f/overrides/event-backup/hfqax-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
2007-05-30,0.262000
2008-09-29,0.031000
2008-11-26,0.032000
2009-02-26,0.027000
2012-07-30,0.025000
2020-09-30,0.107000
2013-10-30,0.019000
2015-03-30,0.045000
2020-12-17,0.102000
2026-03-31,0.095000
2009-08-28,0.060000
2019-09-30,0.107000
2014-09-29,0.036000
2010-01-28,0.025000
2013-09-27,0.036000
2014-04-29,0.065000
2009-10-29,0.030000
2011-07-28,0.025000
2015-10-29,0.019000
2023-03-31,0.095000
2024-09-30,0.107000
2009-12-30,0.025000
2010-11-29,0.030000
2012-05-30,0.070000
2007-08-30,0.102000
2012-10-31,0.019000
2013-12-30,0.038000
2016-12-27,0.096000
2017-06-27,0.183000
2009-03-30,0.040000
2011-04-28,0.065000
2012-11-29,0.045000
2014-03-28,0.045000
2025-06-30,0.183000
2008-08-28,0.052000
2009-04-29,0.074000
2010-06-29,0.050000
2023-12-11,0.096000
2013-08-29,0.048000
2021-03-31,0.095000
2026-06-30,0.183000
2024-06-28,0.183000
2007-09-28,0.057000
2008-07-30,0.047000
2012-03-29,0.045000
2014-06-27,0.048000
2017-03-28,0.095000
2018-03-29,0.095000
2018-06-29,0.183000
2011-06-29,0.048000
2013-03-27,0.045000
2018-12-18,0.096000
2019-03-29,0.095000
2020-03-31,0.095000
2025-09-30,0.107000
2017-12-19,0.096000
2008-12-30,0.030000
2010-02-25,0.030000
2010-08-30,0.060000
2010-09-29,0.036000
2013-04-29,0.065000
2013-06-27,0.048000
2013-11-27,0.045000
2024-12-10,0.096000
2008-10-30,0.030000
2010-10-28,0.030000
2014-10-30,0.019000
2008-01-31,0.051000
2010-05-27,0.080000
2012-06-28,0.048000
2023-09-29,0.107000
2010-12-30,0.056000
2011-02-25,0.028000
2013-02-27,0.028000
2015-07-30,0.025000
2018-09-28,0.107000
2022-03-31,0.095000
2022-06-30,0.183000
2011-12-29,0.032000
2014-02-27,0.030000
2015-06-29,0.048000
2008-04-29,0.085000
2011-01-28,0.022000
2014-08-28,0.048000
2025-12-09,0.096000
2010-03-30,0.045000
2019-06-28,0.183000
2023-06-30,0.183000
2008-03-31,0.103000
2009-01-29,0.030000
2012-01-30,0.022000
2012-08-30,0.053000
2014-01-30,0.020000
2015-04-29,0.065000
2012-02-28,0.028000
2013-01-30,0.022000
2015-02-26,0.030000
2021-12-22,0.096000
2022-09-30,0.107000
2009-05-28,0.087000
2012-09-27,0.031000
2015-09-29,0.036000
2019-12-17,0.096000
2025-03-31,0.095000
2014-05-29,0.070000
2014-12-30,0.031000
2015-05-28,0.070000
2015-12-30,0.031000
2020-06-30,0.177000
2007-11-28,0.031000
2008-02-29,0.039000
2009-07-30,0.042000
2014-11-26,0.045000
2016-06-27,0.183000
2007-06-28,0.111000
2008-06-27,0.071000
2009-09-29,0.040000
2011-09-29,0.030000
2007-07-30,0.053000
2011-03-30,0.043000
2011-08-30,0.054000
2011-11-29,0.045000
2014-07-30,0.025000
2017-09-29,0.107000
2021-09-30,0.107000
2016-09-27,0.108000
2021-06-30,0.183000
2007-10-31,0.065000
2007-12-28,0.032000
2009-11-27,0.030000
2011-10-28,0.019000
2013-05-30,0.070000
2013-07-30,0.025000
2015-11-27,0.045000
2022-12-22,0.096000
2024-03-28,0.095000
2015-08-28,0.048000
2008-05-29,0.099000
2009-06-29,0.071000
2010-07-29,0.040000
2011-05-27,0.070000
2012-04-27,0.065000
2012-12-28,0.038000
2015-01-29,0.020000
2016-03-28,0.095000