f/overrides/event-backup/ivinx-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
1996-12-31,0.828000
2021-12-16,4.153000
2022-12-15,21.520000
1989-12-29,1.006000
1991-12-30,0.480000
1994-12-28,0.991000
1995-06-28,0.065000
2009-12-10,0.239000
1993-12-29,0.282000
1995-12-27,0.207000
2002-12-20,0.003000
2005-12-15,0.170000
2015-12-10,0.935000
2018-12-13,4.771000
1994-06-28,0.052000
1999-12-23,2.724000
2000-05-31,4.260000
2006-12-14,0.048000
2007-12-13,0.071000
2013-12-12,0.462000
2020-12-10,2.822000
1987-12-31,0.050000
1994-09-28,0.066000
1995-03-29,0.060000
1997-12-23,0.571000
1995-09-27,0.069000
2019-12-12,0.444000
2010-12-09,0.620000
2014-12-11,0.538000
2017-12-14,3.403000
2023-12-15,1.913000
1994-03-29,0.070000
1998-12-23,0.695000
2000-12-22,8.647000
2008-12-11,0.263000
2024-12-13,1.361000
2025-12-12,3.391000
1988-12-30,0.114000
1990-12-28,0.695000
1992-12-29,0.503000
2012-12-13,0.286000