f/overrides/event-backup/ewk-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
2001-12-24,0.070000
2015-06-25,0.289000
1998-12-22,0.730000
2006-12-20,0.441000
2009-12-22,0.044000
2010-12-21,0.092000
2014-06-25,0.226000
2005-12-23,0.813000
2019-12-16,0.206000
2009-06-23,0.187000
2004-12-23,0.285000
2007-12-20,0.719000
1999-08-25,2.113000
2003-12-16,0.110000
2008-06-25,1.042000
2023-12-20,0.060000
1996-08-26,0.691000
2024-12-17,0.227000
2021-06-10,0.252000
2013-12-18,0.384000
1997-08-25,0.726000
2008-12-23,0.150000
2012-12-18,0.021000
2015-12-21,0.083000
2018-06-19,0.357000
2023-06-07,0.333000
2025-12-16,0.161000
1997-12-23,0.175000
2014-12-17,0.073000
2020-06-15,0.150000
2024-06-11,0.368000
2025-06-16,0.261000
2026-06-15,0.332000
2012-06-21,0.354000
2001-08-24,0.232000
2002-12-23,0.114000
2003-12-22,1.006000
2016-06-22,0.147000
1996-12-23,0.012000
2011-06-22,0.243000
2017-12-19,0.264000
2021-12-13,0.524000
2011-12-20,0.324000
2018-12-18,0.096000
2019-06-17,0.348000
2020-12-14,0.175000
2022-06-09,0.463000
2000-08-24,0.359000
2000-12-20,0.036000
2017-06-20,0.347000
1998-08-25,3.570000
2010-06-23,0.152000
2013-06-27,0.373000
2016-12-21,0.159000