f/overrides/event-backup/nbrvx-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
2004-12-16,1.159086
2006-12-15,0.104188
2008-12-15,0.549990
2013-12-16,1.202164
2016-12-16,0.108195
2025-12-15,2.949000
2005-12-15,1.369465
2009-12-16,0.084151
2010-12-17,0.017031
2012-12-14,0.125225
2014-12-15,2.297135
2015-12-17,2.234022
2017-12-15,1.554798
2019-12-16,0.229000
2023-12-15,0.495000
1999-12-13,0.020036
2007-12-17,1.948507
2021-12-14,0.142000
2024-12-16,1.626000
2011-12-16,0.061110
2018-12-17,1.639000
2020-12-14,0.008000
2022-12-15,0.210000