f/overrides/event-backup/ihfax-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
2008-08-29,0.046000
2008-09-30,0.050000
2016-04-29,0.034000
2020-10-30,0.028000
2024-08-30,0.035000
2019-12-31,0.032000
2023-02-28,0.029000
2007-03-30,0.062000
2010-07-30,0.044000
2016-12-30,0.029000
2018-05-31,0.037000
2024-11-29,0.030000
2006-12-29,0.063000
2007-07-31,0.066000
2014-03-31,0.043000
2006-09-29,0.062000
2008-11-28,0.050000
2012-06-29,0.043000
2018-12-31,0.036000
2009-02-27,0.042000
2013-01-31,0.037000
2015-04-30,0.034000
2023-08-31,0.031000
2015-11-30,0.033000
2017-03-31,0.031000
2022-05-31,0.028000
2023-06-30,0.030000
2023-12-29,0.035000
2004-09-30,0.070000
2005-05-31,0.069000
2008-05-30,0.038000
2023-04-28,0.030000
2024-01-31,0.034000
2010-09-30,0.045000
2022-07-29,0.031000
2022-09-30,0.029000
2004-11-30,0.060000
2011-06-30,0.038000
2014-01-31,0.044000
2024-09-30,0.037000
2019-02-28,0.030000
2025-01-31,0.035000
2025-04-30,0.024000
2005-12-30,0.065000
2006-01-31,0.065000
2021-02-26,0.022000
2021-04-30,0.023000
2022-03-31,0.027000
2024-12-31,0.042000
2004-05-28,0.113000
2006-07-31,0.063000
2022-06-30,0.027000
2024-04-30,0.032000
2025-02-28,0.031000
2025-06-30,0.031000
2006-08-31,0.063000
2007-04-30,0.065000
2010-12-31,0.042000
2011-10-31,0.042000
2018-08-31,0.031000
2020-12-31,0.027000
2005-09-30,0.068000
2017-01-31,0.030000
2019-04-30,0.032000
2025-03-31,0.024000
2025-10-31,0.033000
2010-01-29,0.043000
2019-07-31,0.030000
2021-08-31,0.024000
2009-09-30,0.040000
2019-09-30,0.030000
2020-08-31,0.028000
2022-08-31,0.029000
2004-12-31,0.064000
2009-11-30,0.041000
2021-11-30,0.024000
2026-02-27,0.030000
2007-12-31,0.069000
2013-02-28,0.037000
2018-03-29,0.033000
2022-11-30,0.030000
2023-10-31,0.032000
2008-07-31,0.048000
2016-10-31,0.031000
2026-01-30,0.039000
2021-03-31,0.028000
2008-12-31,0.060000
2017-05-31,0.034000
2021-01-29,0.025000
2021-12-31,0.025000
2022-12-30,0.030000
2019-08-30,0.030000
2024-06-28,0.026000
2007-05-31,0.065000
2010-11-30,0.042000
2012-07-31,0.041000
2014-05-30,0.035000
2017-04-28,0.029000
2018-07-31,0.032000
2025-12-31,0.033000
2010-02-26,0.041000
2015-08-31,0.034000
2018-10-31,0.032000
2025-07-31,0.054000
2026-04-30,0.034000
2009-04-30,0.044000
2018-01-31,0.036000
2022-04-29,0.026000
2023-09-29,0.034000
2018-02-28,0.029000
2019-03-29,0.034000
2020-11-30,0.027000
2010-03-31,0.044000
2010-06-30,0.046000
2017-08-31,0.031000
2020-09-30,0.028000
2011-12-30,0.041000
2014-07-31,0.034000
2021-10-29,0.025000
2005-12-29,0.210000
2007-01-31,0.066000
2015-01-30,0.033000
2015-09-30,0.033000
2017-06-30,0.028000
2017-11-30,0.030000
2008-04-30,0.052000
2009-10-30,0.036000
2012-08-31,0.044000
2013-07-31,0.037000
2014-02-28,0.036000
2016-02-29,0.036000
2007-11-30,0.069000
2009-03-31,0.049000
