f/overrides/event-backup/csuax-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
2021-06-30,0.162000
2009-06-30,0.149000
2015-06-30,0.167000
2017-12-06,0.873000
2005-03-18,0.085000
2005-12-23,0.105000
2022-06-30,0.273000
2004-09-17,0.085000
2005-09-27,0.085000
2013-06-28,0.144000
2023-12-07,0.206000
2025-06-30,0.919000
2012-06-29,0.153000
2021-12-09,0.556000
2006-06-23,0.070000
2011-12-15,0.132000
2013-12-12,0.084000
2020-06-30,0.177000
2024-06-28,0.269000
2011-06-30,0.135000
2018-12-06,0.200000
2019-12-04,0.157000
2016-12-08,0.147000
2026-06-30,0.959000
2020-12-10,0.096000
2007-03-30,0.037000
2008-03-31,0.045000
2014-06-30,0.159000
2016-06-30,0.201000
2022-12-08,0.496000
2005-06-24,0.085000
2007-06-29,0.068000
2007-12-31,2.924000
2014-12-11,0.088000
2017-06-30,0.231000
2019-06-28,0.172000
2006-12-22,1.368000
2009-12-17,0.068000
2010-12-16,0.170000
2015-12-10,0.831000
2006-03-24,0.070000
2006-09-28,0.070000
2007-09-28,0.043000
2010-04-30,0.035000
2010-06-30,0.126000
2025-12-08,1.036000
2008-06-30,0.191000
2012-12-13,0.110000
2024-12-04,0.887000
2004-12-23,0.085000
2008-12-19,0.165000
2018-06-29,0.446000
2023-06-30,0.264000