f/overrides/event-backup/iyh-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
2000-10-18,0.009200
2012-06-19,0.065000
2012-12-19,0.077400
2016-06-21,0.097600
2001-10-01,0.009600
2010-09-23,0.057200
2002-09-13,0.016200
2008-03-25,0.042200
2011-09-23,0.061600
2020-03-25,0.122600
2021-03-25,0.132200
2023-12-20,0.177800
2026-03-17,0.195000
2002-03-08,0.019000
2013-12-23,0.067600
2010-06-24,0.055800
2005-12-22,0.023800
2005-06-20,0.023800
2007-06-28,0.060800
2011-12-22,0.062400
2015-12-29,0.256600
2018-12-28,0.285600
2022-03-24,0.137400
2024-06-11,0.126000
2002-12-13,0.023000
2006-09-26,0.032400
2016-12-21,0.102400
2020-06-15,0.120600
2022-09-26,0.204800
2024-09-25,0.234000
2020-09-23,0.177800
2021-09-24,0.169800
2019-09-24,0.151000
2014-09-24,0.071800
2024-03-21,0.167000
2025-06-16,0.168000
2003-03-07,0.020200
2009-12-23,0.050800
2015-06-24,0.083000
2019-03-20,0.104600
2011-06-24,0.052400
2001-06-08,0.012600
2023-06-07,0.109200
2008-12-23,0.049600
2013-03-25,0.059200
2014-12-24,0.085200
2016-03-23,0.074400
2018-06-26,0.104600
2002-06-14,0.016200
2003-06-13,0.020000
2003-09-12,0.021200
2017-06-27,0.091000
2019-12-16,0.128600
2023-03-23,0.155000
2000-07-19,0.000200
2008-09-24,0.034000
2009-09-22,0.045200
2013-09-24,0.058800
2001-03-09,0.013800
2026-06-15,0.163000
2018-09-26,0.101400
2024-12-17,0.200000
2025-12-16,0.250000
2007-09-25,0.036400
2001-12-14,0.012600
2004-03-26,0.015800
2012-09-25,0.072000
2015-12-24,0.113400
2022-12-13,0.161800
2017-03-24,0.088600
2025-03-18,0.162000
2014-06-24,0.086400
2014-03-25,0.058400
2013-06-26,0.068600
2003-12-16,0.021000
2012-03-26,0.067400
2000-12-20,0.022400
2010-03-25,0.041200
2021-06-10,0.106000
2004-06-25,0.019800
2007-03-23,0.055400
2011-03-25,0.045400
2005-03-24,0.023000
2025-09-16,0.193000
2021-12-13,0.155800
2010-12-22,0.053800
2017-12-19,0.108200
2019-06-17,0.106800
2022-06-09,0.119800
2023-09-26,0.234000
2004-12-23,0.019400
2005-09-23,0.021000
2018-03-22,0.099600
2003-12-12,0.022400
2004-09-24,0.021200
2006-03-24,0.023200
2008-06-25,0.049200
2015-03-25,0.060800
2016-09-26,0.096600
2017-09-26,0.096000
2015-09-25,0.092600
2018-12-17,0.115200
2020-12-14,0.151400
2007-12-27,0.036000
2013-12-27,0.006200
2009-03-25,0.053800
2006-12-20,0.031000
2009-06-24,0.046200
2006-06-22,0.030000