f/overrides/event-backup/mmsix-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
2017-12-28,2.089000
2012-05-01,0.015000
2017-12-29,0.078000
2018-12-14,0.472000
2019-12-30,0.089000
2021-12-30,0.100000
2025-12-30,0.104000
2010-04-30,0.020000
2013-12-26,1.454000
2013-12-30,0.004000
2014-12-26,1.765000
2016-12-28,0.554000
2019-12-16,0.177000
2020-12-16,0.043000
2020-12-30,0.084000
2007-12-31,0.009000
2022-12-16,0.091000
2023-12-28,0.145000
2024-12-30,0.137000
2025-12-15,0.938000
2021-12-15,1.199000
2015-12-28,1.539000
2018-12-31,0.046000
2022-12-29,0.013000
2012-12-26,0.151000