f/overrides/event-backup/cosix-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

445 lines
8.7 KiB
Plaintext

Date,Dividends
1994-07-29,0.196000
1998-03-31,0.192000
2003-01-21,0.124000
2025-09-24,0.091000
2011-08-22,0.100000
1993-03-12,0.212000
1997-02-28,0.192000
2006-06-21,0.120000
2010-03-22,0.084000
2024-07-25,0.094000
1990-03-16,0.720000
1991-06-17,0.680000
1994-05-31,0.196000
1995-02-28,0.196000
2012-04-25,0.088000
2012-05-24,0.088000
2018-10-25,0.072000
1989-12-15,0.720000
1990-09-14,0.720000
1999-11-22,0.192000
2006-05-22,0.120000
2015-07-24,0.080000
2019-06-24,0.076000
1987-11-16,0.400000
1994-10-31,0.196000
1994-11-30,0.196000
2003-06-23,0.124000
2014-07-25,0.072000
2016-07-25,0.056000
1994-01-31,0.200000
2002-03-21,0.152000
2014-05-23,0.072000
2016-02-24,0.064000
1993-09-30,0.212000
1994-04-29,0.200000
1996-08-30,0.192000
2005-03-21,0.128000
2006-12-21,0.120000
2015-02-25,0.072000
2003-04-21,0.124000
2005-12-21,0.456000
2010-07-21,0.084000
2014-12-17,0.564000
1993-02-11,0.212000
1995-11-07,0.192000
2012-06-25,0.088000
2000-03-21,0.192000
2001-08-21,0.184000
1998-10-20,0.192000
2001-03-21,0.192000
2001-04-20,0.192000
2002-09-20,0.144000
2011-05-23,0.100000
2021-05-24,0.063000
1986-08-15,0.120000
2002-05-21,0.152000
2003-07-21,0.124000
2004-07-21,0.128000
2014-03-25,0.072000
2014-11-25,0.072000
2023-01-25,0.083000
2010-08-23,0.120000
2017-05-24,0.052000
2000-04-24,0.192000
2007-01-22,0.120000
2023-05-24,0.087000
1993-05-28,0.212000
1995-09-08,0.192000
1998-05-29,0.192000
2021-07-26,0.063000
2024-06-24,0.096000
2007-04-23,0.120000
2008-01-22,0.120000
2011-04-21,0.100000
2011-12-21,0.204000
2007-05-21,0.120000
2010-11-22,0.120000
2015-11-23,0.084000
2019-04-25,0.076000
2021-09-24,0.056000
2021-11-22,0.055000
2003-08-21,0.124000
2019-03-25,0.076000
2023-04-24,0.087000
1992-08-13,0.224000
1995-05-05,0.196000
1996-03-07,0.192000
1997-03-31,0.192000
2008-02-21,0.120000
2022-09-26,0.070000
1998-11-23,0.192000
2009-11-23,0.084000
1986-05-15,0.240000
1987-08-14,0.240000
1998-04-30,0.192000
2003-03-21,0.124000
2025-11-21,0.091000
2010-05-21,0.084000
2023-09-25,0.092000
1987-12-30,0.120000
2014-02-25,0.072000
2014-09-24,0.072000
2000-10-23,0.192000
2012-07-26,0.088000
2016-09-23,0.056000
2025-01-27,0.091000
2015-12-17,0.096000
2016-08-25,0.056000
2013-05-23,0.080000
2014-04-25,0.072000
2019-12-17,0.068000
1997-08-29,0.192000
2008-09-22,0.120000
1991-03-15,0.680000
2008-05-21,0.120000
2011-09-21,0.104000
2023-12-14,0.119000
1994-06-30,0.196000
1998-01-30,0.192000
2013-06-24,0.080000
2018-12-13,0.236000
1995-03-31,0.196000
1996-11-29,0.192000
2003-10-21,0.124000
2026-02-23,0.091000
2004-05-21,0.124000
1989-09-15,0.680000
2001-11-21,0.164000
2013-12-17,0.864000
2017-01-25,0.056000
2008-06-23,0.120000
2011-11-21,0.104000
2016-03-24,0.064000
2023-11-22,0.096000
1997-04-30,0.192000
2017-07-25,0.048000
2020-09-24,0.066000
2022-01-25,0.055000
1992-11-12,0.224000
2005-09-21,0.128000
2013-07-25,0.072000
2018-06-25,0.064000
2026-05-22,0.092000
