f/overrides/event-backup/dboax-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
2021-03-29,0.125000
2022-03-29,0.228000
2008-12-31,0.382000
2020-12-16,0.859000
2023-12-14,1.044000
2025-12-18,1.966000
2007-12-31,3.531000
2010-12-31,0.237000
2023-03-28,0.151000
2004-12-30,0.305000
2014-12-31,1.900000
2024-03-26,0.038000
2026-03-27,0.339000
2006-06-29,0.004000
2010-04-29,0.042000
2011-12-30,0.234000
2016-12-30,0.233000
2019-12-31,0.713000
2009-12-31,0.255000
2012-12-31,0.234000
2015-12-31,1.165000
2017-12-29,1.135000
2018-12-31,1.886000
2021-12-15,2.960000
2005-12-30,0.445000
2019-03-20,0.061000
2020-03-25,0.105000
2024-12-17,1.388000
2006-12-29,0.323000
2013-12-31,0.464000
2022-12-14,0.913000
2025-03-27,0.068000