f/overrides/event-backup/nbiax-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
2002-06-24,0.040000
2004-11-19,0.032000
2010-03-26,0.039000
2026-06-26,0.554000
2007-06-28,0.347000
1997-12-29,0.370000
2000-11-16,0.312000
2001-06-25,0.070000
2002-12-27,0.107000
2012-12-21,0.352000
2013-06-26,0.108000
2017-03-28,0.017000
2017-12-21,0.575000
2001-09-25,0.080000
2008-03-28,0.040000
2010-09-28,0.039000
2011-06-24,0.037000
2022-09-28,0.023000
1997-09-25,0.075000
2009-06-24,0.062000
2009-09-28,0.044000
2019-03-27,0.032000
2000-12-22,0.153000
2013-12-23,0.269000
2014-03-28,0.029000
2018-03-27,0.027000
2001-12-26,0.106000
2004-03-29,0.014000
2004-09-28,0.030000
2015-12-22,0.451000
2003-12-29,0.100000
2016-03-28,0.011000
2018-09-26,0.031000
1999-06-28,0.085000
2024-03-26,0.040000
2011-12-22,0.091000
2002-09-26,0.034000
2003-11-20,0.014000
2005-03-29,0.023000
2011-09-28,0.036000
2014-06-26,0.690000
2020-03-27,0.022000
2021-12-22,0.773000
2006-06-29,0.234000
2007-12-28,0.381000
2012-03-27,0.025000
2013-09-26,0.022000
2003-03-27,0.011000
2024-12-20,0.442000
2024-06-26,0.240000
2004-06-28,0.018000
2005-05-18,0.133000
2021-06-28,1.128000
2022-12-21,0.076000
1997-03-25,0.032000
1998-12-23,0.102000
2000-06-20,0.113000
2001-03-26,0.071000
2009-12-22,0.081000
2008-12-23,0.090000
2017-06-27,0.325000
1999-09-28,0.081000
2022-06-28,0.494000
2008-06-27,1.164000
2010-12-22,0.062000
2015-09-28,0.018000
2025-12-19,0.475000
2000-05-18,0.600000
2011-03-28,0.029000
2023-09-27,0.033000
2025-09-26,0.042000
2002-03-25,0.031000
2008-09-29,0.046000
2009-03-27,0.037000
2022-03-29,0.018000
1997-06-25,0.132000
1999-12-21,0.186000
2004-05-19,0.080000
2007-09-27,0.056000
2019-12-20,0.528000
1998-09-24,0.075000
2000-09-25,0.098000
2014-09-29,0.012000
2018-06-27,0.577000
1999-11-09,0.161000
2005-06-28,0.054000
2005-09-28,0.054000
2012-09-27,0.028000
2006-12-28,0.281000
2016-06-28,0.295000
2018-12-21,0.453000
2025-03-27,0.026000
2010-06-24,0.054000
2012-06-27,0.105000
2021-09-28,0.045000
2023-12-21,0.112000
2015-06-26,0.438000
2017-09-27,0.018000
2019-09-26,0.032000
2020-09-28,0.017000
1998-06-25,0.035000
2006-03-30,0.048000
2007-03-29,0.053000
2015-03-27,0.022000
2003-09-26,0.029000
2004-12-29,0.151000
2020-12-21,0.181000
2025-06-26,0.447000
2024-09-26,0.041000
2005-12-29,0.653000
2016-09-27,0.013000
2016-12-22,0.276000
2023-06-28,0.313000
2019-06-26,0.315000
1996-12-23,0.157000
2001-05-21,0.107000
2006-09-28,0.056000
2013-03-12,0.026000
2014-12-22,0.748000
2023-03-29,0.029000
2026-03-27,0.039000
2000-03-23,0.058000
2003-06-26,0.024000
2020-06-26,0.492000
2021-03-29,0.051000