f/overrides/event-backup/nicsx-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
2013-06-05,0.982000
1980-04-18,0.389000
1982-04-16,0.615000
1983-04-15,0.638000
1991-05-17,0.423000
2002-04-25,0.043000
1988-04-26,0.572000
1993-05-21,0.640000
2006-12-26,4.034000
1996-12-27,2.983000
2009-06-08,0.068000
2020-06-03,1.535000
2021-12-29,4.692000
2022-06-08,1.249000
1994-12-23,1.900000
2010-06-08,1.674000
2014-12-29,2.804000
2024-06-06,3.913000
2026-06-05,0.030000
1997-12-29,4.957000
2006-06-07,1.114000
2000-06-19,15.540000
2001-12-26,0.116000
2004-12-29,0.455000
2016-12-28,1.498000
2021-06-02,5.545000
1988-12-28,0.904000
2011-12-28,1.796000
2003-12-29,0.060000
2007-06-07,3.634000
2010-04-30,0.061000
1989-05-19,0.438000
1989-12-29,1.540000
1994-05-13,2.124000
1996-05-17,2.752000
1998-05-15,2.606000
2017-06-07,5.353000
2019-12-27,3.643000
2023-12-27,3.053000
2012-12-26,1.757000
2018-12-27,2.948000
1986-04-25,1.069000
1991-12-31,1.080000
1992-12-24,1.345000
1995-12-22,3.278000
2004-06-09,0.023000
2017-12-27,4.255000
1985-04-26,0.575000
2008-12-29,0.100000
2009-12-28,0.026000
2011-06-08,1.740000
2015-06-04,2.350000
1981-04-16,0.522000
1987-12-11,2.355000
1997-05-16,1.205000
2019-08-07,0.070000
2018-06-06,1.565000
2019-06-05,1.936000
1992-05-15,1.376000
1995-05-12,1.381000
2002-12-27,0.159000
2010-12-28,2.102000
2015-12-29,1.534000
1999-12-22,1.459000
2000-12-22,3.900000
2005-06-08,1.743000
2014-06-04,3.058000
2020-12-29,3.676000
1984-04-19,0.642000
1998-12-29,6.254000
2024-12-27,3.699000
2012-06-07,0.870000
2013-12-27,2.115000
2022-12-28,0.318000
1990-05-18,0.363000
2001-06-19,0.120000
2005-12-29,3.827000
2007-12-26,6.545000
2008-06-05,4.681000
2023-06-07,2.846000
2025-12-29,3.373000
2016-06-09,0.717000
2025-06-05,4.831000
1987-04-27,3.519000
1990-12-27,0.652000
1993-12-23,1.225000
1999-05-20,4.795000
2003-06-10,0.031000