f/overrides/event-backup/cfimx-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
2016-12-13,0.602000
2024-12-13,1.234000
2021-12-09,1.325800
1992-12-18,0.397200
1998-12-28,0.299000
2010-04-30,0.003300
2023-12-08,0.427000
2019-12-12,0.179500
1991-12-20,0.315400
1995-12-28,0.617600
1996-12-27,0.510800
2000-12-29,1.025000
2011-12-21,0.087000
1984-12-27,0.049000
1987-12-22,0.180000
2008-12-30,0.085200
2018-06-27,0.466500
2018-12-12,0.505600
2024-06-14,0.595000
1997-12-29,1.118900
1999-12-27,0.840400
2002-12-23,0.319300
2012-12-18,0.134300
2015-12-10,0.074000
1994-12-29,0.270700
2005-12-19,0.129300
2006-12-28,0.460500
1990-12-19,0.135700
2009-12-01,0.045600
2013-12-19,0.034500
2022-06-28,0.416000
2022-12-09,0.179000
1988-12-20,0.095000
1998-08-28,1.150400
2003-12-19,0.234900
2007-12-28,1.101800
2025-12-12,0.500000
1993-12-30,0.747900
2016-07-01,0.532000
2017-06-28,0.236000
2023-06-27,0.361000
2014-12-11,0.041400
2021-06-23,0.554600
2010-12-01,0.063200
1989-12-19,0.100000
2006-04-24,0.450000
2017-12-13,0.480900
2026-06-24,0.888000
1987-01-23,0.148000
2001-12-31,0.382300
2004-12-20,0.337500
2020-12-10,0.323200
2025-06-25,0.820000
1985-12-20,0.084000