f/overrides/event-backup/fiasx-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
2024-12-13,0.719000
2005-12-09,2.938000
2007-12-07,5.202000
2009-12-04,0.397000
2015-12-04,0.871000
2018-12-07,1.383000
2021-12-28,0.118000
2006-12-08,5.650000
2012-12-07,0.401000
2019-12-06,0.582000
2020-12-04,0.169000
2023-12-08,0.499000
2023-12-27,0.013000
2025-12-12,1.228000
2004-12-10,0.790000
2010-04-23,0.025000
2010-12-03,0.677000
2011-12-02,0.380000
2016-12-09,0.565000
2021-12-03,2.153000
2003-12-12,0.330000
2013-12-06,0.648000
2014-12-05,3.611000
2017-12-08,0.967000
2022-12-09,0.111000