f/overrides/event-backup/bto-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
2015-09-09,0.370000
2016-06-09,0.370000
2017-09-08,0.370000
1998-12-17,1.248000
2003-12-16,2.532000
2005-03-10,1.148000
2005-09-08,0.152000
2013-12-10,0.296000
2018-09-13,0.370000
2021-09-10,0.550000
2021-06-10,0.550000
2024-03-08,0.650000
2007-03-08,1.068000
2009-06-09,0.050000
2010-06-09,0.252000
2018-03-09,0.370000
2022-09-09,0.650000
2007-09-10,1.068000
2011-12-08,0.196000
2020-12-10,0.550000
2021-12-10,0.550000
2020-06-10,0.550000
2024-06-13,0.650000
2013-03-07,0.296000
2016-03-09,0.370000
2019-06-12,0.550000
2020-03-11,0.550000
2023-12-08,0.650000
2024-12-12,0.650000
2004-09-09,1.080000
2012-03-08,0.213000
2012-12-11,0.296000
2019-03-08,0.550000
2010-12-09,0.211000
2025-06-12,0.650000
1997-12-18,2.940000
2006-03-09,0.160000
2008-12-11,0.692000
2010-09-09,0.223000
2023-03-10,0.650000
2025-12-11,0.650000
1996-10-15,16.000000
2005-12-08,0.160000
2011-03-09,0.238000
2021-03-10,0.550000
2009-03-10,0.430000
2016-12-08,0.370000
2016-09-08,0.370000
2017-12-08,0.370000
2022-03-10,0.550000
2023-06-09,0.650000
2000-12-19,3.100000
2008-06-09,0.692000
2011-06-09,0.238000
2014-06-10,0.296000
2026-06-11,0.650000
2012-06-07,0.234000
2015-12-09,0.370000
2001-12-18,4.868000
2004-03-11,1.080000
2004-12-09,1.080000
2010-03-18,0.222000
2020-09-10,0.550000
2022-06-10,0.650000
2023-09-08,0.650000
2025-03-13,0.650000
1998-10-08,4.000000
2014-12-09,0.296000
2015-06-09,0.296000
2017-06-08,0.370000
2026-03-12,0.650000
2011-09-08,0.219000
2014-03-11,0.296000
2015-03-10,0.296000
2018-12-12,0.550000
1996-12-19,0.252000
2002-12-17,3.436000
2006-12-07,1.140000
2007-06-07,1.068000
2019-09-12,0.550000
2019-12-11,0.550000
2024-09-13,0.650000
2008-03-10,0.692000
2009-09-09,0.060000
2014-09-10,0.296000
2022-12-09,0.650000
1995-12-20,0.120000
1999-12-16,2.800000
2005-06-09,1.148000
2007-12-10,3.876000
2025-09-12,0.650000
2008-09-12,0.692000
2009-12-09,0.032000
2013-06-11,0.296000
2018-06-08,0.370000
2013-09-11,0.296000
2017-03-09,0.370000
2004-06-10,1.080000
2006-06-08,1.044000
2006-09-07,1.044000
2012-09-12,0.296000