2012-12-31,0.040000
2004-10-29,0.066000
2006-12-27,0.141000
2012-03-30,0.040000
2015-12-31,0.033000
2021-07-30,0.027000
2025-11-28,0.032000
2006-05-31,0.068000
2009-08-31,0.041000
2010-05-28,0.044000
2014-06-30,0.035000
2014-11-28,0.032000
2018-06-29,0.033000
2012-11-30,0.041000
2016-08-31,0.034000
2024-03-28,0.032000
2008-01-31,0.064000
2008-02-29,0.063000
2011-03-31,0.041000
2011-05-31,0.040000
2016-03-31,0.030000
2006-10-31,0.066000
2016-06-30,0.035000
2017-02-28,0.030000
2011-07-29,0.042000
2013-11-29,0.038000
2023-01-31,0.032000
2025-05-30,0.026000
2005-04-29,0.066000
2019-11-29,0.031000
2015-07-31,0.031000
2016-09-30,0.034000
2007-06-29,0.063000
2011-01-31,0.042000
2011-09-30,0.042000
2013-08-30,0.039000
2013-09-30,0.038000
2014-10-31,0.033000
2026-07-31,0.034000
2007-10-31,0.072000
2023-07-31,0.031000
2026-06-30,0.033000
2005-06-30,0.067000
2013-03-28,0.038000
2016-01-29,0.033000
2020-07-31,0.030000
2006-06-30,0.061000
2014-12-31,0.035000
2016-07-29,0.031000
2017-07-31,0.031000
2020-04-30,0.032000
2006-02-28,0.068000
2009-05-29,0.044000
2014-04-30,0.035000
2015-10-30,0.033000
2006-04-28,0.060000
2007-09-28,0.063000
2012-04-30,0.038000
2013-12-31,0.042000
2017-10-31,0.036000
2019-01-31,0.034000
2004-12-30,0.053000
2005-08-31,0.067000
2009-01-30,0.052000
2022-10-31,0.029000
2010-10-29,0.044000
2012-05-31,0.042000
2013-04-30,0.038000
2013-10-31,0.038000
2019-06-28,0.032000
2007-02-28,0.069000
2008-03-31,0.059000
2012-10-31,0.041000
2016-05-31,0.033000
2021-05-28,0.027000
2005-01-31,0.064000
2014-09-30,0.034000
2018-04-30,0.033000
2022-02-28,0.023000
2005-11-30,0.067000
2009-06-30,0.038000
2018-09-28,0.033000
2023-05-31,0.031000
2025-08-29,0.032000
2025-09-30,0.031000
2009-07-31,0.046000
2020-03-31,0.034000
2020-05-29,0.027000
2024-07-31,0.034000
2006-03-31,0.060000
2011-02-28,0.042000
2012-02-29,0.039000
2017-09-29,0.029000
2024-05-31,0.033000
2021-06-30,0.026000
2026-03-31,0.034000
2004-06-30,0.074000
2004-07-30,0.061000
2008-10-30,0.050000
2011-08-31,0.040000
2012-01-31,0.040000
2018-11-30,0.032000
2006-11-30,0.065000
2011-04-29,0.043000
2013-06-28,0.038000
2015-02-27,0.031000
2023-11-30,0.031000
2005-10-31,0.065000
2019-05-31,0.033000
2020-02-28,0.029000
2024-10-31,0.033000
2011-11-30,0.043000
2015-03-31,0.038000
2005-02-28,0.064000
2005-07-29,0.064000
2013-05-31,0.038000
2014-08-29,0.034000
2020-06-30,0.031000
2026-05-29,0.035000
2007-12-28,0.014000
2017-12-29,0.033000
2019-10-31,0.032000
2023-03-31,0.033000
2010-08-31,0.045000
2012-09-28,0.041000
2016-11-30,0.031000
2015-06-30,0.033000
2021-09-30,0.024000
2024-02-29,0.032000
2004-08-31,0.060000
2009-12-31,0.052000
2020-01-31,0.031000
2022-01-31,0.025000
2005-03-31,0.064000
2007-08-31,0.067000
2008-06-30,0.046000
2015-05-29,0.031000