
2018-06-19,0.857000
2016-12-21,0.550000
2017-06-20,0.465000
2022-12-13,0.657000
2025-06-16,0.626000