f/overrides/event-backup/biiex-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
2025-06-30,0.395000
2014-06-30,0.196000
2016-06-30,0.191000
2017-09-29,0.071000
2018-06-29,0.229000
2015-03-31,0.067000
2022-03-31,0.039000
2022-09-30,0.101000
2008-12-29,1.646000
2012-12-06,0.496000
2013-06-28,0.279000
2014-09-30,0.059000
2020-03-31,0.082000
2021-03-31,0.112000
2023-09-29,0.041000
2002-12-16,0.609000
2007-12-27,3.741000
2017-03-31,0.073000
2020-12-31,0.031000
2004-12-16,1.012000
2024-12-31,0.255000
2016-09-30,0.076000
2019-09-30,0.148000
2020-06-30,0.171000
1998-12-17,1.485000
1999-12-16,1.827000
2003-12-16,0.132000
2010-12-31,0.347000
2023-12-29,0.119000
2025-12-31,0.222000
1997-12-17,0.227000
2013-09-30,0.069000
2014-12-31,0.013000
2019-06-28,0.275000
2018-12-31,0.120000
2021-12-31,0.222000
2024-06-28,0.365000
2005-12-16,1.706000
2006-12-19,2.595000
2011-12-06,0.658000
2015-09-30,0.091000
2021-06-30,0.276000
2014-03-31,0.093000
2019-03-29,0.109000
2022-12-30,0.067000
2026-06-30,0.457000
2015-12-31,0.069000
2016-12-30,0.245000
2025-12-10,0.989000
2023-06-30,0.347000
2025-09-30,0.083000
2009-12-30,0.262000
2018-03-29,0.011000
2018-09-28,0.085000
2021-09-30,0.078000
2001-12-14,0.963000
2016-03-31,0.053000
2022-06-30,0.361000
2017-06-30,0.177000
2019-12-31,0.119000
2020-09-30,0.025000
2000-12-14,4.673000
2001-12-31,0.226000
2013-12-31,0.018000
2015-06-30,0.155000