f/overrides/event-backup/iysyx-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
2014-12-11,1.842000
2024-03-22,0.070000
2026-06-22,0.007000
2016-12-08,0.831000
2023-09-22,0.005000
2025-06-20,0.013000
2025-09-22,0.007000
2025-12-12,0.276000
2004-12-16,1.188000
2021-12-16,3.786000
2024-06-21,0.008000
2024-09-20,0.015000
2011-12-08,1.515000
2017-12-14,0.429000
2022-12-15,3.776000
2025-03-21,0.012000
2015-12-10,2.154000
2022-09-15,0.017000
2023-03-22,0.018000
2026-03-20,0.009000
2005-12-15,3.152000
2007-12-13,0.934000
2019-12-12,0.121000
2018-12-13,2.406000
2023-12-15,0.009000
2006-12-14,1.342000
2012-12-13,0.596000
2013-12-12,2.386000
2023-06-22,0.018000