f/overrides/event-backup/mtrax-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
2021-06-30,0.044000
2022-08-31,0.039000
2024-02-29,0.048000
2025-03-31,0.056000
2002-06-28,0.067000
2002-09-30,0.067000
2006-03-28,0.059000
2017-03-31,0.053000
2018-12-20,0.367000
2021-05-28,0.047000
2022-01-31,0.022000
2003-06-30,0.051000
2007-09-26,0.091000
2011-12-13,0.150000
2018-02-28,0.040000
2025-02-28,0.067000
1999-09-30,0.083000
2007-12-12,0.078000
2018-06-29,0.055000
2020-02-28,0.038000
2015-09-30,0.147000
2017-05-31,0.070000
2024-03-28,0.059000
2026-02-27,0.054000
1997-09-30,0.103000
2000-09-29,0.100000
2009-12-16,0.093000
2013-09-27,0.162000
2019-06-28,0.048000
2019-07-31,0.041000
2020-11-30,0.035000
2022-03-31,0.039000
1996-03-29,0.082000
2003-12-18,0.050000
2004-12-13,0.333000
2017-06-30,0.054000
2022-11-30,0.053000
2025-01-31,0.047000
2025-05-30,0.078000
2016-06-30,0.166000
2016-12-13,0.145000
2018-07-31,0.028000
2020-09-30,0.034000
2005-09-30,0.041000
2019-01-31,0.041000
1998-06-30,0.090000
1998-09-30,0.099000
2000-12-19,3.572000
2005-03-31,0.051000
2023-07-31,0.032000
2024-05-31,0.057000
1995-03-31,0.114000
1995-09-29,0.100000
2002-12-19,0.084000
2020-12-17,0.038000
2007-06-27,0.081000
2014-09-29,0.152000
2017-09-29,0.032000
2019-05-31,0.091000
1997-12-19,1.945000
2001-09-28,0.091000
2004-03-31,0.024000
2005-12-15,0.060000
2023-02-28,0.048000
2024-10-31,0.029000
2026-06-30,0.059000
1999-03-31,0.082000
1999-06-30,0.087000
2018-05-31,0.076000
2015-12-10,0.752000
2019-08-30,0.042000
2021-01-29,0.051000
2022-07-29,0.021000
1997-06-30,0.092000
2008-12-15,0.096000
2009-09-25,0.100000
2011-03-30,0.142000
2025-09-30,0.015000
2025-11-28,0.018000
2023-03-31,0.054000
2023-04-28,0.041000
2023-06-30,0.042000
2025-07-31,0.034000
2017-08-31,0.043000
2024-06-28,0.063000
1995-06-30,0.117000
1996-09-30,0.094000
2001-12-18,0.307000
2016-09-30,0.129000
2003-03-31,0.059000
2025-06-30,0.058000
2019-10-31,0.026000
2023-11-30,0.037000
2024-01-31,0.040000
2024-04-30,0.062000
2004-12-16,0.058000
2005-06-30,0.056000
2007-03-28,0.097000
2010-12-20,0.105000
2024-09-30,0.046000
2017-02-28,0.031000
2017-10-31,0.026000
2018-10-31,0.024000
2019-12-19,0.800000
2001-03-30,0.092000
2001-06-29,0.084000
2004-09-30,0.048000
2016-03-31,0.148000
2018-08-31,0.043000
2019-02-28,0.045000
2021-12-16,1.185000
2025-08-29,0.049000
1998-03-31,0.100000
2009-06-26,0.077000
2022-10-31,0.024000
2017-07-31,0.032000
2017-12-21,0.541000
2026-04-30,0.064000
1998-12-22,1.871000
2006-09-26,0.085000
2010-06-29,0.205000
2013-12-06,0.699000
2012-06-28,0.213000
2014-06-27,0.222000
2019-09-30,0.041000
2021-09-30,0.038000
2025-10-31,0.042000
2004-06-30,0.044000
2013-03-28,0.165000
2024-07-31,0.032000
2025-04-30,0.051000
2026-01-30,0.084000
2006-12-12,1.601000
2014-12-08,1.056000
2022-04-29,0.030000
2022-05-31,0.069000
2005-12-08,0.768000
2013-06-27,0.210000
2015-06-30,0.203000
2022-09-30,0.034000
2017-11-30,0.050000
2021-07-30,0.027000
2021-11-30,0.031000
2022-12-21,0.031000
2011-06-29,0.217000
2012-12-05,0.154000
2015-03-31,0.155000
2017-01-31,0.026000
2023-10-31,0.026000
2024-12-18,0.069000
2018-04-30,0.047000
2021-02-26,0.069000
2026-03-31,0.059000
1995-12-29,0.092000
2008-06-25,0.082000
2014-03-28,0.165000
2017-04-28,0.038000
2020-04-30,0.019000
2020-07-31,0.027000
2021-03-31,0.071000
2023-08-31,0.043000
1996-06-28,0.093000
1999-12-21,1.510000
2000-03-31,0.091000
2003-09-30,0.042000
2000-06-30,0.089000
2020-06-30,0.039000
2022-02-28,0.036000
2002-03-28,0.068000
2006-06-27,0.064000
2023-05-31,0.073000
2026-07-31,0.045000
2020-01-31,0.028000
2023-09-29,0.038000
2024-11-29,0.056000
1997-03-31,0.098000
2006-12-14,0.084000
2018-11-30,0.050000
2019-11-29,0.045000
2019-03-29,0.054000
2020-05-29,0.041000
2022-06-30,0.042000
2024-08-30,0.053000
2007-12-07,2.270000
2008-03-26,0.083000
2010-03-30,0.131000
2011-09-29,0.160000
2025-12-18,0.043000
2026-05-29,0.087000
2009-03-27,0.080000
2012-03-30,0.146000
2018-01-31,0.028000
2021-10-29,0.016000
2018-09-28,0.039000
2020-03-31,0.046000
2021-04-30,0.043000
2023-01-31,0.024000
1996-12-27,0.610000
2009-10-26,0.025000
2010-09-29,0.176000
2018-03-29,0.042000
2023-12-21,0.079000
2020-10-30,0.035000
2021-08-31,0.031000
2008-09-24,0.072000
2012-09-27,0.161000
2019-04-30,0.038000
2020-08-31,0.036000