f/overrides/event-backup/libax-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
2004-08-31,0.144000
2011-09-30,0.100000
2011-10-31,0.108000
2017-02-28,0.064000
2024-05-31,0.110000
2001-02-20,0.204000
2003-12-31,0.144000
2004-03-31,0.144000
2013-09-30,0.072000
2014-03-31,0.068000
2022-12-30,0.113000
2006-01-31,0.136000
2013-04-30,0.080000
2016-05-31,0.084000
2026-07-31,0.121000
2003-09-30,0.144000
2013-12-03,0.240000
2014-04-30,0.072000
2014-09-30,0.076000
2020-03-31,0.064000
2021-02-26,0.110000
2004-01-30,0.144000
2009-09-30,0.148000
2013-07-31,0.068000
2015-02-27,0.080000
2020-09-30,0.082000
2004-06-30,0.144000
2005-12-30,0.156000
2007-08-31,0.144000
2011-02-28,0.116000
2015-10-30,0.036000
2016-04-29,0.080000
2017-04-28,0.068000
2017-11-30,0.080000
2019-05-31,0.092000
2021-08-31,0.072000
2000-09-20,0.136000
2011-12-30,0.152000
2012-05-31,0.108000
2017-12-29,0.068000
2018-12-31,0.140000
2020-01-31,0.080000
2005-02-28,0.140000
2005-07-29,0.132000
2009-03-31,0.144000
2019-01-31,0.084000
2023-03-31,0.050000
2023-10-31,0.140000
2024-02-29,0.108000
2025-04-30,0.115000
2003-10-31,0.144000
2004-12-08,0.108000
2007-02-28,0.148000
2007-11-30,0.156000
2017-03-31,0.072000
2019-11-29,0.096000
2020-07-31,0.084000
2018-05-31,0.060000
2023-07-31,0.120000
2023-12-29,0.132000
2004-04-30,0.144000
2006-03-31,0.136000
2008-04-30,0.144000
2012-06-29,0.096000
2014-02-28,0.068000
2003-03-31,0.152000
2003-08-29,0.144000
2007-12-31,0.144000
2017-10-31,0.072000
2022-01-31,0.069000
2009-12-02,0.164000
2010-09-30,0.128000
2012-08-31,0.084000
2023-09-29,0.119000
2005-03-31,0.132000
2009-10-30,0.144000
2011-11-30,0.104000
2013-10-31,0.076000
2023-04-28,0.050000
2004-07-30,0.144000
2007-01-31,0.144000
2007-04-30,0.144000
2014-10-31,0.072000
2018-08-31,0.068000
2019-10-31,0.104000
2021-09-30,0.065000
2005-06-30,0.136000
2005-11-30,0.136000
2008-05-30,0.144000
2011-01-31,0.132000
2015-07-31,0.056000
2017-09-29,0.084000
2006-07-31,0.144000
2024-10-31,0.120000
2009-04-30,0.148000
2016-06-30,0.076000
2025-02-28,0.122000
2025-12-31,0.123000
2026-02-27,0.110000
2008-03-31,0.132000
2012-12-31,0.080000
2018-01-31,0.072000
2019-09-30,0.096000
2002-05-31,0.184000
2004-05-28,0.144000
2005-10-31,0.136000
2008-06-19,0.076000
2011-07-29,0.100000
2016-01-29,0.064000
2022-07-29,0.092000
2010-01-29,0.136000
2010-06-30,0.132000
2012-03-30,0.140000
2012-07-31,0.108000
2014-11-28,0.068000
2019-04-30,0.092000
2000-08-18,0.136000
2003-05-30,0.152000
2003-07-31,0.144000
2003-11-28,0.144000
2005-01-31,0.140000
2008-01-31,0.148000
2003-04-30,0.152000
2004-09-30,0.132000
2011-03-31,0.120000
2013-03-28,0.084000
2015-03-31,0.084000
2015-12-31,0.068000
2019-06-28,0.092000
2023-05-31,0.101000
2023-06-30,0.115000
2001-07-31,0.184000
2006-12-29,0.148000
2019-12-31,0.088000
2001-01-19,0.204000
2010-11-30,0.124000
2020-06-30,0.084000
2021-07-30,0.076000
2017-01-31,0.084000
2020-12-31,0.120000
2006-05-31,0.140000
2007-05-31,0.144000
2016-10-31,0.076000
2021-10-29,0.059000
2022-04-29,0.070000
2025-07-31,0.120000
2002-10-31,0.164000
2007-09-28,0.140000
2012-01-31,0.144000
2014-05-30,0.088000
2018-10-31,0.084000
