f/overrides/event-backup/nefox-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
1981-03-18,0.080000
1981-12-18,0.080000
1987-12-15,0.120000
1991-09-19,0.080000
1989-03-28,0.080000
1990-09-11,0.080000
2000-08-28,0.456000
2006-06-12,0.033000
1981-05-29,0.090000
1988-05-25,0.080000
1997-09-15,2.720000
1984-12-14,0.070000
1997-12-23,0.210000
2014-12-29,2.653000
2025-12-30,1.754000
1987-05-22,0.100000
1990-12-31,0.080000
1992-12-22,0.045000
1995-12-21,0.034000
1982-09-17,0.080000
1986-03-14,0.080000
1996-09-13,2.160000
2014-04-08,0.529000
1990-06-26,0.080000
2022-04-07,0.359000
2022-12-29,3.305000
1995-06-23,0.055000
1982-03-10,0.080000
1985-09-13,0.080000
1988-09-16,0.080000
1989-12-29,0.090000
1992-03-19,0.060000
1992-09-24,0.060000
1991-03-21,0.080000
1991-12-31,0.015000
1997-06-23,0.032000
1994-12-21,0.030000
1996-09-23,0.036000
1998-12-23,0.084000
2011-12-28,0.084000
1999-06-21,0.055000
2008-04-14,0.001000
1983-05-27,0.070000
1984-03-14,0.070000
1985-05-29,0.080000
1996-06-21,0.033000
1996-12-20,0.460000
2015-12-29,0.694000
2016-04-07,0.427000
1980-09-19,0.070000
1983-03-09,0.080000
1983-09-16,0.050000
1993-09-23,0.060000
1997-03-25,0.030000
2002-10-31,0.049000
1999-09-14,0.336000
2018-12-28,1.686000
2019-04-10,1.050000
2023-12-28,0.987000
2008-12-19,0.131000
2025-04-10,0.497000
1984-05-25,0.070000
1986-12-15,0.080000
1988-12-28,0.100000
1993-06-24,0.060000
2005-06-13,0.015000
1980-03-17,0.080000
1980-06-10,0.080000
1986-09-15,0.080000
1999-12-13,2.323000
1987-09-15,0.080000
2010-12-27,0.042000
2015-04-08,0.060000
1982-05-28,0.090000
2012-12-26,0.130000
2018-04-10,0.420000
1995-09-22,0.033000
1996-03-22,0.035000
1998-09-15,2.030000
2009-04-14,0.006000
2009-12-17,0.042000
2026-04-08,1.308000
1984-09-27,0.070000
1987-03-16,0.080000
2013-12-27,0.772000
2011-04-12,0.004000
2017-12-28,0.728000
1982-12-17,0.080000
1989-06-27,0.080000
1991-06-20,0.080000
1992-06-18,0.060000
2002-06-28,0.051000
1980-12-12,0.070000
1994-06-24,0.060000
2010-04-30,0.054000
2024-04-10,0.170000
1981-09-18,0.070000
1988-03-18,0.080000
2024-12-30,1.851000
1985-12-16,0.080000
1993-03-25,0.060000
2020-12-30,2.103000
1983-12-16,0.060000
2017-04-07,0.307000
2020-04-08,0.033000
2021-04-08,0.071000
1986-05-22,0.100000
2021-12-30,1.966000
1985-03-15,0.070000
1989-09-26,0.080000
1990-03-27,0.080000
2007-06-11,0.045000
2007-12-21,0.045000
1994-09-26,0.060000
2016-12-28,0.354000
2019-12-30,1.049000
1993-12-22,0.040000
1994-03-25,0.060000
1995-03-24,0.055000