f/overrides/event-backup/ffnox-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
2023-12-28,1.726000
2004-04-02,0.040000
2006-12-28,0.590000
2010-12-30,0.536000
2011-12-29,0.641000
2015-12-29,0.870000
2021-12-30,3.134000
2003-12-26,0.320000
2009-12-28,0.505000
2018-12-28,0.980000
2022-04-08,1.859000
2026-04-10,0.240000
2023-04-14,0.005000
2004-12-29,0.400000
2005-04-08,0.010000
2006-04-07,0.270000
2011-04-15,0.015000
2012-12-28,0.657000
2017-12-28,0.888000
2002-12-27,0.350000
2003-04-04,0.020000
2017-04-12,0.221000
2021-04-09,0.364000
1999-12-22,0.240000
2002-04-05,0.030000
2008-04-11,0.135000
2013-12-27,0.719000
2016-04-15,0.159000
2025-04-11,0.987000
2019-04-12,0.261000
2020-12-30,1.444000
2001-04-06,0.080000
2001-12-28,0.400000
2005-12-29,0.450000
2007-04-13,0.100000
2012-04-13,0.014000
2016-12-28,0.798000
2024-04-12,0.980000
2025-12-30,1.467000
2008-12-26,0.605000
2009-04-17,0.020000
2013-04-12,0.011000
2015-04-10,0.134000
2022-12-29,1.500000
2024-12-30,2.733000
2020-04-08,0.142000
2000-12-29,0.590000
2007-12-28,0.740000
2014-04-11,0.075000
2014-12-29,0.839000
2018-04-11,0.189000
2019-12-30,1.191000