2021-05-28,0.093000
2025-10-31,0.120000
2000-12-20,0.200000
2006-02-28,0.132000
2007-07-31,0.140000
2013-12-31,0.072000
2023-11-30,0.136000
2005-08-31,0.132000
2008-12-31,0.140000
2021-03-31,0.110000
2026-06-30,0.116000
2002-08-30,0.172000
2012-10-31,0.092000
2017-05-31,0.076000
2010-02-26,0.136000
2025-05-30,0.121000
2000-10-20,0.204000
2014-01-31,0.084000
2018-07-31,0.064000
2019-07-31,0.096000
2025-06-30,0.121000
2026-03-31,0.112000
2004-12-31,0.140000
2008-06-30,0.148000
2009-02-27,0.144000
2013-01-31,0.080000
2002-06-28,0.172000
2008-02-29,0.136000
2021-06-30,0.084000
2021-12-31,0.069000
2008-09-30,0.148000
2012-02-29,0.120000
2018-03-29,0.064000
2020-05-29,0.076000
2023-02-28,0.060000
2026-04-30,0.112000
2003-01-31,0.164000
2010-10-29,0.124000
2014-07-31,0.068000
2018-02-28,0.064000
2020-04-30,0.064000
2022-10-31,0.123000
2010-07-30,0.128000
2011-04-29,0.132000
2020-02-28,0.064000
2012-09-28,0.084000
2014-08-29,0.068000
2024-12-31,0.120000
2009-07-31,0.144000
2013-08-30,0.068000
2015-01-30,0.072000
2015-09-30,0.044000
2020-11-30,0.087000
2021-11-30,0.064000
2024-11-29,0.126000
2005-05-31,0.136000
2019-08-30,0.092000
2025-01-31,0.119000
2025-09-30,0.118000
2004-02-27,0.144000
2008-10-31,0.140000
2008-11-28,0.144000
2018-11-30,0.108000
2020-12-01,1.870000
2004-10-29,0.144000
2008-07-31,0.148000
2024-09-30,0.117000
2006-09-29,0.144000
2024-04-30,0.100000
2010-08-31,0.136000
2016-11-30,0.648000
2023-01-31,0.080000
2004-11-30,0.144000
2011-08-31,0.120000
2012-11-30,0.676000
2015-08-31,0.040000
2002-09-30,0.164000
2020-08-31,0.084000
2020-10-30,0.082000
2005-09-30,0.136000
2006-06-30,0.144000
2009-01-30,0.132000
2009-06-30,0.140000
2025-08-29,0.119000
2002-04-30,0.200000
2006-04-28,0.140000
2009-08-31,0.148000
2009-12-31,0.136000
2010-05-28,0.132000
2016-07-29,0.076000
2013-05-31,0.072000
2019-02-28,0.092000
2024-01-31,0.122000
2025-03-31,0.111000
2000-11-20,0.204000
2014-12-31,0.088000
2016-08-31,0.080000
2017-06-30,0.072000
2019-12-02,0.492000
2022-09-30,0.110000
2024-03-28,0.100000
2002-07-31,0.172000
2006-08-31,0.144000
2011-06-30,0.108000
2015-04-30,0.056000
2015-11-30,0.484000
2022-08-31,0.110000
2022-11-30,0.115000
2007-06-29,0.144000
2018-04-30,0.056000
2021-01-29,0.120000
2023-08-31,0.115000
2021-12-02,0.085000
2024-06-28,0.116000
2013-06-28,0.068000
2015-05-29,0.056000
2016-02-29,0.064000
2016-09-30,0.076000
2022-06-30,0.080000
2016-12-30,0.088000
2017-08-31,0.084000
2010-03-31,0.136000
2011-05-31,0.116000
2012-04-30,0.100000
2013-02-28,0.068000
2017-07-31,0.084000
2026-05-29,0.120000
2003-06-30,0.152000
2006-10-31,0.144000
2007-03-30,0.144000
2009-11-30,0.144000
2014-06-30,0.060000
2021-04-30,0.102000
2022-05-31,0.070000
2002-11-29,0.164000
2005-04-29,0.136000
2006-11-30,0.144000
2022-02-28,0.073000
2024-08-30,0.120000
2002-12-31,0.164000
2008-08-29,0.148000
2009-05-29,0.132000
2024-07-31,0.120000
2026-01-30,0.115000
2007-10-31,0.144000
2015-06-30,0.056000
2019-03-29,0.092000
2003-02-28,0.152000
2010-12-31,0.120000
2018-06-29,0.060000
2018-09-28,0.076000
2022-03-31,0.073000
2025-11-28,0.117000
2013-11-29,0.072000
2016-03-31,0.076000