f/overrides/event-backup/gatex-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,ctime
1980-01-21,0.15,2021-04-20 09:39:43
1999-12-30,0.043,2021-04-20 09:39:43
2012-09-20,0.102,2021-04-20 09:39:43
2017-03-29,0.096,2021-04-20 09:39:43
1980-07-23,0.15,2021-04-20 09:39:43
2008-09-26,0.12,2021-04-20 09:39:43
1984-10-24,0.17,2021-04-20 09:39:43
2017-06-28,0.09,2021-04-20 09:39:43
1980-10-14,0.16,2021-04-20 09:39:43
1992-09-30,0.07,2021-04-20 09:39:43
1990-12-27,0.14,2021-04-20 09:39:43
2019-12-18,0.08,2021-04-20 09:39:43
2013-03-21,0.092,2021-04-20 09:39:43
2009-03-27,0.16,2021-04-20 09:39:43
1987-09-16,0.05,2021-04-20 09:39:43
1996-09-30,0.05,2021-04-20 09:39:43
2011-12-20,0.121,2021-04-20 09:39:43
2003-12-30,0.17,2021-04-20 09:39:43
1984-01-23,0.1,2021-04-20 09:39:43
2013-06-20,0.104,2021-04-20 09:39:43
2009-06-26,0.12,2021-04-20 09:39:43
2007-09-26,0.13,2021-04-20 09:39:43
2011-09-22,0.105,2021-04-20 09:39:43
2016-03-30,0.133,2021-04-20 09:39:43
1981-01-21,0.16,2021-04-20 09:39:43
1992-12-30,0.07,2021-04-20 09:39:43
1981-04-22,0.16,2021-04-20 09:39:43
1987-12-16,0.05,2021-04-20 09:39:43
2016-12-20,0.097,2021-04-20 09:39:43
2012-03-22,0.103,2021-04-20 09:39:43
2020-09-24,0.067,2021-04-20 09:39:43
2020-12-18,0.062,2021-04-20 09:39:43
2016-09-30,0.096,2021-04-20 09:39:43
1991-12-30,0.09,2021-04-20 09:39:43
1991-09-26,0.07,2021-04-20 09:39:43
2012-06-21,0.102,2021-04-20 09:39:43
2012-12-20,0.161,2021-04-20 09:39:43
2004-12-30,0.29,2021-04-20 09:39:43
1984-07-25,0.2,2021-04-20 09:39:43
1985-01-23,0.13,2021-04-20 09:39:43
1988-12-16,0.06,2021-04-20 09:39:43
1997-12-31,0.047,2021-04-20 09:39:43
1982-07-21,0.16,2021-04-20 09:39:43
1982-01-22,0.16,2021-04-20 09:39:43
1998-09-30,0.03,2021-04-20 09:39:43
1982-10-20,0.16,2021-04-20 09:39:43
1993-12-31,0.08,2021-04-20 09:39:43
1986-04-17,0.08,2021-04-20 09:39:43
1982-04-23,0.16,2021-04-20 09:39:43
1990-06-27,0.09,2021-04-20 09:39:43
1993-03-31,0.07,2021-04-20 09:39:43
2015-09-29,0.099,2021-04-20 09:39:43
2019-09-25,0.099,2021-04-20 09:39:43
1994-09-30,0.07,2021-04-20 09:39:43
1997-03-31,0.05,2021-04-20 09:39:43
1990-09-26,0.09,2021-04-20 09:39:43
2005-12-29,0.445,2021-04-20 09:39:43
2018-03-26,0.103,2021-04-20 09:39:43
1981-07-22,0.16,2021-04-20 09:39:43
1985-10-23,0.11,2021-04-20 09:39:43
2009-09-25,0.105,2021-04-20 09:39:43
1983-01-21,0.16,2021-04-20 09:39:43
1989-12-19,0.13,2021-04-20 09:39:43
2010-04-09,0.019,2021-04-20 09:39:43
1993-06-30,0.07,2021-04-20 09:39:43
1999-03-31,0.03,2021-04-20 09:39:43
1981-10-21,0.16,2021-04-20 09:39:43
1994-12-30,0.06,2021-04-20 09:39:43
1983-04-22,0.16,2021-04-20 09:39:43
1997-06-30,0.04,2021-04-20 09:39:43
2014-03-20,0.115,2021-04-20 09:39:43
1989-09-27,0.08,2021-04-20 09:39:43
