f/overrides/event-backup/grf-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
2006-12-18,0.687000
2007-12-12,0.877000
2008-12-10,0.351000
2023-11-22,0.350000
2025-11-21,0.850000
2006-06-22,0.500000
2011-12-14,1.050000
2012-12-13,0.360000
2017-11-22,0.510000
2021-11-18,0.970000
2022-11-17,0.370000
2004-12-16,0.170435
2005-12-19,0.165000
2009-12-09,0.050000
2010-12-15,0.280000
2018-11-21,0.530000
2020-12-03,0.550000
2013-12-11,1.020000
2014-12-10,0.370000
2015-11-19,0.500000
2016-11-21,0.112000
2019-11-21,0.074000
2024-11-29,0.680000