2018-04-25,0.064000
1994-02-28,0.200000
1998-08-31,0.068000
2001-02-21,0.192000
2005-06-21,0.128000
2006-03-21,0.128000
2010-09-21,0.120000
2012-11-27,0.080000
2022-04-25,0.058000
2024-08-26,0.093000
2017-11-21,0.064000
1999-02-22,0.192000
2015-08-25,0.084000
2006-11-21,0.120000
2016-04-25,0.064000
2019-09-24,0.076000
1991-12-16,0.680000
2000-06-21,0.192000
1995-01-31,0.196000
2013-03-25,0.072000
2018-02-23,0.064000
2012-10-25,0.080000
2013-01-25,0.072000
2025-08-25,0.091000
1993-04-30,0.212000
2007-12-21,0.120000
1994-03-31,0.200000
1998-12-21,0.192000
2009-12-21,0.084000
2015-06-25,0.080000
1997-07-31,0.192000
2014-01-24,0.072000
2019-07-25,0.076000
2026-06-24,0.092000
1996-06-07,0.192000
2006-10-23,0.120000
2014-10-24,0.072000
1999-07-21,0.192000
2016-10-25,0.040000
2024-04-24,0.097000
1998-06-30,0.192000
2006-08-21,0.120000
2009-03-23,0.100000
2013-04-25,0.080000
2022-12-14,0.103000
2026-07-27,0.094000
2000-08-21,0.192000
1996-12-26,0.192000
2002-04-22,0.152000
2012-08-27,0.088000
2016-11-22,0.044000
2017-06-21,0.048000
1999-03-22,0.192000
2004-09-21,0.128000
2007-02-21,0.120000
2022-05-24,0.060000
2010-02-22,0.084000
2012-01-25,0.088000
2020-06-24,0.072000
1993-06-30,0.212000
2002-02-28,0.164000
2024-01-25,0.097000
2024-12-13,0.091000
2001-10-22,0.164000
2004-03-22,0.124000
2005-04-21,0.128000
2012-02-24,0.088000
2021-03-25,0.063000
1990-12-17,0.640000
1992-10-14,0.224000
2007-09-21,0.120000
2020-11-23,0.066000
1993-12-28,0.200000
1992-05-14,0.228000
2011-06-21,0.100000
1997-10-31,0.192000
1999-08-23,0.192000
2000-09-21,0.192000
2002-07-19,0.152000
2007-07-23,0.120000
2009-04-21,0.100000
2016-06-24,0.056000
2004-02-23,0.124000
2008-03-24,0.120000
2017-10-25,0.064000
2022-08-25,0.070000
2001-06-21,0.184000
2001-07-23,0.184000
2011-03-21,0.100000
2011-10-21,0.104000
2017-02-23,0.052000
2018-01-25,0.064000
2018-08-24,0.068000
2023-06-26,0.088000
1996-05-07,0.192000
2008-11-21,0.120000
2010-01-21,0.084000
2021-04-26,0.063000
1994-08-31,0.196000
2016-05-25,0.056000
2019-10-25,0.076000
1996-10-31,0.192000
2011-02-22,0.100000
2002-08-20,0.144000
2008-10-21,0.120000
2021-06-24,0.063000
2015-04-24,0.072000
2024-02-23,0.097000
1997-01-31,0.192000
2010-04-30,0.160000
1988-02-16,0.200000
2009-06-22,0.100000
2026-01-26,0.091000
1997-12-26,0.192000
2005-08-22,0.128000
2025-05-23,0.091000
1993-10-29,0.212000
2012-12-18,0.236000
2023-08-25,0.091000
1996-07-31,0.192000
1999-01-21,0.192000
2019-01-25,0.076000
2019-08-23,0.076000
2024-03-22,0.097000
1995-07-10,0.192000
2000-01-21,0.192000
2004-04-21,0.124000
2013-09-24,0.072000
2020-02-25,0.068000
1992-03-12,0.228000
1992-09-14,0.224000
2000-05-22,0.192000
2024-09-24,0.092000
2008-08-21,0.120000
2009-07-21,0.100000
2018-05-24,0.064000
2022-11-23,0.080000
1996-04-08,0.192000
2002-10-18,0.144000
2005-02-22,0.128000
2009-08-21,0.084000
2016-01-25,0.072000
2020-03-25,0.068000
2021-08-25,0.060000
1997-11-28,0.192000
1999-05-21,0.192000
2002-12-23,0.124000
2024-05-24,0.096000
1993-07-30,0.212000
2019-02-25,0.076000
