f/overrides/event-backup/hiasx-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
1997-02-28,0.500000
2015-08-19,4.361000
2018-08-23,1.481000
2019-08-27,4.240000
2025-08-25,0.079000
1996-09-30,0.050000
1997-12-31,5.750000
1999-12-31,0.290000
2008-12-16,0.016000
2020-08-27,3.322000
2021-08-27,3.386000
2022-08-26,3.655000
1996-10-31,0.050000
1996-11-29,0.040000
1996-12-31,0.010000
1998-02-27,2.000000
2000-06-28,25.010000
2006-12-13,0.041000
2016-08-25,1.683000
1996-08-30,0.080000
2007-12-17,0.047000
2009-08-27,0.002000