f/overrides/event-backup/caf-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
2010-09-28,1.558000
2012-03-29,2.039000
2017-12-21,1.183000
2018-10-18,0.851000
2019-12-19,0.821000
2024-12-13,0.327000
2007-06-27,0.630000
2009-12-30,4.263000
2025-12-19,0.263000
2014-09-26,0.768000
2023-12-14,0.122000
2021-12-16,1.340000
2008-12-29,1.831000
2020-12-17,2.305000
2010-12-28,0.165000
2011-09-28,0.367000
2013-12-24,0.112000
2014-12-24,0.950000
2015-09-17,4.830000
2015-12-29,8.514000
2007-12-27,8.973000
2008-07-09,4.027000
2018-12-20,0.879000
2022-12-15,0.003000
2016-09-28,0.797000
2017-06-28,0.034000