f/overrides/event-backup/csrix-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
2020-03-31,0.277000
2026-03-31,0.348000
2008-09-30,0.327000
2012-06-29,0.387000
2012-03-30,0.231000
2015-09-30,0.315000
2016-09-30,0.312000
2018-06-29,0.767000
2019-11-05,1.757000
2019-12-18,0.311000
2003-03-21,0.430000
2003-06-20,0.430000
2024-12-04,0.381000
2013-09-30,0.270000
2021-06-30,0.209000
2009-06-30,0.234000
2010-03-31,0.205000
2011-06-30,0.160000
2012-09-28,0.224000
2013-06-28,0.383000
2015-03-31,0.274000
2008-12-19,0.438000
2009-03-31,0.291000
2019-09-30,0.294000
2020-09-30,0.258000
2021-03-31,0.196000
2025-03-31,0.333000
2025-12-08,0.358000
2015-06-30,3.526000
2019-06-28,2.279000
2006-12-22,4.350000
2012-12-13,2.733000
2013-12-12,1.839000
2021-12-09,1.638000
2024-03-28,0.334000
2004-12-23,4.680000
2005-03-18,0.430000
2023-06-30,0.374000
2003-09-19,0.430000
2018-03-29,0.288000
2010-12-16,0.253000
2020-12-10,0.377000
2022-06-30,0.544000
2006-09-28,0.430000
2007-12-31,6.788000
2009-09-30,0.218000
2026-06-30,0.425000
2005-12-23,5.196000
2007-06-29,0.315000
2008-06-30,0.327000
2010-04-30,0.001000
2011-09-30,0.207000
2013-03-28,0.248000
2020-06-30,1.214000
2021-09-30,0.249000
2004-09-17,0.430000
2007-09-28,0.359000
2009-12-17,0.243000
2011-03-31,0.185000
2014-06-30,0.323000
2014-09-30,0.290000
2023-03-31,0.324000
2025-09-30,0.350000
2005-06-24,0.430000
2006-06-23,0.430000
2017-06-30,0.341000
2017-09-29,0.287000
2017-12-06,2.036000
2022-12-08,0.984000
2023-12-07,0.408000
2024-09-30,0.317000
2004-03-19,0.430000
2016-03-31,0.294000
2011-12-15,0.296000
2014-03-31,0.266000
2019-03-29,0.361000
2022-09-30,0.305000
2004-06-18,0.430000
2008-03-31,0.299000
2016-12-08,3.887000
2017-03-31,0.358000
2016-06-30,0.954000
2018-09-28,0.461000
2010-09-30,0.207000
2014-12-11,1.991000
2015-12-10,2.147000
2018-12-06,0.969000
2022-03-31,0.266000
2025-06-30,0.465000
2003-12-18,1.010000
2010-06-30,0.201000
2005-09-27,0.430000
2006-03-24,0.430000
2007-03-30,0.311000
2023-09-29,0.305000
2024-06-28,0.392000
2001-09-21,0.370000
2003-12-23,0.650000