f/overrides/event-backup/mndax-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
2021-12-07,7.396000
2022-12-06,0.023000
2003-01-31,0.039000
2007-12-11,0.659000
2010-12-09,1.410000
2017-12-12,2.809000
2019-12-10,2.242000
2003-02-28,0.039000
2011-12-08,4.096000
2013-12-10,2.449000
2020-12-08,3.894000
2018-12-11,5.615000
1997-10-31,0.724000
1998-12-10,0.137000
1999-12-10,0.606000
2000-12-11,3.613000
2004-08-31,0.014000
2014-12-11,1.818000
2016-12-13,0.584000