f/overrides/event-backup/amecx-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
1990-04-06,0.200000
2011-12-23,0.204000
2015-06-17,0.165000
1988-04-04,0.200000
1991-12-27,0.250000
2000-12-15,0.680000
2002-06-14,0.200000
2002-12-13,0.196000
2005-09-23,0.165000
2008-12-24,0.237000
2012-12-20,0.185000
1986-04-01,0.200000
2023-09-11,0.170000
2016-03-16,0.165000
2018-03-14,0.165000
1992-03-27,0.200000
1999-12-13,1.080000
2002-10-28,0.085000
2007-06-22,0.195000
2009-06-19,0.165000
2013-06-14,0.165000
1986-10-10,0.200000
2004-03-26,0.175000
2006-03-24,0.175000
2025-12-15,2.087000
2001-12-14,0.356000
1996-06-21,0.200000
2001-06-15,0.200000
2011-06-17,0.165000
2017-09-13,0.165000
2024-09-16,0.170000
1990-12-28,0.280000
2007-09-21,0.195000
2014-06-13,0.165000
2015-03-13,0.165000
2018-12-18,1.079000
2020-06-15,0.165000
1994-09-23,0.200000
2018-06-13,0.165000
2021-03-15,0.165000
2022-06-13,0.165000
2007-03-23,0.195000
2009-03-20,0.195000
2011-09-16,0.165000
2014-09-19,0.165000
2019-06-12,0.165000
2023-03-13,0.170000
2008-03-20,0.195000
1993-06-25,0.200000
1997-03-21,0.200000
2005-06-24,0.165000
2017-03-15,0.165000
2024-12-16,1.048000
2025-03-10,0.170000
2026-06-15,0.170000
1992-09-25,0.200000
1988-07-01,0.200000
1988-12-09,0.200000
1992-12-29,0.240000
2000-06-16,0.200000
2010-12-23,0.253000
1987-07-01,0.280000
1998-09-18,0.200000
2003-03-14,0.175000
2004-09-24,0.155000
2011-03-18,0.165000
1989-12-07,0.200000
2001-09-19,0.200000
2004-08-31,0.053000
1998-03-20,0.200000
1997-11-17,1.480000
2003-12-12,0.175000
2025-09-15,0.170000
1995-09-22,0.200000
1996-09-20,0.200000
2006-12-22,0.809000
2020-03-16,0.165000
2020-12-15,0.257000
1986-07-01,0.280000
1999-09-17,0.200000
2001-03-14,0.200000
2010-06-18,0.165000
1999-03-19,0.200000
1996-03-22,0.200000
2006-06-23,0.185000
2013-09-13,0.165000
2015-09-16,0.165000
2022-03-14,0.165000
2024-06-10,0.170000
1994-06-24,0.200000
1988-10-07,0.200000
2008-09-19,0.195000
2022-12-13,1.086000
1986-01-03,0.200000
1991-06-21,0.200000
1994-03-25,0.200000
2007-12-21,1.173000
2010-03-19,0.165000
2019-09-11,0.165000
2023-06-12,0.170000
2024-03-11,0.170000
1990-06-29,0.200000
2003-09-12,0.175000
2020-09-14,0.165000
1993-12-29,0.230000
1998-06-19,0.200000
2003-06-13,0.175000
2009-09-18,0.165000
2012-03-16,0.165000
2012-09-14,0.165000
2014-03-14,0.165000
2019-12-17,0.753000
1989-10-13,0.200000
2014-12-22,0.294000
2015-12-21,0.535000
2016-09-14,0.165000
2025-06-09,0.170000
2026-03-16,0.170000
1987-10-09,0.200000
1997-09-19,0.200000
1997-12-26,0.220000
2008-06-20,0.195000
2019-03-13,0.165000
2021-09-13,0.165000
1993-09-24,0.200000
2010-09-17,0.165000
2004-07-30,0.053000
1991-09-27,0.200000
2004-12-23,0.148000
2006-09-22,0.185000
2013-12-20,0.165000
2017-06-14,0.165000
2017-12-19,0.666000
2023-12-12,0.347000
1987-01-02,0.200000
2000-09-15,0.200000
2005-12-23,0.412000
2012-06-15,0.165000
2000-03-14,0.200000
1993-03-26,0.200000
1996-12-26,1.110000
1999-06-18,0.200000
2021-06-14,0.165000
1989-04-07,0.200000
1992-06-29,0.200000
1995-12-26,0.230000
1997-06-20,0.200000
2005-03-24,0.155000
2021-12-14,1.229000
1987-04-01,0.200000
2009-12-23,0.165000
2016-12-20,0.175000
2002-09-13,0.200000
1989-07-07,0.280000
1990-09-28,0.200000
1991-03-22,0.200000
1995-03-24,0.200000
2013-03-15,0.165000
2018-09-12,0.165000
1987-12-24,0.200000
1998-12-21,1.470000
2002-03-15,0.200000
1994-12-28,0.230000
2016-06-15,0.165000
2022-09-12,0.165000
1995-06-23,0.200000