f/overrides/event-backup/aigyx-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
2000-06-26,0.200000
2008-06-25,0.250000
2009-06-25,0.180000
2010-12-30,0.180000
2012-09-28,0.180000
2017-03-31,0.188000
2018-12-20,6.483000
2003-06-25,0.200000
2016-12-16,0.471000
2017-06-30,0.188000
2011-03-30,0.180000
2018-03-29,0.188000
2020-03-13,0.188000
1999-03-29,0.104000
2004-06-23,0.200000
2010-09-29,0.180000
2015-06-30,0.188000
2023-09-15,0.072000
2025-06-20,0.116000
2006-06-26,0.220000
2007-06-25,0.240000
2009-03-26,0.180000
2013-09-30,0.188000
2024-12-20,1.096000
2007-09-25,0.240000
2016-06-30,0.188000
2017-12-29,0.188000
2026-06-18,0.066000
2007-03-26,0.235000
2019-03-15,0.188000
2025-09-19,0.040000
1999-12-27,0.314000
2002-06-24,0.200000
2008-03-26,0.250000
2015-12-31,0.188000
2021-06-18,0.039000
2019-06-14,0.188000
2022-09-16,0.148000
2003-12-23,0.259000
2005-12-22,0.525000
2007-12-21,1.951000
2017-12-15,1.172000
2002-09-24,0.205000
2003-03-25,0.188000
2005-03-24,0.200000
2025-12-19,0.632000
2008-12-19,0.250000
2020-12-22,1.621000
2015-12-04,0.270000
2014-12-31,0.188000
2018-06-29,0.188000
2021-03-19,0.025000
2021-09-17,0.023000
2022-12-21,0.670000
1999-09-24,0.148000
2000-12-22,0.215000
2009-09-25,0.180000
2016-12-30,0.188000
2018-09-14,0.188000
2000-09-25,0.200000
2006-12-21,1.284000
2023-12-21,0.162000
2026-03-20,0.081000
2001-12-20,0.310000
2024-03-15,0.105000
2005-09-26,0.210000
2020-06-19,0.188000
2004-12-23,0.563000
2013-06-28,0.188000
2015-09-30,0.188000
2023-06-16,0.095000
2024-06-21,0.083000
2003-09-25,0.205000
2014-09-30,0.188000
2021-12-22,2.052000
2022-03-18,0.023000
2020-09-18,0.078000
2025-03-21,0.085000
2001-06-25,0.200000
2005-06-24,0.210000
2012-06-29,0.180000
2013-03-28,0.188000
2015-03-31,0.188000
2002-03-26,0.188000
2004-03-23,0.190000
2016-03-31,0.188000
2024-09-20,0.085000
1999-06-24,0.164000
2004-09-23,0.205000
2012-03-30,0.180000
2000-03-27,0.186000
2001-09-24,0.205000
2010-04-30,0.028000
2011-12-29,0.180000
2006-03-27,0.210000
2012-12-31,0.188000
2016-09-30,0.188000
2002-12-20,0.267000
2011-09-29,0.180000
2019-12-20,2.249000
2006-09-25,0.220000
2009-12-23,0.180000
2014-03-31,0.188000
2019-09-13,0.188000
2023-03-17,0.119000
2008-09-25,0.250000
2010-06-29,0.180000
2011-06-29,0.180000
2013-12-31,0.188000
2017-09-29,0.188000
2001-03-26,0.186000
2010-03-30,0.180000
2014-06-30,0.188000
2022-06-17,0.078000