f/overrides/event-backup/mvalx-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
1997-09-23,0.919000
2010-12-15,0.077000
2014-12-17,7.733000
2016-12-20,0.192000
1999-12-29,0.463000
2000-09-26,1.428000
2023-12-21,1.987000
2025-12-19,5.111000
2005-12-15,4.594000
2011-12-15,0.126000
2013-11-13,0.143000
2013-12-17,0.184000
2024-12-20,1.633000
2006-12-15,5.502000
2018-12-20,7.885000
1997-12-29,1.308000
2000-12-21,0.347000
2004-12-15,5.390000
2019-12-20,2.808000
2021-12-21,6.494000
2022-12-21,3.922000
1996-09-20,0.578000
1999-09-30,1.902000
2008-12-16,1.318000
2009-12-22,0.253000
2017-12-20,4.417000
2020-12-18,2.056000
1998-09-23,0.471000
2007-12-18,6.386000
2015-12-17,5.372000