f/overrides/event-backup/amcpx-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
1999-12-09,1.725000
2006-12-21,0.569000
1986-03-14,0.190000
1988-12-16,0.190000
1991-12-03,0.120000
1997-11-28,1.490000
2000-12-07,1.315000
2013-06-14,0.527000
2021-12-15,1.171000
2023-06-14,0.093000
2025-06-11,1.868000
1996-11-29,0.900000
2002-12-05,0.024000
1987-03-20,0.180000
1994-11-18,0.080000
1996-05-17,0.050000
2016-12-19,0.520000
2017-12-18,1.263000
2020-12-16,0.934000
2025-12-12,2.151000
1992-11-20,0.110000
2003-06-20,0.003000
2008-06-20,0.704000
2009-06-19,0.164000
2004-12-02,0.169000
2014-06-13,0.916000
2017-06-16,0.429000
2023-12-13,1.150000
1998-06-19,0.480000
2002-06-21,0.096000
2005-12-21,0.255000
2019-12-19,1.467000
1987-12-21,0.120000
1989-12-15,0.240000
1995-12-01,0.120000
1999-06-18,0.850000
2011-06-17,0.072000
2016-06-17,0.517000
2018-06-15,0.853000
2026-06-16,3.537000
1992-05-22,0.040000
1994-05-20,0.050000
2010-06-18,0.080000
2018-12-20,2.186000
2019-06-14,0.177000
1989-03-17,0.030000
1993-05-21,0.050000
1995-05-12,0.050000
2014-12-22,1.696000
2015-06-19,0.960000
2021-06-16,1.529000
2001-06-22,0.565000
2013-12-20,1.703000
2020-06-17,0.582000
2022-06-15,2.267000
1998-12-10,1.940000
2001-12-06,0.225000
2007-12-14,1.218000
1993-11-19,0.070000
2015-12-18,1.339000
1990-03-16,0.050000
1997-05-23,1.080000
2000-06-23,1.046000
2007-06-15,0.136000
2024-06-12,0.811000
1988-03-18,0.100000
1990-12-04,0.200000
1991-03-15,0.030000
2005-06-17,0.222000
2006-06-16,0.167000
2012-06-15,0.084000
2024-12-17,2.687000