f/overrides/event-backup/npscx-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
2010-02-26,0.085000
2015-02-27,0.067000
2018-10-31,0.065000
2019-06-28,0.065000
2021-12-31,0.058000
2026-04-30,0.065000
2021-07-30,0.059000
2022-09-30,0.060000
2025-01-31,0.063000
2010-03-31,0.085000
2017-08-31,0.067000
2017-12-29,0.064000
2019-08-30,0.065000
2009-07-31,0.090000
2017-07-31,0.068000
2011-05-31,0.080000
2017-09-29,0.067000
2009-12-24,0.085000
2017-11-30,0.064000
2011-12-30,0.077000
2014-03-31,0.072000
2020-12-31,0.059000
2022-10-31,0.060000
2024-07-31,0.064000
2008-06-30,0.095000
2008-07-31,0.095000
2013-05-31,0.076000
2014-12-15,0.090000
2015-11-30,0.068000
2024-03-28,0.064000
2009-03-31,0.090000
2009-05-29,0.090000
2012-06-29,0.078000
2012-07-31,0.078000
2012-12-14,0.165000
2018-09-28,0.065000
2020-02-28,0.059000
2023-07-31,0.061000
2009-01-30,0.090000
2018-01-31,0.064000
2025-08-29,0.066000
2026-07-31,0.068000
2008-11-28,0.090000
2010-07-30,0.084000
2012-01-31,0.077000
2016-03-31,0.068000
2009-11-30,0.085000
2012-04-30,0.078000
2018-02-28,0.064000
2021-03-31,0.059000
2021-06-30,0.059000
2023-12-29,0.064000
2011-12-15,0.428000
2020-06-30,0.060000
2009-02-27,0.090000
2014-04-30,0.072000
2015-10-30,0.067000
2019-10-31,0.065000
2020-07-31,0.060000
2025-09-30,0.066000
2026-02-27,0.065000
2018-05-31,0.065000
2010-12-31,0.080000
2019-11-29,0.064000
2020-01-31,0.064000
2021-01-29,0.059000
2023-11-30,0.064000
2026-03-31,0.065000
2010-12-13,0.421000
2014-02-28,0.072000
2018-06-29,0.065000
2019-04-30,0.065000
2023-09-29,0.061000
2010-08-31,0.084000
2011-11-30,0.077000
2013-03-28,0.076000
2023-10-31,0.061000
2025-10-31,0.066000
2015-05-29,0.067000
2015-07-31,0.067000
2019-12-31,0.064000
2023-06-30,0.061000
2024-10-31,0.064000
2025-06-30,0.066000
2026-06-30,0.068000
2011-01-31,0.080000
2011-04-29,0.080000
2016-11-30,0.068000
2018-08-31,0.065000
2020-09-30,0.060000
2022-07-29,0.059000
2022-12-30,0.059000
2011-03-31,0.080000
2012-08-31,0.077000
2020-08-31,0.060000
2023-08-31,0.061000
2007-07-10,0.084000
2008-03-31,0.095000
2009-09-30,0.089000
2012-12-31,0.077000
2016-10-31,0.068000
2023-02-28,0.061000
2025-12-31,0.065000
2008-05-30,0.095000
2009-06-30,0.090000
2024-09-30,0.064000
2007-06-11,0.084000
2013-04-30,0.076000
2014-08-29,0.072000
2015-06-30,0.067000
2020-10-30,0.060000
2023-03-31,0.061000
2024-05-31,0.064000
2008-10-31,0.087000
2016-06-30,0.068000
2017-10-31,0.067000
2022-02-28,0.059000
2008-04-30,0.095000
2014-05-30,0.072000
2012-05-31,0.078000
2013-12-13,0.340000
2023-01-31,0.061000
2015-04-30,0.067000
2016-05-31,0.068000
2022-01-31,0.058000
2025-11-28,0.065000
2013-06-28,0.076000
2016-12-30,0.068000
2017-05-31,0.068000
2020-05-29,0.060000
2021-09-30,0.058000
2007-05-10,0.084000
2015-03-31,0.067000
2015-12-15,0.070000
2010-10-29,0.084000
2016-01-29,0.068000
2019-05-31,0.065000
2021-04-30,0.059000
2023-04-28,0.061000
2025-04-30,0.063000
2024-01-31,0.064000
2007-09-10,0.093000
2020-04-30,0.059000
2022-03-31,0.059000
2007-12-24,0.094000
2010-01-29,0.085000
2010-06-30,0.084000
2015-12-31,0.068000
2025-07-31,0.066000
2013-01-31,0.077000
2016-04-29,0.068000
2017-01-31,0.068000
2018-11-30,0.065000
2021-08-31,0.058000
2011-09-30,0.077000
2014-07-31,0.072000
2007-08-10,0.093000
2012-03-30,0.078000
2021-02-26,0.059000
2025-02-28,0.063000
2013-10-31,0.076000
2015-09-30,0.067000
2007-11-29,0.094000
2009-04-30,0.089000
2015-01-30,0.067000
2016-02-29,0.068000
2026-01-30,0.065000
2009-08-31,0.089000
2011-08-31,0.077000
2017-02-28,0.068000
2014-01-31,0.072000
2021-05-28,0.059000
2026-05-29,0.068000
2014-11-28,0.067000
2018-04-30,0.064000
2018-12-31,0.065000
2024-04-30,0.064000
2012-09-28,0.077000
2014-12-31,0.067000
2024-12-31,0.063000
2007-03-12,0.078000
2007-04-10,0.078000
2008-12-24,0.090000
2011-02-28,0.080000
2013-09-30,0.076000
2013-02-28,0.076000
2014-06-30,0.072000
2023-05-31,0.061000
2024-02-29,0.064000
2024-06-28,0.064000
2024-08-30,0.064000
2012-10-31,0.077000
2019-02-28,0.065000
2021-10-29,0.058000
2022-05-31,0.059000
2007-02-12,0.078000
2008-02-29,0.095000
2013-11-29,0.072000
2014-10-31,0.072000
2017-06-30,0.068000
2020-11-30,0.059000
2022-11-30,0.061000
2007-10-10,0.093000
2010-11-30,0.080000
2013-12-31,0.072000
2015-08-31,0.067000
2016-09-30,0.068000
2019-03-29,0.065000
2021-11-30,0.058000
2011-06-30,0.080000
2012-11-30,0.077000
2014-09-30,0.072000
2010-05-28,0.084000
2016-07-29,0.068000
2018-03-29,0.064000
2018-07-31,0.065000
2025-03-31,0.063000
2010-09-30,0.084000
2025-05-30,0.066000
2009-10-30,0.089000
2011-07-29,0.080000
2022-06-30,0.059000
2024-11-29,0.063000
2012-02-29,0.078000
2013-07-31,0.076000
2008-01-31,0.094000
2017-03-31,0.068000
2019-01-31,0.065000
2022-04-29,0.059000
2011-10-31,0.077000
2008-09-30,0.087000
2019-07-31,0.065000
2020-03-31,0.059000
2008-08-29,0.095000
2013-08-30,0.076000
2016-08-31,0.068000
2017-04-28,0.068000
2019-09-30,0.065000
2022-08-31,0.060000