f/overrides/event-backup/eww-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
2004-12-23,0.277000
2008-12-23,0.423000
2010-06-23,0.237000
2020-06-15,0.124000
1997-12-23,0.010000
2006-12-20,0.455000
2012-12-18,0.174000
2017-06-20,0.583000
2003-12-22,0.208000
2011-12-20,0.347000
2015-12-29,0.331000
2020-12-14,0.347000
2021-06-10,0.387000
2022-06-09,0.753000
2026-06-15,1.138000
2000-12-20,0.073000
2002-12-23,0.522000
2009-06-23,0.189000
2023-06-07,0.458000
2024-06-11,0.476000
2025-06-16,1.083000
1998-08-25,0.371000
1998-12-22,0.049000
2023-12-20,1.027000
2012-06-21,0.570000
2013-06-27,0.458000
2021-12-13,0.658000
2001-08-24,0.111000
2022-12-13,1.045000
1996-08-26,0.015000
2019-12-16,0.434000
2020-12-30,0.144000
2007-12-20,1.046000
2017-12-19,0.509000
2005-12-23,0.476000
2008-06-25,0.550000
2011-06-22,0.431000
2013-12-18,0.737000
2014-12-17,0.512000
2015-12-21,0.417000
2018-06-19,0.574000
1997-08-25,0.501000
2025-12-16,1.327000
2000-08-24,0.423000
2003-12-16,0.520000
2015-06-25,0.416000
2018-12-18,0.372000
2024-12-17,1.580000
2001-12-24,0.070000
2009-12-22,0.515000
2010-12-21,0.284000
2013-12-27,0.136000
2016-06-22,0.579000
2019-06-17,0.882000
2010-12-29,0.019000
1999-08-25,0.088000
2014-06-25,0.220000
2016-12-21,0.199000