f/overrides/event-backup/ivw-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
2005-09-26,0.049750
2018-03-22,0.116750
2024-06-11,0.074000
2009-03-25,0.044250
2019-12-16,0.298000
2003-12-15,0.051250
2005-12-23,0.043750
2006-12-21,0.055750
2008-12-24,0.050250
2012-12-19,0.115000
2024-03-21,0.084000
2009-09-23,0.049250
2009-12-24,0.057000
2017-12-19,0.131500
2020-03-25,0.125750
2003-03-10,0.030250
2007-12-27,0.051000
2012-09-25,0.088750
2002-03-11,0.024000
2016-06-21,0.123000
2024-09-25,0.145000
2025-09-16,0.138000
2009-06-23,0.049250
2007-03-26,0.052750
2016-12-21,0.128750
2025-12-16,0.130000
2010-12-23,0.060000
2013-06-26,0.082000
2000-06-21,0.006000
2014-06-24,0.093500
2021-12-13,0.093000
2022-12-13,0.137000
2023-03-23,0.188000
2007-09-26,0.049750
2011-09-26,0.063750
2020-12-14,0.143000
2010-09-24,0.060000
2006-06-23,0.045500
2020-06-15,0.117000
2022-03-24,0.127000
2026-06-15,0.126000
2001-12-17,0.027750
2021-03-25,0.097000
2021-09-24,0.113000
2022-06-09,0.105000
2001-10-02,0.035750
2001-03-12,0.022000
2013-03-25,0.081500
2018-09-26,0.117750
2023-06-07,0.148000
2013-12-23,0.103750
2002-12-16,0.038250
2006-09-27,0.049750
2013-09-24,0.090000
2014-09-24,0.092500
2001-06-11,0.014750
2006-03-27,0.040500
2014-03-25,0.081000
2015-03-25,0.097750
2017-06-27,0.122250
2003-06-16,0.034750
2010-12-29,0.004750
2002-09-16,0.031500
2005-03-28,0.063000
2018-06-26,0.120000
2002-06-17,0.026500
2015-09-25,0.115000
2015-12-24,0.125250
2018-12-17,0.126500
2004-06-28,0.037250
2011-06-23,0.063250
2007-06-29,0.049750
2011-03-25,0.059250
2016-03-23,0.107250
2017-09-26,0.134250
2019-03-20,0.146750
2004-09-27,0.042750
2003-09-15,0.035500
2021-06-10,0.084000
2017-03-24,0.109750
2020-09-23,0.136500
2022-09-26,0.153000
2012-06-19,0.074000
2019-09-24,0.155250
2025-06-16,0.118000
2026-03-17,0.101000
2005-06-21,0.031500
2025-03-18,0.108000
2004-03-29,0.033250
2008-03-25,0.046000
2008-06-24,0.043000
2019-06-17,0.187250
2004-12-27,0.130750
2008-09-25,0.048250
2012-03-26,0.066750
2014-12-24,0.114000
2000-12-13,0.044750
2023-12-20,0.213000
2024-12-17,0.133000
2011-12-22,0.086000
2015-06-24,0.100250
2010-06-23,0.052750
2010-03-25,0.049000
2016-09-26,0.102250
2023-09-26,0.223000
2000-09-20,0.016000