f/overrides/event-backup/jmvsx-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
2006-12-15,1.169000
2008-12-18,0.692000
2009-06-23,0.314000
2012-12-13,0.219000
2012-12-18,0.350000
2020-12-18,0.376000
2023-12-20,0.423000
2002-12-20,0.058000
2005-12-15,0.726000
2007-12-20,0.180000
2008-12-22,0.128000
2010-12-20,0.239000
2016-12-20,0.240000
2025-12-11,6.391000
2004-12-14,0.462000
2005-12-27,0.162000
2011-12-20,0.231000
2023-12-13,1.715000
2002-07-31,0.013000
2015-12-21,0.230000
2016-12-14,2.245000
2018-12-19,0.478000
2019-12-12,1.548000
2021-12-13,5.897000
2007-12-17,2.060000
2013-12-12,1.455000
2014-12-12,2.793000
2014-12-22,0.293000
2017-12-13,0.768000
2018-12-12,2.159000
2020-12-11,2.404000
2003-12-16,0.231000
2015-12-11,1.954000
2017-12-20,0.277000
2019-12-19,0.429000
2025-12-18,0.320000
2006-12-22,0.306000
2013-12-20,0.222000
2021-12-20,0.244000
2022-12-13,3.593000
2004-08-31,0.009000
2005-08-30,0.094000
2006-08-30,0.217000
2009-12-21,0.005000
2022-12-20,0.370000
2024-12-12,4.080000
2024-12-19,0.335000