f/overrides/event-backup/dfemx-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
2021-09-29,0.329000
2006-12-18,0.279000
2007-03-08,0.009000
2008-03-10,0.053000
2009-12-09,0.476000
2017-06-29,0.110000
1996-12-27,0.094000
2009-09-09,0.132000
2016-12-15,0.131000
2018-12-18,0.163000
2025-12-15,0.312000
2016-09-29,0.099000
2019-09-27,0.381000
2020-06-29,0.139000
1997-12-22,0.263000
2000-12-18,0.055000
2005-03-08,0.022000
2008-06-10,0.247000
2014-12-16,0.131000
2020-09-29,0.212000
2023-12-13,0.366000
2025-03-28,0.057000
2019-06-27,0.138000
2019-12-17,0.161000
2021-06-29,0.196000
2004-06-08,0.110000
2005-09-08,0.118000
2005-12-19,0.230000
2009-06-09,0.141000
2015-09-09,0.202000
2023-06-29,0.236000
2024-03-27,0.046000
2008-12-10,0.349000
2010-03-09,0.049000
2021-03-30,0.035000
2022-09-29,0.446000
2024-12-13,0.309000
2001-12-17,0.119000
2004-12-20,0.106000
2014-09-09,0.256000
1995-12-27,0.004000
1998-12-21,0.093000
1999-12-20,0.095000
2009-03-10,0.035000
2013-03-08,0.025000
2022-06-29,0.247000
2026-06-29,0.219000
2005-06-08,0.183000
2011-12-13,1.203000
2012-06-08,0.151000
2012-12-13,0.385000
2026-03-30,0.055000
2021-12-15,1.373000
2002-12-16,0.117000
2010-09-08,0.161000
2014-06-09,0.120000
2017-09-28,0.253000
2020-12-16,0.091000
2013-06-10,0.200000
2015-12-16,0.141000
2024-09-27,0.369000
2025-09-29,0.315000
2024-06-27,0.172000
2003-12-22,0.153000
2007-09-10,0.179000
2008-09-09,0.234000
2010-12-09,1.912000
2022-12-14,0.276000
2020-03-30,0.031000
2022-03-30,0.016000
2025-06-27,0.262000
2006-03-08,0.018000
2013-09-10,0.168000
2013-12-12,0.313000
2016-03-30,0.075000
2018-09-27,0.283000
1995-11-27,0.049000
2004-09-08,0.070000
2015-06-08,0.086000
2018-06-28,0.107000
2017-12-15,0.168000
2023-03-30,0.029000
2023-09-28,0.289000
2006-06-08,0.157000
2006-09-08,0.179000
2007-06-08,0.217000
2010-06-08,0.186000
2012-09-10,0.190000
2007-12-19,1.501000
2011-06-08,0.175000
2011-09-08,0.214000
2016-06-29,0.132000