f/overrides/event-backup/btiix-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
2002-04-02,0.400000
2007-03-23,0.704000
2012-03-23,0.595000
2013-12-16,1.197000
2014-09-23,1.042000
2018-03-22,0.813000
1998-12-04,2.610000
2001-07-03,0.430000
1998-03-30,0.486000
1998-09-29,0.549000
2000-09-29,0.510000
2006-06-23,0.620000
2007-06-22,0.766000
2012-09-21,0.710000
2014-12-16,8.732000
1997-12-12,4.572000
2018-12-17,35.005000
2021-12-15,27.368000
2020-03-24,0.832000
2011-03-24,0.549000
2010-03-24,0.538000
1998-06-29,0.490000
2003-06-23,0.400000
2006-03-24,0.600000
2009-09-23,0.586000
2020-06-23,7.278000
1997-09-29,0.580000
2004-12-20,1.020000
2011-06-23,0.570000
2019-06-21,6.476000
1999-06-25,1.460000
2019-03-22,0.819000
2022-09-23,0.621000
2024-09-23,0.536000
2026-03-24,0.319000
1996-09-12,0.384000
2000-12-05,13.890000
2010-06-23,0.550000
2021-06-23,3.459000
2023-03-24,0.579000
2023-12-15,37.782000
1998-12-28,0.530000
2014-06-23,0.862000
2024-03-21,0.513000
2025-06-23,0.409000
1997-03-27,2.838000
2003-09-23,0.400000
2019-12-16,19.375000
2025-09-23,0.424000
2002-07-02,0.420000
2003-12-19,0.600000
1999-12-27,0.500000
2021-09-23,0.678000
2000-06-30,0.520000
2005-12-20,0.694000
2006-12-15,0.835000
2025-12-15,20.398000
2026-06-23,6.562000
2002-12-20,0.400000
2004-09-23,0.500000
2015-06-23,0.873000
2015-12-15,12.480000
2024-06-21,2.849000
2001-12-27,0.540000
2008-03-24,0.740000
2008-09-23,0.711000
2009-12-16,0.623000
2012-06-22,0.653000
2015-03-24,3.205000
1999-12-06,1.345000
2007-09-21,0.794000
2010-12-15,0.826000
2018-06-22,2.500000
2005-03-24,0.530000
2000-03-31,0.890000
2001-10-02,0.470000
2020-09-23,0.769000
2022-12-15,18.848000
2025-03-24,0.376000
1997-12-23,0.460000
2004-06-23,0.500000
2008-12-16,0.851000
2014-03-24,0.815000
2016-03-23,0.871000
2017-12-15,25.973000
2019-09-23,0.878000
2000-12-26,0.470000
2023-09-22,0.654000
2002-10-02,0.420000
1999-09-24,0.600000
2005-09-23,0.590000
2010-09-23,0.613000
2012-12-17,1.366000
2013-09-23,0.764000
2016-09-23,0.948000
1996-12-12,3.618000
2009-06-23,0.595000
2017-03-24,0.886000
2017-06-23,5.680000
2007-12-14,0.877000
2003-03-24,0.400000
2006-09-22,0.700000
2016-12-15,20.299000
1996-07-01,2.952000
2023-06-23,1.263000
2020-12-15,30.182000
2001-03-30,0.460000
2016-06-23,2.089000
2018-09-21,1.007000
1996-12-27,3.162000
2011-09-23,0.631000
2021-03-24,0.700000
2022-03-24,0.622000
1997-06-27,2.964000
2005-06-23,0.570000
2008-06-23,0.698000
2013-06-21,0.804000
2001-12-07,1.550000
2009-03-24,0.661000
2017-09-22,0.972000
2013-03-21,0.931000
1999-03-29,0.500000
2015-09-23,0.916000
2022-06-23,2.062000
1997-09-11,0.787000
2011-12-15,1.049000
2024-12-16,27.751000
1996-10-01,3.114000