f/overrides/event-backup/hiscx-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
2015-08-19,3.073000
1995-12-20,0.046000
2005-06-22,0.001000
2008-10-24,0.015000
1999-09-07,0.008000
2001-08-15,0.003000
2005-12-19,0.084000
2006-12-13,0.079000
2016-08-25,1.175000
1994-12-28,0.040000
1996-12-19,0.024000
1998-09-09,0.028000
2018-08-23,2.088000
2019-08-27,5.683000
2022-08-26,4.782000
2025-08-25,5.944000
2009-08-27,0.012000
2020-08-27,1.116000
2024-08-23,0.084000
2017-08-24,0.012000
2021-08-27,3.191000
2007-12-17,0.062000
2008-06-23,0.033000
2008-12-16,0.023000