f/overrides/event-backup/iusv-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
2013-09-24,0.172667
2020-03-25,0.402000
2024-09-25,0.582000
2008-09-24,0.202667
2012-12-19,0.239333
2021-03-25,0.347000
2025-06-16,0.432000
2002-12-13,0.119333
2011-03-24,0.131667
2011-07-05,0.156000
2009-07-02,0.142333
2018-06-26,0.332000
2022-12-13,0.432000
2011-09-23,0.140667
2015-12-24,0.284000
2000-12-13,0.144000
2005-06-20,0.082333
2012-03-23,0.156000
2023-09-26,0.443000
2024-06-11,0.421000
2018-03-22,0.311000
2001-03-09,0.075000
2003-06-13,0.119000
2007-12-27,0.222000
2016-07-06,0.275333
2003-12-12,0.160333
2020-12-14,0.400000
2022-06-09,0.305000
2020-06-15,0.307000
2023-03-23,0.349000
2008-07-02,0.198000
2014-03-25,0.192333
2016-09-26,0.235000
2010-07-02,0.145000
2003-12-16,0.119333
2004-09-24,0.135333
2009-03-24,0.173000
2015-09-25,0.227333
2022-03-24,0.370000
2011-12-22,0.189333
2020-09-23,0.384000
2006-06-22,0.160000
2010-09-23,0.140667
2017-03-24,0.222000
2019-03-20,0.312000
2008-03-24,0.193333
2009-09-22,0.104000
2024-12-17,0.546000
2006-03-24,0.158000
2016-03-23,0.279333
2007-09-25,0.197000
2019-09-24,0.357000
2018-12-17,0.348000
2025-03-18,0.367000
2002-03-08,0.080333
2012-09-24,0.153667
2021-06-10,0.267000
2015-03-25,0.243000
2019-12-16,0.373000
2013-03-25,0.167333
2018-09-26,0.317000
2001-06-08,0.097333
2003-03-07,0.081333
2005-03-24,0.209000
2024-03-21,0.440000
2025-12-16,0.552000
2014-09-24,0.211667
2023-06-07,0.277000
2012-06-26,0.163667
2025-09-16,0.471000
2026-03-17,0.393000
2007-06-28,0.207000
2019-06-17,0.336000
2026-06-15,0.450000
2004-06-25,0.122667
2005-12-22,0.211000
2006-09-26,0.155000
2006-12-20,0.217333
2023-12-20,0.410000
2022-09-26,0.462000
2013-12-23,0.260333
2017-09-26,0.323000
2021-09-24,0.433000
2021-12-13,0.383000
2003-09-12,0.114667
2004-12-23,0.185000
2017-06-27,0.258000
2013-07-02,0.201333
2010-03-24,0.112667
2014-12-24,0.245333
2017-12-19,0.268000
2000-09-20,0.067667
2005-09-23,0.173667
2008-12-23,0.177333
2014-07-02,0.197667
2015-07-02,0.325667
2001-12-14,0.104333
2002-06-14,0.092667
2007-03-23,0.201333
2010-12-22,0.164667
2001-10-01,0.126000
2004-03-26,0.097667
2016-12-22,0.282000
2002-09-13,0.110667
2009-12-23,0.157000