f/overrides/event-backup/nctwx-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
1994-12-27,2.100000
1998-12-23,4.139000
2001-12-21,0.577000
2007-12-27,2.666000
2015-12-28,1.567000
2023-12-27,0.237000
1984-10-16,0.093000
1987-12-15,0.136000
2000-12-21,13.120000
2005-12-28,0.008000
2016-12-27,1.250000
2018-12-26,2.937000
2020-12-28,1.196000
2022-12-28,1.079000
1988-12-15,0.415000
1999-12-23,0.010000
2003-12-26,0.002000
2009-12-29,0.096000
2014-12-26,3.584000
2021-12-28,3.443000
1989-12-15,0.981000
1992-12-29,1.035000
1995-12-26,2.673000
1996-12-26,3.240000
2008-12-26,1.228000
2010-12-27,0.470000
2025-12-29,3.642000
1987-10-27,1.505000
1991-12-23,0.649000
1993-12-28,1.670000
2017-12-26,3.049000
1990-12-21,0.499000
1997-12-26,5.309000
2011-12-22,0.589000
2013-12-27,2.134000
1985-10-18,0.163000
1986-10-23,0.420000
2004-12-27,0.915000
2006-12-27,1.110000
2012-12-28,2.018000
2019-12-26,3.215000
2024-12-27,1.734000