f/overrides/event-backup/cpoax-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
2017-12-15,9.013000
2018-06-22,0.154000
2014-12-15,2.282000
2017-06-23,0.174000
2015-12-15,2.815000
2016-12-15,2.734000
2019-06-21,0.128000
2019-12-13,2.844000
2021-12-13,9.843000
2024-12-11,0.233000
1999-12-16,0.884000
2003-01-31,0.045000
2012-12-14,3.214000
2014-06-23,0.132000
2015-06-23,0.013000
2020-12-14,7.324000
2022-12-12,8.958000
2003-02-26,0.044000
2010-04-30,0.018000
2018-12-14,2.921000
1999-06-23,0.004000
2013-12-13,2.969000