f/overrides/event-backup/csmix-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
2000-12-12,1.394000
2008-12-08,1.941000
2010-12-30,0.050000
2012-12-27,0.092000
2021-12-07,4.067000
2022-12-07,0.132000
2003-12-16,1.183000
2004-12-13,3.622000
2007-12-10,4.346000
2018-12-06,2.125000
1988-06-29,0.024000
1989-06-29,0.040000
1995-12-08,0.008000
1996-12-09,0.980000
1997-12-08,2.050000
2010-12-07,0.542000
2015-11-06,4.510000
2016-06-27,2.339000
2016-12-07,2.441000
2022-06-22,2.167000
2023-06-22,0.693000
2023-12-07,2.543000
2025-06-24,1.373000
2025-12-05,4.795000
1986-10-15,0.010000
1987-07-15,0.010000
1990-12-20,0.018000
2006-12-11,3.603000
2011-12-06,2.880000
2017-12-06,2.038000
2020-06-19,0.047000
1988-12-28,0.020000
2019-12-05,0.280000
2026-06-22,2.943000
1987-12-15,0.040000
2005-12-12,1.972000
2009-12-07,0.178000
2014-12-05,6.647000
2019-06-18,1.031000
2020-12-07,0.149000
2024-12-06,1.043000
1987-01-15,0.020000
1989-12-20,0.025000
1990-06-28,0.020000
1991-06-28,0.025000
2012-12-07,1.784000
2013-12-05,7.533000
2018-06-21,0.956000
2021-06-24,1.887000
2001-12-11,2.165000
2017-06-21,2.797000
2024-06-24,1.857000