f/overrides/event-backup/migfx-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
1986-11-28,0.057000
1990-12-28,0.031000
1974-08-30,0.053000
1978-11-30,0.057000
1980-11-28,0.075000
1981-08-31,0.087000
1983-08-31,0.075000
1986-02-28,0.055000
1997-12-23,2.262000
1998-12-17,1.392000
1999-12-17,1.616000
2012-12-18,0.150000
2021-12-14,3.769000
1984-08-31,0.082000
1974-11-29,0.050000
1976-11-30,0.037000
1977-02-28,0.037000
1977-11-30,0.048000
1979-05-31,0.064000
1983-05-31,0.070000
1980-02-29,0.068000
1988-03-31,0.040000
2000-12-18,1.724000
2024-12-19,3.609000
1984-11-30,0.084000
1987-02-27,0.051000
1987-05-29,0.050000
2010-12-16,0.074000
2020-12-15,2.783000
2021-06-30,0.696000
2013-12-17,0.346000
1973-11-30,0.046000
1974-02-28,0.050000
1975-05-30,0.040000
1976-05-28,0.033000
1983-11-30,0.075000
1989-09-29,0.025000
2024-07-31,0.015000
2026-07-31,0.540000
1973-08-31,0.050000
1980-05-30,0.070000
1980-08-29,0.077000
1982-11-30,0.097000
1986-05-30,0.040000
2011-12-15,0.090000
1987-08-31,0.041000
2007-12-20,0.057000
2019-06-28,0.092000
1974-05-31,0.050000
1977-05-31,0.042000
1984-05-31,0.082000
1985-02-28,0.063000
2004-12-16,0.050000
2023-12-21,1.617000
1976-08-31,0.034000
1985-05-31,0.070000
1986-08-29,0.045000
2009-12-17,0.056000
2014-12-18,0.931000
2019-12-17,2.345000
2025-12-18,4.403000
1976-02-27,0.035000
1978-08-31,0.060000
1982-05-28,0.110000
1989-03-31,0.007000
1989-06-30,0.035000
1989-12-29,0.029000
1981-11-30,0.098000
1982-02-26,0.086000
1985-11-29,0.066000
2015-12-17,1.498000
2020-06-30,0.003000
1978-02-28,0.053000
1981-02-27,0.075000
1984-02-29,0.075000
1988-06-30,0.040000
1988-12-30,0.014000
2022-12-13,1.426000
1979-11-30,0.065000
1982-08-31,0.110000
1985-08-30,0.076000
1988-09-30,0.025000
1996-12-23,3.097000
2008-12-18,0.064000
1973-05-31,0.046000
1978-05-31,0.055000
1979-02-28,0.063000
1981-05-29,0.075000
1983-02-28,0.060000
1990-06-29,0.020000
2022-07-29,0.056000
2025-07-31,0.328000
1975-08-29,0.040000
1977-08-31,0.044000
1979-08-31,0.070000
1987-12-28,0.040000
2017-12-19,1.911000
2018-12-18,2.726000
1975-02-28,0.047000
1975-11-28,0.040000
2016-12-20,1.366000