f/overrides/event-backup/ipiix-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
1980-05-01,0.095000
1980-12-01,0.095000
2011-12-28,0.577000
2024-12-31,0.044000
2009-05-01,0.054000
2015-12-29,0.399000
2025-01-31,0.043000
1999-06-28,0.264000
2006-04-03,0.006000
2017-09-29,0.035000
2026-02-27,0.040000
1981-04-01,0.095000
1993-07-20,0.590000
2012-09-13,0.005000
2020-12-31,0.040000
2026-07-31,0.044000
2022-01-31,0.026000
2025-05-30,0.044000
2018-09-28,0.033000
2018-11-30,0.033000
2021-02-26,0.035000
2025-04-30,0.038000
2019-08-30,0.037000
2021-08-31,0.027000
2025-07-31,0.044000
2024-06-28,0.042000
2026-01-30,0.044000
1980-01-02,0.154000
2015-12-31,0.034000
1981-08-03,0.095000
1995-12-29,0.540000
2016-08-31,0.037000
2019-12-31,0.039000
1998-06-25,0.279000
2017-05-31,0.036000
1980-09-02,0.095000
1997-12-30,0.452000
2004-03-30,0.614000
2020-11-30,0.038000
2021-06-30,0.037000
2022-02-28,0.023000
1981-01-02,0.188000
2003-07-01,0.230000
2012-05-01,0.053000
2025-06-30,0.042000
1981-06-01,0.095000
1989-12-27,1.470000
2020-05-29,0.039000
2022-03-31,0.025000
2022-06-30,0.027000
1987-04-03,1.019000
2000-06-19,0.160000
2010-12-29,0.637000
2017-02-28,0.035000
1980-03-03,0.095000
1999-12-10,0.489000
1981-11-02,0.095000
2001-06-20,0.016000
2016-07-29,0.037000
2017-07-31,0.036000
2020-09-30,0.039000
2022-11-30,0.026000
2025-08-29,0.044000
2026-03-31,0.044000
1981-09-01,0.095000
2024-02-29,0.035000
1980-11-03,0.095000
2012-12-27,0.527000
2018-04-30,0.034000
2022-12-30,0.030000
2018-10-31,0.034000
2019-06-28,0.035000
1980-07-01,0.095000
1996-12-30,0.535000
2008-04-01,0.303000
2006-12-27,0.532000
1981-02-02,0.095000
2005-12-16,0.508000
2019-04-30,0.035000
2021-03-31,0.038000
2020-06-30,0.038000
2021-04-30,0.037000
2023-09-29,0.039000
1991-12-27,1.180000
2014-12-29,0.427000
2017-04-28,0.034000
2016-05-31,0.036000
2020-03-31,0.040000
2022-10-31,0.026000
2023-03-31,0.031000
1980-06-02,0.095000
1995-07-28,0.300000
2007-12-28,0.510000
2017-08-31,0.036000
2018-05-31,0.035000
2022-05-31,0.028000
2022-09-30,0.028000
2018-06-29,0.034000
2011-05-02,0.001000
2025-09-30,0.043000
2015-05-01,0.024000
2019-12-30,0.016000
2026-04-30,0.042000
2022-08-31,0.029000
1994-12-30,0.410000
2009-09-09,0.006000
2023-08-31,0.039000
1984-04-23,0.982000
1996-07-31,0.300000
2023-10-31,0.042000
1982-07-01,0.300000
2016-06-30,0.035000
2017-11-30,0.035000
2022-12-28,0.034000
2024-03-28,0.041000
2024-11-29,0.042000
2025-03-31,0.044000
2019-07-31,0.037000
2019-09-30,0.037000
2021-09-30,0.026000
2004-12-17,0.498000
2020-01-31,0.039000
2021-01-29,0.039000
2021-05-28,0.038000
2024-01-31,0.041000
2024-04-30,0.039000
1981-07-01,0.095000
1993-12-31,0.336000
2009-12-29,0.726000
2016-09-30,0.037000
2020-02-28,0.037000
1982-04-01,0.300000
2002-12-20,0.407000
2020-12-30,0.291000
2025-10-31,0.044000
2025-12-31,0.044000
1980-08-01,0.095000
1981-05-01,0.095000
2020-10-30,0.040000
2023-05-31,0.037000
2026-05-29,0.044000
1983-01-03,0.277000
2020-08-31,0.040000
2022-07-29,0.027000
2023-06-30,0.035000
2024-05-31,0.041000
1982-10-01,0.300000
1983-04-04,0.290000
1997-06-27,0.350000
2001-12-20,0.631000
2016-12-30,0.038000
2017-12-29,0.036000
2018-02-28,0.032000
2019-02-28,0.032000
1985-04-02,1.410000
2005-07-01,0.003000
2018-12-31,0.082000
1988-12-27,1.094000
1990-12-27,1.110000
2014-05-01,0.007000
2019-01-31,0.035000
2021-07-30,0.038000
2023-02-28,0.029000
1981-12-01,0.095000
1994-07-20,0.420000
2017-10-31,0.036000
2023-11-30,0.041000
1989-04-06,0.009000
2002-07-01,0.019000
2018-08-31,0.035000
2019-05-31,0.036000
2023-07-31,0.038000
2024-07-31,0.043000
2024-08-30,0.047000
2024-10-31,0.044000
2019-11-29,0.038000
2021-12-31,0.026000
2008-12-29,0.748000
2020-07-31,0.040000
2021-10-29,0.026000
1980-10-01,0.095000
2016-10-31,0.040000
2016-12-29,0.107000
2017-01-31,0.039000
2017-06-30,0.035000
2020-04-30,0.036000
2016-11-30,0.038000
2026-06-30,0.042000
2018-01-31,0.036000
1980-02-01,0.090000
1981-03-02,0.095000
1981-10-01,0.095000
1982-01-04,0.236000
1992-07-24,0.630000
2000-12-21,0.563000
2013-12-27,0.445000
2018-03-29,0.035000
2022-04-29,0.023000
2023-01-31,0.029000
2023-04-28,0.031000
1987-12-23,1.472000
2012-12-31,0.017000
2019-10-31,0.039000
2021-11-30,0.025000
2025-02-28,0.039000
1998-12-30,0.482000
2025-11-28,0.043000
1986-04-08,0.995000
1992-12-29,1.110000
2019-03-29,0.036000
2023-12-29,0.053000
1980-04-01,0.095000
2017-03-31,0.039000
1990-06-22,0.040000
2018-07-31,0.035000
2024-09-30,0.043000