f/overrides/event-backup/iwb-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
2018-09-26,0.740000
2020-06-15,0.600000
2013-09-24,0.404000
2015-09-25,0.489000
2003-12-16,0.210000
2008-03-24,0.323000
2021-09-24,0.837000
2003-12-12,0.294000
2012-06-26,0.363000
2004-09-24,0.245000
2008-09-24,0.299000
2015-12-29,0.082000
2016-03-23,0.566000
2023-12-20,0.976000
2025-03-18,0.829000
2007-03-23,0.324000
2017-03-24,0.561000
2019-06-17,0.874000
2019-09-24,0.722000
2021-03-25,0.717000
2023-09-26,1.006000
2009-12-23,0.318000
2014-12-24,0.592000
2016-12-22,0.679000
2018-03-22,0.630000
2022-09-26,0.969000
2022-03-24,0.769000
2009-07-02,0.291000
2003-03-07,0.157000
2001-03-09,0.159000
2005-12-22,0.342000
2014-07-02,0.495000
2000-09-20,0.184000
2010-03-24,0.243000
2010-07-02,0.296000
2013-07-02,0.432000
2006-03-24,0.266000
2020-03-25,0.744000
2022-06-09,0.624000
2024-09-25,1.068000
2025-06-16,0.838000
2025-09-16,0.962000
2007-06-28,0.315000
2015-07-02,0.576000
2015-12-24,0.585000
2001-06-08,0.157000
2022-12-13,0.927000
2002-09-13,0.155000
2000-12-13,0.203000
2004-06-25,0.279000
2011-03-24,0.290000
2002-03-08,0.155000
2011-07-05,0.334000
2017-07-06,0.630000
2013-12-23,0.503000
2006-06-22,0.285000
2005-09-23,0.319000
2006-12-20,0.342000
2024-03-21,0.869000
2024-06-11,0.733000
2026-06-15,0.843000
2005-03-24,0.463000
2012-03-23,0.322000
2017-09-26,0.602000
2024-12-17,1.015000
2005-06-20,0.177000
2010-09-23,0.286000
2023-03-23,0.826000
2002-12-13,0.240000
2018-12-17,0.812000
2019-12-16,0.836000
2008-07-02,0.329000
2012-09-24,0.403000
2026-03-17,0.865000
2002-06-14,0.170000
2004-12-23,0.400000
2006-09-26,0.315000
2012-12-19,0.539000
2014-09-24,0.436000
2000-06-21,0.062000
2023-06-07,0.633000
2025-12-16,1.100000
2017-12-21,0.642000
2007-12-27,0.355000
2021-06-10,0.545000
2008-12-23,0.266000
2011-09-23,0.307000
2011-12-22,0.410000
2016-07-06,0.642000
2019-03-20,0.627000
2003-06-13,0.188000
2003-09-12,0.206000
2004-03-26,0.201000
2013-03-25,0.391000
2016-09-26,0.463000
2001-12-14,0.156000
2018-07-03,0.680000
2020-09-23,0.765000
2020-12-14,0.790000
2021-12-13,0.780000
2001-10-01,0.221000
2009-09-22,0.242000
2007-09-25,0.341000
2010-12-22,0.338000
2014-03-25,0.432000
2015-03-25,0.481000
2009-03-24,0.338000