f/overrides/event-backup/mdy-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
1996-09-20,0.153000
1998-06-19,0.142000
1998-12-18,0.158000
2014-06-20,0.779000
2025-12-19,2.184000
1996-06-21,0.162000
2002-06-21,0.179000
2005-12-16,0.364000
2012-06-15,0.510000
2023-12-15,1.891000
2024-09-20,1.650000
2006-03-17,0.380000
2012-12-21,0.816000
2018-06-15,1.010000
2021-03-19,0.864000
2023-09-15,1.555000
2024-03-15,1.014000
2001-03-16,0.167000
2007-09-21,0.351000
2013-06-21,0.736000
2014-12-19,1.074000
2018-03-16,0.861000
2022-12-16,1.666000
2005-06-17,0.487000
2007-12-21,0.447000
2011-09-16,0.272000
2016-09-16,1.113000
2025-03-21,1.308000
2004-09-17,0.235000
2023-06-16,1.513000
2026-06-18,1.702000
2024-12-20,2.081000
2026-03-20,1.516000
1995-06-16,0.095000
2003-06-20,0.198000
2008-06-20,0.435000
2009-12-18,0.488000
2010-06-18,0.369000
1999-12-20,2.000000
2010-09-17,0.283000
2022-06-17,1.402000
1997-12-19,0.155000
2006-09-15,0.340000
2018-12-21,1.268000
2023-03-17,1.193000
1999-03-19,0.175000
2007-03-16,0.613000
2013-03-15,0.497000
1998-12-21,1.500000
2002-12-20,0.191000
2012-09-21,0.411000
2021-09-17,1.310000
2014-03-21,0.685000
2019-06-21,1.337000
2022-09-16,1.828000
1998-03-20,0.150000
2002-09-20,0.175000
2013-12-20,0.710000
2019-09-20,1.373000
2004-03-19,0.246000
2008-09-19,0.437000
2015-03-20,0.614000
2015-12-18,1.003000
2011-12-16,0.529000
1995-12-28,0.184000
1997-06-20,0.150000
2000-09-14,0.202000
2001-06-15,0.181000
2011-03-18,0.444000
2000-06-16,0.207000
2003-12-19,0.236000
2006-06-16,0.405000
2010-12-17,0.456000
2021-12-17,1.488000
1997-12-24,0.160000
2017-03-17,0.823000
2024-06-21,1.997000
2020-12-18,1.448000
1999-09-17,0.170000
2011-06-17,0.469000
2016-03-18,0.816000
2018-09-21,1.056000
2020-09-18,1.033000
1999-06-18,0.179000
2001-09-21,0.171000
2004-06-18,0.269000
2017-06-16,0.524000
2022-03-18,1.152000
2009-06-19,0.394000
2008-03-20,0.393000
2009-09-18,0.389000
2016-06-17,0.848000
2019-12-20,1.449000
2020-03-20,1.110000
2003-03-21,0.223000
2015-09-18,0.901000
2005-03-18,0.231000
2012-03-16,0.383000
2015-06-19,0.924000
2016-12-16,1.165000
1996-03-15,0.136000
1998-09-18,0.146000
2001-12-21,0.196000
2002-03-15,0.173000
2004-12-17,0.306000
1999-12-17,0.185000
2000-12-15,0.193000
2007-06-15,0.424000
2008-12-19,0.555000
2017-09-15,1.445000
1997-03-21,0.151000
2006-12-15,0.599000
2009-03-20,0.337000
1997-09-19,0.153000
2000-03-17,0.179000
2003-09-19,0.202000
2005-09-16,0.317000
2025-09-19,1.619000
2019-03-15,0.884000
2020-06-19,1.122000
2025-06-20,1.803000
1996-12-20,0.193000
2010-03-19,0.396000
2013-09-20,0.662000
2014-09-19,0.560000
2017-12-15,1.299000