1990-03-28,0.09,2021-04-20 09:39:43
2002-12-30,0.153,2021-04-20 09:39:43
2014-06-19,0.099,2021-04-20 09:39:43
2014-12-18,0.078,2021-04-20 09:39:43
1986-07-23,0.08,2021-04-20 09:39:43
2021-03-24,0.046,2021-04-20 09:39:43
1984-04-26,0.1,2021-04-20 09:39:43
1992-06-30,0.07,2021-04-20 09:39:43
1995-12-29,0.051,2021-04-20 09:39:43
1996-06-28,0.05,2021-04-20 09:39:43
1980-04-24,0.15,2021-04-20 09:39:43
1987-06-16,0.08,2021-04-20 09:39:43
2015-12-21,0.066,2021-04-20 09:39:43
1995-03-31,0.07,2021-04-20 09:39:43
2017-09-28,0.113,2021-04-20 09:39:43
1991-03-27,0.07,2021-04-20 09:39:43
2013-09-24,0.105,2021-04-20 09:39:43
2007-12-27,0.125,2021-04-20 09:39:43
1985-07-25,0.11,2021-04-20 09:39:43
1996-12-31,0.052,2021-04-20 09:39:43
2020-03-25,0.088,2021-04-20 09:39:43
2000-12-29,0.078,2021-04-20 09:39:43
1983-07-22,0.1,2021-04-20 09:39:43
1985-04-25,0.11,2021-04-20 09:39:43
1995-06-30,0.07,2021-04-20 09:39:43
2020-06-24,0.088,2021-04-20 09:39:43
2016-06-30,0.095,2021-04-20 09:39:43
1983-10-21,0.13,2021-04-20 09:39:43
1988-03-23,0.05,2021-04-20 09:39:43
1991-06-26,0.07,2021-04-20 09:39:43
1992-03-31,0.07,2021-04-20 09:39:43
1995-09-29,0.07,2021-04-20 09:39:43
1996-03-29,0.05,2021-04-20 09:39:43
2008-03-27,0.135,2021-04-20 09:39:43
2008-12-31,0.156,2021-04-20 09:39:43
1987-03-17,0.08,2021-04-20 09:39:43
2008-06-26,0.116,2021-04-20 09:39:43
1998-06-30,0.03,2021-04-20 09:39:43
2015-03-30,0.103,2021-04-20 09:39:43
2006-09-27,0.12,2021-04-20 09:39:43
2019-03-26,0.105,2021-04-20 09:39:43
1986-10-21,0.08,2021-04-20 09:39:43
2010-09-23,0.097,2021-04-20 09:39:43
2001-12-28,0.108,2021-04-20 09:39:43
1989-06-21,0.08,2021-04-20 09:39:43
1998-03-31,0.03,2021-04-20 09:39:43
1994-06-30,0.07,2021-04-20 09:39:43
2019-06-25,0.093,2021-04-20 09:39:43
1989-03-22,0.08,2021-04-20 09:39:43
2007-03-28,0.15,2021-04-20 09:39:43
2017-12-20,0.039,2021-04-20 09:39:43
2011-03-24,0.1,2021-04-20 09:39:43
2015-06-25,0.279,2021-04-20 09:39:43
1987-02-11,0.08,2021-04-20 09:39:43
2009-12-22,0.088,2021-04-20 09:39:43
2013-12-18,0.081,2021-04-20 09:39:43
2007-06-27,0.13,2021-04-20 09:39:43
2011-06-23,0.104,2021-04-20 09:39:43
1986-01-23,0.1,2021-04-20 09:39:43
1998-12-31,0.033,2021-04-20 09:39:43
1988-06-22,0.05,2021-04-20 09:39:43
1997-09-30,0.04,2021-04-20 09:39:43
2018-06-26,0.086,2021-04-20 09:39:43
1988-09-21,0.05,2021-04-20 09:39:43
1993-09-30,0.07,2021-04-20 09:39:43
1994-03-31,0.07,2021-04-20 09:39:43
2018-09-25,0.088,2021-04-20 09:39:43
2018-12-19,0.087,2021-04-20 09:39:43
2010-03-25,0.085,2021-04-20 09:39:43
2010-12-21,0.119,2021-04-20 09:39:43
2014-09-23,0.088,2021-04-20 09:39:43
2006-06-28,0.125,2021-04-20 09:39:43
2006-12-27,0.238,2021-04-20 09:39:43
2010-06-24,0.095,2021-04-20 09:39:43