f/overrides/event-backup/fosfx-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
1987-01-12,1.170000
1995-12-08,0.690000
2000-12-08,4.980000
2007-12-07,6.320000
2013-12-06,0.689000
2025-12-29,0.085000
2025-11-18,3.420000
1994-12-09,0.470000
1997-12-05,1.680000
2003-12-05,0.300000
2006-12-01,5.190000
2011-12-02,0.847000
2018-12-07,2.422000
2002-12-06,0.090000
2004-12-03,0.300000
2005-12-02,0.570000
2008-12-05,0.370000
2024-12-13,0.866000
1993-12-10,0.430000
1996-12-06,2.000000
1998-12-04,0.710000
2009-12-30,0.010000
2016-12-16,0.775000
2019-12-06,0.697000
2012-12-07,0.774000
2014-12-05,0.646000
1986-12-01,2.140000
1987-12-14,8.240000
1989-12-14,1.340000
1992-12-18,2.470000
2009-12-04,0.465000
2010-12-03,0.481000
2014-12-26,0.025000
2015-12-04,0.434000
2017-12-08,0.551000
2022-12-02,0.390000
2023-12-01,0.617000
1988-12-15,0.580000
1990-12-21,1.540000
1991-12-20,1.600000
1999-12-03,3.080000
2020-12-04,0.313000
2021-12-03,3.074000