f/overrides/event-backup/mapax-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
2006-12-19,0.089000
2007-12-12,0.218000
2008-12-11,0.318000
2022-12-07,1.588000
2021-12-02,25.777000
2024-12-09,1.570000
2001-12-18,0.164000
2006-12-12,3.062000
2009-10-21,0.217000
2013-12-18,1.349000
2010-12-30,0.024000
2017-12-05,4.585000
2004-12-13,1.306000
2007-12-07,4.546000
2023-12-06,1.261000
2018-12-03,4.096000
2025-12-04,2.405000
2002-06-28,0.030000
2005-12-08,2.131000
2014-12-04,4.372000
2016-12-05,0.870000
2020-12-02,1.674000
2010-12-13,0.240000
2011-12-07,0.359000
2012-12-07,0.388000
2015-12-03,7.094000
2000-12-19,3.155000
2002-12-19,0.140000
2019-12-02,3.506000