f/overrides/event-backup/acstx-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
2006-09-13,0.095000
2007-09-12,0.090000
2011-12-09,0.053000
2019-06-20,0.109000
1996-12-31,2.190000
2002-12-11,0.042000
2001-12-12,0.736000
1983-04-04,0.540000
1989-12-15,0.540000
2017-06-15,0.100000
2022-09-22,0.133000
2025-09-25,0.121000
2002-05-31,0.055000
2016-03-17,0.100000
2006-06-14,0.095000
2009-03-11,0.063000
2012-12-07,0.070000
2016-06-16,0.100000
2023-03-23,0.120000
2026-03-26,0.121000
1977-05-16,0.160000
1995-03-15,0.068000
2018-03-22,0.083000
1981-05-01,0.510000
1993-12-15,0.095000
1993-06-15,0.068000
1997-06-23,0.063000
1999-09-20,0.063000
2012-09-20,0.066000
1980-05-01,0.430000
1985-04-01,0.550000
2015-09-17,0.079000
2020-03-19,0.101000
2025-06-26,0.116000
1988-09-15,0.015000
2001-09-19,0.054000
2008-06-11,0.080000
2020-09-17,0.119000
2002-11-29,0.055000
2005-09-14,0.083000
2005-03-16,0.078000
2008-03-12,0.243000
2013-09-19,0.070000
2018-12-14,1.894000
2020-06-18,0.104000
1996-03-15,0.068000
2003-03-19,0.042000
2011-09-15,0.053000
2014-09-18,0.080000
1998-12-09,2.038000
1999-03-22,0.484000
1998-03-23,0.790000
2003-01-31,0.051000
2010-12-03,0.053000
2015-03-19,0.079000
2015-12-11,2.068000
2018-06-21,0.083000
1974-04-15,0.080000
1997-03-31,0.517000
2024-09-26,0.115000
2002-06-19,0.042000
2005-06-15,0.083000
2002-09-18,0.042000
2013-03-21,0.070000
2020-12-11,0.172000
1987-04-01,0.373000
1995-12-15,0.068000
2000-03-22,0.649000
1976-04-26,0.100000
1994-06-15,0.068000
2025-12-11,2.351000
1984-04-02,0.460000
2004-03-17,0.048000
2024-03-28,0.117000
1993-09-15,0.068000
2006-03-15,0.572000
2021-03-25,0.105000
1975-05-12,0.100000
1996-06-28,0.063000
1999-12-13,1.329000
2005-12-14,1.237000
2011-06-16,0.053000
2017-12-13,0.669000
2018-09-13,0.098000
2021-06-24,0.105000
1991-12-16,0.388000
1995-09-15,0.068000
1998-09-21,0.063000
2012-06-14,0.066000
2000-06-21,0.063000
2003-09-17,0.048000
2022-06-23,0.133000
1988-12-15,0.350000
1991-04-01,0.008000
2008-12-10,0.073000
2014-03-20,0.070000
2026-06-25,0.120000
2003-02-28,0.051000
2006-12-13,0.566000
1992-04-01,0.008000
1993-03-15,0.068000
1996-06-14,0.063000
2001-03-21,0.369000
2001-06-20,0.063000
2010-09-16,0.053000
1978-05-30,0.010000
1990-12-14,0.458000
2021-09-23,0.105000
2016-12-13,1.551000
2017-03-16,0.100000
2022-12-14,3.071000
2025-03-27,0.116000
2009-09-09,0.032000
2010-04-16,0.012000
1982-05-03,0.630000
2019-03-21,0.098000
2000-12-13,1.191000
2003-06-18,0.048000
2004-06-16,0.058000
1994-03-15,0.068000
1999-06-21,0.063000
2014-12-12,0.185000
2019-09-19,0.123000
2019-12-13,1.527000
2023-06-22,0.120000
2013-12-13,0.070000
2014-06-19,0.070000
2004-12-08,0.058000
2012-03-15,0.060000
1994-12-15,0.120000
1997-09-22,0.063000
2004-09-15,0.058000
2007-12-11,1.045000
2010-03-10,0.052000
2013-06-20,0.070000
2016-09-15,0.100000
1997-12-22,2.181000
1998-06-22,0.063000
1992-12-15,0.320000
1994-09-15,0.068000
2002-04-30,0.055000
2007-03-14,0.219000
2009-06-10,0.053000
2022-03-24,0.105000
1979-05-01,0.300000
1986-04-02,0.383000
2023-09-28,0.118000
2002-03-20,0.186000
2009-12-09,0.032000
2017-09-14,0.100000
1977-12-27,0.210000
1987-12-31,0.373000
2008-09-10,0.073000
2011-03-17,0.053000
2015-06-18,0.079000
2021-12-14,2.252000
2024-06-27,0.117000
2003-12-10,0.048000
2007-06-13,0.090000
1996-09-30,0.063000
2000-09-20,0.063000
2010-06-09,0.052000
2023-12-13,1.950000
2024-12-12,2.560000
1990-04-02,0.018000
1995-06-15,0.068000