f/overrides/event-backup/efa-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
2019-06-17,1.376000
2020-06-15,0.858000
2001-10-02,0.055333
2004-12-23,0.803000
2009-06-23,0.945000
2009-12-22,0.496000
2013-12-18,0.552000
2017-12-19,0.743000
2021-06-10,1.102000
2024-06-11,1.393000
2007-12-24,2.000000
2021-12-13,1.352000
2011-12-20,0.569000
2013-06-27,1.152000
2015-12-21,0.508000
2016-12-21,0.596000
2024-12-17,1.057000
2026-06-15,1.636000
2025-06-16,1.519000
2001-12-24,0.027333
2003-12-22,0.522667
2005-12-23,1.110000
2012-06-21,1.149000
2018-06-19,1.354000
2020-12-14,0.694000
2002-12-23,0.627333
2008-12-23,0.541000
2010-12-21,0.538000
2018-12-18,0.638000
2022-06-09,1.498000
2025-12-16,1.728000
2003-12-16,0.156667
2010-06-23,0.859000
2011-06-22,1.141000
2019-12-16,0.776000
2023-06-07,1.311000
2023-12-20,0.931000
2012-12-18,0.610000
2014-06-25,1.676000
2015-06-25,1.111000
2017-06-20,1.062000
2021-12-30,0.163000
2022-12-13,0.268000
2006-12-21,1.533000
2008-06-25,1.308000
2014-12-17,0.585000
2016-06-22,1.175000