f/overrides/event-backup/dfcsx-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
1997-12-22,0.135000
2010-06-08,0.189000
2014-06-09,0.341000
2016-06-29,0.315000
2016-12-15,0.071000
1988-12-13,0.009000
2016-03-30,0.042000
2020-06-29,0.131000
2021-06-29,0.285000
1993-11-16,0.014000
1996-12-27,0.116000
2005-12-19,1.663000
2006-12-18,0.611000
2017-12-15,0.282000
2024-09-27,0.156000
1992-12-15,0.032000
1994-11-28,0.020000
2002-12-16,0.647000
2022-12-14,0.155000
2019-06-27,0.401000
2020-12-16,0.217000
1990-12-11,0.065000
2000-12-18,1.783000
2004-12-20,0.698000
2008-09-09,0.119000
2013-12-12,0.041000
2018-12-18,0.842000
2025-06-27,0.544000
2010-04-30,0.058000
2011-09-08,0.089000
2011-12-13,0.044000
2014-09-09,0.057000
2022-09-29,0.097000
2017-03-30,0.010000
2017-06-29,0.309000
1991-12-11,0.260000
1998-12-21,0.211000
2001-12-17,1.272000
2007-06-08,0.199000
2009-03-10,0.004000
2012-03-08,0.010000
2021-12-15,0.981000
2024-12-13,0.757000
2026-06-29,0.536000
2025-09-29,0.270000
1989-12-12,0.047000
1995-11-27,0.031000
2006-06-08,0.166000
2016-09-29,0.013000
2023-12-13,0.171000
2024-06-27,0.512000
1991-01-25,0.001000
1995-12-27,0.075000
1999-12-20,2.278000
2012-12-13,0.074000
2013-09-10,0.045000
2018-06-28,0.425000
2022-06-29,0.400000
2023-09-28,0.137000
2006-09-08,0.073000
2008-12-10,0.010000
2009-12-09,0.056000
2012-09-10,0.034000
2015-09-09,0.070000
2017-09-28,0.034000
2019-12-17,0.127000
2007-09-10,0.107000
2008-06-10,0.334000
2009-06-09,0.211000
2009-09-09,0.058000
2015-12-16,0.040000
2018-09-27,0.095000
2025-12-15,0.346000
2004-09-08,0.054000
2005-09-08,0.050000
2010-09-08,0.006000
2015-06-08,0.302000
2019-09-27,0.068000
2023-06-29,0.549000
1993-12-15,0.008000
2021-09-29,0.066000
2013-06-10,0.281000
2014-12-16,0.041000
2004-06-08,0.035000
2005-06-08,0.080000
2007-12-19,0.966000
2008-03-10,0.008000
2011-06-08,0.278000
2012-06-08,0.285000
2010-12-09,0.093000
2020-09-29,0.119000
1991-12-10,0.096000
2003-12-22,2.202000