f/overrides/event-backup/imrfx-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
1985-09-03,0.045000
1987-11-30,0.030000
1992-09-28,0.053000
1998-03-27,0.082000
2003-12-19,0.035000
2004-06-23,0.022000
1986-03-03,0.038000
1988-03-01,0.013000
1989-12-27,0.779000
2004-12-22,0.036000
2008-03-27,0.043000
2001-03-27,0.057000
1986-12-01,0.307000
1994-03-30,0.033000
1995-12-28,0.582000
1996-12-27,1.565000
1999-03-25,0.061000
2007-03-26,0.053000
2013-03-22,0.016000
1999-06-24,0.058000
1999-09-23,0.072000
2006-03-29,0.032000
2010-12-16,0.080000
1992-06-29,0.055000
2000-06-22,0.060000
2001-06-27,0.052000
2003-03-21,0.042000
2010-06-21,0.065000
2022-12-19,0.751000
1989-03-01,0.015000
1992-03-30,0.043000
2005-12-22,0.031000
2013-12-20,0.043000
1993-03-29,0.040000
2000-12-20,0.789000
2011-09-23,0.042000
2011-03-24,0.071000
1988-06-01,0.038000
1997-12-29,1.633000
2005-03-28,0.032000
2009-03-25,0.012000
1992-12-29,0.858000
2002-06-21,0.035000
2006-09-27,0.052000
2006-12-20,0.052000
1987-12-18,0.015000
1995-09-28,0.043000
1986-06-02,0.043000
1994-06-29,0.035000
2005-09-28,0.040000
2009-09-24,0.027000
1985-03-29,0.038000
1996-03-29,0.073000
1987-06-01,0.030000
1987-12-01,0.030000
1991-03-22,0.040000
2004-03-23,0.032000
2021-12-20,1.212000
1999-12-22,0.881000
2003-09-19,0.032000
2007-06-25,0.063000
1986-09-02,0.048000
1987-12-17,0.015000
1998-09-25,0.106000
2000-09-22,0.062000
1993-09-27,0.040000
1995-06-28,0.038000
1996-06-28,0.077000
2002-10-25,0.014000
2007-12-17,0.741000
2008-06-26,0.061000
1991-09-20,0.058000
1998-06-26,0.102000
2007-09-24,0.058000
2009-12-17,0.027000
1989-05-31,0.093000
1989-09-28,0.030000
2002-03-21,0.042000
2002-09-20,0.039000
2012-09-25,0.077000
1995-03-30,0.048000
1997-09-26,0.080000
2013-06-24,0.022000
1985-06-03,0.045000
1990-12-21,0.440000
2004-09-23,0.029000
2018-12-18,0.045000
1985-03-01,0.008000
2003-06-20,0.037000
2009-06-24,0.027000
2024-12-18,0.063000
1988-09-01,0.040000
1988-11-30,0.051000
1990-09-21,0.048000
1993-12-29,0.926000
2000-03-24,0.050000
2002-12-20,0.030000
2011-12-16,0.072000
1988-12-16,0.020000
1989-07-28,0.038000
1993-06-28,0.053000
1997-03-27,0.076000
2006-06-27,0.042000
2008-12-17,0.331000
2019-12-18,0.253000
1990-06-22,0.058000
1994-12-29,0.835000
2005-06-28,0.037000
2010-03-22,0.042000
2014-03-21,0.021000
2016-12-19,0.322000
1994-09-29,0.033000
2012-06-25,0.052000
2013-09-24,0.064000
2014-06-24,0.038000
2025-12-17,2.370000
1988-12-01,0.051000
1991-06-21,0.040000
1990-03-23,0.040000
1998-12-22,1.140000
2001-09-27,0.047000
2004-02-27,0.030000
2008-09-25,0.063000
2012-03-23,0.037000
1991-12-20,1.274000
2011-06-23,0.072000
2012-12-21,0.093000
1987-03-02,0.030000
2020-12-17,0.685000
1985-12-02,0.066000
1987-09-01,0.038000
1996-09-27,0.074000
1997-06-27,0.085000
2001-12-20,0.049000
2010-09-22,0.065000