f/overrides/event-backup/chclx-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
2014-12-17,0.706000
2018-12-11,1.769000
1989-06-23,0.040000
1992-12-31,0.025000
1999-12-15,0.638000
1996-12-16,1.075000
1997-12-15,2.169000
1998-12-16,0.385000
1990-06-19,0.040000
1991-06-21,0.035000
1994-12-15,0.014000
1987-07-20,0.040000
1990-01-02,0.080000
2015-12-16,0.508000
1986-01-14,0.035000
1991-12-31,0.030000
1993-06-23,0.018000
2007-11-16,0.860000
2017-12-13,0.733000
2019-12-10,0.709000
1987-01-15,0.050000
1988-06-21,0.040000
1992-06-23,0.025000
1995-12-15,0.020000
2000-12-15,0.293000
2013-12-16,0.533000
2025-12-09,1.306000
1988-12-30,0.040000
1990-12-31,0.055000
1993-12-31,0.001000
2006-11-17,0.584000
2020-12-08,2.121000
1986-07-14,0.060000
1987-12-31,0.043000
2005-11-18,0.594000
2021-12-07,2.317000