f/overrides/event-backup/dfivx-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
1994-09-08,0.036000
1998-12-21,0.113000
2006-12-13,0.336000
2006-12-18,0.459000
2016-09-29,0.056000
2021-12-15,0.424000
1998-06-09,0.099000
2007-06-08,0.403000
2013-12-12,0.108000
2014-12-16,0.134000
2011-12-13,0.148000
2024-06-27,0.339000
1996-06-10,0.095000
1996-09-10,0.056000
1998-03-10,0.003000
2002-09-10,0.051000
2006-06-08,0.276000
1994-06-08,0.055000
2004-06-08,0.144000
2014-03-10,0.315000
2015-09-09,0.075000
2019-12-17,0.189000
2022-03-30,0.020000
1995-06-08,0.097000
1995-09-08,0.045000
1997-09-09,0.062000
2005-11-14,0.002000
2009-06-09,0.220000
2021-06-29,0.268000
1997-12-22,0.213000
2007-03-08,0.014000
2014-06-09,0.325000
2019-03-28,0.037000
2023-12-13,0.288000
1995-12-27,0.012000
2003-09-09,0.041000
2018-03-28,0.038000
2000-06-08,0.104000
2008-12-10,0.086000
2009-12-09,0.087000
2026-03-30,0.046000
2004-09-08,0.078000
2026-06-29,0.360000
1994-12-28,0.008000
1999-09-08,0.071000
2002-06-10,0.107000
2003-12-22,0.079000
2012-03-08,0.031000
2001-12-17,0.397000
2005-06-08,0.210000
2006-09-08,0.237000
2012-09-10,0.075000
2013-03-08,0.030000
2017-09-28,0.098000
2018-09-27,0.078000
1995-11-27,0.048000
2020-09-29,0.086000
2005-09-08,0.080000
2017-03-30,0.054000
2022-06-29,0.330000
2001-09-10,0.054000
2003-03-10,0.012000
2004-12-20,0.139000
2009-11-11,0.257000
2019-09-27,0.088000
2023-06-29,0.388000
2024-09-27,0.228000
2005-12-19,0.476000
2024-12-13,0.204000
1994-11-28,0.036000
2021-09-29,0.147000
2025-12-15,0.564000
1997-06-10,0.089000
2000-12-18,0.824000
2005-10-26,0.236000
2018-12-18,0.622000
2023-09-28,0.165000
2014-09-09,0.089000
2007-09-10,0.129000
2000-09-08,0.062000
2007-12-12,0.338000
2010-12-09,0.101000
2015-06-08,0.341000
2020-06-29,0.169000
2011-03-08,0.055000
2013-09-10,0.073000
2017-06-29,0.273000
2022-09-29,0.140000
2024-03-27,0.041000
2025-09-29,0.227000
1996-12-27,0.341000
2002-12-16,0.044000
2016-03-30,0.070000
2019-06-27,0.342000
2023-03-30,0.040000
2025-06-27,0.366000
2020-12-16,0.155000
2003-06-10,0.136000
2005-03-08,0.009000
2007-12-19,0.615000
2009-03-10,0.019000
2010-06-08,0.215000
2012-12-13,0.141000
2017-12-15,0.159000
1995-03-08,0.008000
1999-06-08,0.144000
2001-06-08,0.145000
2018-06-28,0.313000
1996-03-08,0.012000
2012-06-08,0.271000
2016-06-29,0.278000
2015-12-16,0.137000
1998-09-09,0.059000
1999-12-20,0.226000
2008-03-10,0.024000
2008-09-09,0.111000
2008-12-17,0.179000
2010-09-08,0.067000
2013-06-10,0.327000
2016-12-15,0.160000
2022-12-14,0.182000
2000-03-08,0.014000
2004-03-09,0.004000
2008-06-10,0.524000
2010-03-09,0.014000
2011-06-08,0.311000
2021-03-30,0.021000
1997-03-10,0.007000
2009-09-09,0.071000
2011-09-08,0.099000
2025-03-28,0.047000