2021-10-25,0.055000
1999-10-21,0.192000
2022-06-24,0.064000
1991-09-16,0.680000
1998-07-28,0.192000
1993-11-30,0.212000
1997-06-30,0.192000
2000-12-18,0.192000
2009-02-23,0.120000
2008-12-22,0.284000
2023-03-27,0.086000
1990-06-14,0.720000
2003-05-21,0.124000
2004-11-22,0.128000
2013-11-25,0.080000
2017-09-25,0.064000
1989-06-15,0.680000
1988-12-15,0.520000
1992-02-13,0.228000
1994-12-27,0.196000
2009-09-21,0.084000
2020-07-24,0.072000
2024-11-21,0.091000
2006-07-21,0.120000
2021-01-25,0.063000
1986-02-18,0.200000
1992-12-28,0.212000
1995-12-26,0.192000
2010-12-21,0.568000
2016-12-15,0.104000
1996-06-28,0.192000
2015-03-25,0.072000
1996-02-07,0.192000
1996-09-30,0.192000
1999-04-21,0.192000
2004-12-21,0.536000
2013-08-26,0.072000
2020-12-14,0.066000
1996-12-31,0.152000
2005-10-21,0.128000
2005-01-21,0.128000
2015-09-25,0.084000
2020-01-24,0.068000
1989-03-15,0.560000
2002-11-20,0.124000
2006-01-23,0.128000
2007-10-22,0.120000
2018-03-23,0.064000
2025-07-25,0.091000
1998-02-27,0.192000
1999-09-21,0.192000
2011-07-21,0.100000
2026-03-25,0.091000
1997-09-30,0.192000
2005-11-21,0.128000
2023-02-22,0.085000
2001-09-21,0.164000
2025-12-12,0.095000
2022-02-22,0.055000
2000-11-22,0.192000
2002-01-22,0.164000
2004-10-21,0.128000
2006-04-21,0.128000
2013-10-25,0.080000
2014-06-25,0.072000
2018-09-24,0.068000
2026-04-24,0.092000
1992-06-12,0.228000
1998-07-31,0.068000
2004-08-23,0.128000
2006-09-21,0.120000
2015-05-26,0.072000
2020-04-24,0.068000
2021-12-09,0.336000
1999-06-21,0.192000
2010-10-21,0.120000
2017-04-25,0.056000
2003-11-21,0.124000
2012-03-23,0.088000
2018-07-25,0.064000
1986-11-17,0.120000
1987-05-15,0.240000
1993-08-31,0.212000
2025-10-27,0.091000
1997-05-30,0.192000
2001-12-21,0.164000
2025-02-24,0.091000
2018-11-26,0.080000
1995-10-06,0.192000
1997-12-18,0.068000
2000-07-21,0.192000
2004-01-21,0.124000
2011-01-21,0.100000
2019-11-25,0.072000
2022-07-25,0.068000
1998-09-25,0.124000
2000-02-22,0.192000
2008-04-21,0.120000
1988-09-15,0.440000
2007-03-21,0.120000
2020-10-26,0.066000
1998-08-27,0.124000
2003-12-22,0.404000
2004-06-21,0.124000
2008-07-21,0.120000
2025-04-24,0.091000
1995-08-07,0.192000
2007-08-21,0.120000
2023-07-25,0.090000
2025-03-25,0.091000
1995-06-07,0.196000
1999-12-10,0.192000
2007-06-21,0.120000
2009-05-21,0.100000
2017-03-22,0.052000
2019-05-24,0.076000
2023-10-25,0.095000
1995-12-07,0.192000
2003-09-22,0.124000
2005-07-21,0.128000
2007-11-21,0.120000
2017-08-25,0.048000
2020-05-26,0.072000
2001-01-22,0.192000
2001-05-21,0.184000
2002-06-21,0.152000
2013-02-25,0.072000
2015-10-23,0.084000
2005-05-23,0.128000
2017-12-14,0.340000
2022-10-25,0.078000
1992-07-14,0.228000
2014-08-25,0.072000
1992-04-14,0.228000
2006-02-21,0.128000
2021-02-22,0.063000
2003-02-21,0.124000
2009-01-21,0.120000
2009-10-21,0.084000
2010-06-21,0.084000
2024-10-25,0.091000
2025-06-24,0.091000
1988-06-15,0.520000
1992-12-14,0.224000
2020-08-25,0.068000
2015-01-23,0.072000
2022-03-25,0.056000
1995-04-28,0.196000
2012-09-25,0.088000
1994-09-30,0.196000