f/overrides/event-backup/iye-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
2014-12-24,0.218000
2015-03-25,0.266000
2023-06-07,0.251000
2024-09-25,0.347000
2002-12-13,0.054667
2003-12-16,0.061000
2010-03-25,0.116000
2015-12-24,0.264000
2018-12-17,0.233000
2022-06-09,0.343000
2013-12-23,0.193000
2014-09-24,0.258000
2004-03-26,0.057000
2013-06-26,0.207000
2009-09-22,0.123000
2017-06-27,0.208000
2023-03-23,0.378000
2003-09-12,0.060333
2004-09-24,0.065000
2013-09-24,0.185000
2025-09-16,0.381000
2013-03-25,0.191000
2026-03-17,0.307000
2007-06-28,0.095667
2010-06-24,0.130000
2014-03-25,0.170000
2017-12-19,0.201000
2018-09-26,0.237000
2000-12-20,0.053333
2022-09-26,0.484000
2024-12-17,0.309000
2026-06-15,0.309000
2018-03-22,0.279000
2019-06-17,0.265000
2001-06-08,0.044333
2006-12-20,0.085000
2008-03-25,0.100333
2017-03-24,0.215000
2021-03-25,0.117000
2024-03-21,0.296000
2007-03-23,0.105667
2010-09-23,0.129000
2018-06-26,0.234000
2002-06-14,0.064000
2006-03-24,0.080667
2009-03-25,0.121000
2009-06-24,0.117000
2020-12-14,0.211000
2025-03-18,0.330000
2005-03-24,0.058667
2011-12-22,0.135000
2012-06-19,0.182000
2016-12-21,0.200000
2001-03-09,0.051000
2003-12-12,0.056333
2005-09-23,0.062333
2022-12-13,0.414000
2005-06-20,0.082000
2011-03-25,0.129000
2016-03-23,0.232000
2019-09-24,0.277000
2020-09-23,0.270000
2021-06-10,0.196000
2000-10-18,0.035333
2011-09-23,0.145000
2015-06-24,0.336000
2019-03-20,0.270000
2006-06-22,0.107667
2007-09-25,0.090000
2012-03-26,0.147000
2023-12-20,0.358000
2015-09-25,0.282000
2002-09-13,0.052333
2006-09-26,0.083000
2012-09-25,0.167000
2020-03-25,0.261000
2001-10-01,0.051000
2004-06-25,0.069667
2001-12-14,0.050000
2008-06-25,0.116333
2008-09-24,0.115000
2024-06-11,0.301000
2016-09-26,0.213000
2019-12-16,1.308000
2009-12-23,0.128000
2021-09-24,0.304000
2002-03-08,0.059333
2004-12-23,0.061333
2014-06-24,0.273000
2017-09-26,0.431000
2025-06-16,0.300000
2020-06-15,0.220000
2003-03-07,0.062667
2003-06-13,0.065000
2007-12-27,0.085000
2012-12-19,0.184000
2016-06-21,0.231000
2005-12-22,0.062000
2011-06-24,0.149000
2021-12-13,0.280000
2008-12-23,0.104000
2022-03-24,0.327000
2025-12-16,0.341000
2010-12-22,0.124000
2023-09-26,0.332000