f/overrides/event-backup/fgsax-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
1997-11-14,6.391000
1999-11-15,4.328000
2020-12-04,3.533000
1987-12-23,0.044000
1990-09-24,0.200000
1991-03-25,0.150000
1984-09-21,0.094000
1986-06-23,0.068000
1984-12-21,0.053000
2016-12-12,0.320000
2022-12-06,0.821000
1987-09-23,0.060000
2002-07-31,0.001000
2009-12-29,0.085000
2000-11-15,2.692000
2002-10-31,0.001000
2013-12-12,6.000000
2014-12-11,6.708000
2024-12-10,2.492000
1987-06-23,0.070000
1994-09-26,0.060000
1996-03-25,0.010000
1987-03-23,0.055000
2019-12-05,3.223000
1992-03-24,0.070000
1994-03-24,0.040000
2007-11-14,4.254000
1988-06-23,0.080000
1989-09-25,0.260000
1993-12-20,0.040000
1994-12-19,0.115000
1986-03-21,0.064000
1990-03-26,0.200000
1993-09-24,0.040000
1992-12-18,0.080000
1991-06-24,0.150000
1992-09-24,0.070000
1995-03-24,0.055000
1995-09-25,0.040000
1985-06-21,0.065000
1985-09-23,0.082000
1988-03-23,0.030000
1985-12-23,0.077000
1986-09-23,0.070000
1991-12-20,0.120000
1992-06-24,0.070000
1993-06-24,0.050000
1995-12-18,0.030000
1996-12-12,2.824000
2017-12-11,5.500000
1988-09-23,0.070000
1988-12-20,0.112000
1989-06-26,0.070000
2018-12-10,4.851000
1989-03-27,0.080000
1990-12-21,0.200000
1995-06-26,0.045000
1990-06-25,0.200000
1991-09-24,0.115000
1993-03-24,0.060000
1994-06-24,0.050000
2002-06-28,0.001000
1985-03-22,0.062000
1986-12-23,0.062000
1989-12-21,0.190000
2015-12-10,8.407000
2021-12-06,12.418000
2025-12-10,2.995000