f/overrides/event-backup/artsx-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
2015-11-19,2.713000
2016-11-17,0.329000
2017-11-21,4.966000
1997-12-10,2.579000
2004-11-18,0.532000
2008-12-17,0.017000
2005-11-22,0.571000
2007-12-19,1.852000
2021-11-23,5.072000
2020-11-24,2.705000
2024-12-10,1.832000
1998-09-30,0.960000
2000-11-15,0.663000
2019-11-21,2.646000
2006-12-20,0.718000
2018-11-20,5.428000
2022-11-22,0.078000
2025-12-10,2.912000
1996-12-03,1.071000
2001-11-15,0.057000
2002-11-14,0.063000