f/overrides/event-backup/axs-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
2022-06-29,0.430000
2024-03-01,0.440000
2024-06-28,0.440000
2007-03-28,0.165000
2008-09-26,0.185000
2013-03-26,0.250000
2018-10-05,0.390000
2003-12-29,0.070000
2004-12-29,0.125000
2015-06-26,0.290000
2016-12-28,0.380000
2018-03-28,0.390000
2023-09-29,0.440000
2008-03-27,0.185000
2011-03-29,0.230000
2014-03-27,0.270000
2014-06-26,0.270000
2007-06-27,0.165000
2008-06-26,0.185000
2018-06-28,0.390000
2017-03-29,0.380000
2017-06-28,0.380000
2020-10-01,0.410000
2021-06-28,0.420000
2003-09-26,0.070000
2006-06-28,0.150000
2007-09-26,0.165000
2014-09-26,0.270000
2019-06-27,0.400000
2004-03-29,0.125000
2010-12-29,0.230000
2011-06-28,0.230000
2012-09-28,0.240000
2013-09-27,0.250000
2017-10-05,0.380000
2018-12-28,0.400000
2020-03-30,0.410000
2004-09-28,0.125000
2006-03-29,0.150000
2006-12-27,0.165000
2012-12-27,0.250000
2020-12-30,0.420000
2022-12-29,0.440000
2025-03-31,0.440000
2025-06-30,0.440000
2005-03-29,0.150000
2009-03-27,0.200000
2010-09-28,0.210000
2022-09-30,0.430000
2023-06-29,0.440000
2009-06-26,0.200000
2011-12-28,0.240000
2015-03-27,0.290000
2021-03-30,0.420000
2021-10-01,0.420000
2021-12-29,0.430000
2022-03-30,0.430000
2023-03-30,0.440000
2009-09-28,0.200000
2013-12-27,0.270000
2017-12-28,0.390000
2019-03-28,0.400000
2026-03-31,0.440000
2005-12-28,0.150000
2010-06-28,0.210000
2019-10-02,0.400000
2023-12-28,0.440000
2024-09-30,0.440000
2008-12-29,0.200000
2013-06-26,0.250000
2016-03-29,0.350000
2019-12-30,0.410000
2015-12-29,0.350000
2016-09-29,0.350000
2026-06-30,0.440000
2004-06-28,0.125000
2006-09-27,0.150000
2014-12-29,0.290000
2015-09-28,0.290000
2012-06-27,0.240000
2020-06-26,0.410000
2024-12-31,0.440000
2005-06-28,0.150000
2009-12-29,0.210000
2010-03-29,0.210000
2016-06-28,0.350000
2005-09-28,0.150000
2007-12-27,0.185000
2011-09-29,0.230000
2012-03-28,0.240000