f/overrides/event-backup/ewq-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
2003-12-16,0.180000
2011-06-22,0.490000
2021-12-13,1.037000
2022-06-09,0.948000
2011-12-20,0.177000
2016-06-22,0.614000
2016-12-21,0.087000
2025-12-16,0.228000
1999-12-21,0.566000
2015-06-25,0.457000
2015-12-21,0.072000
2019-12-16,0.069000
2025-06-16,0.954000
2012-06-21,0.515000
2018-06-19,0.646000
1998-08-25,0.404000
2013-12-18,0.122000
2020-12-14,0.163000
2021-06-10,0.435000
2000-12-20,1.800000
2004-12-23,0.299000
2009-12-22,0.121000
2012-12-18,0.113000
2000-08-24,1.233000
2024-12-17,0.272000
2023-06-07,0.817000
2005-12-23,0.322000
2002-12-23,0.177000
1997-12-23,0.078000
1999-08-25,0.248000
2010-06-23,0.483000
2010-12-21,0.180000
2013-06-27,0.569000
2008-06-25,1.242000
2014-12-17,0.219000
2018-12-18,0.123000
1997-08-25,0.353000
2001-08-24,0.053000
2006-12-20,0.464000
1998-12-22,0.380000
2014-06-25,0.613000
2017-06-20,0.497000
2020-06-15,0.177000
2009-06-23,0.505000
2017-12-19,0.095000
2003-12-22,0.284000
2008-12-23,0.447000
2015-12-29,0.016000
2019-06-17,0.730000
2022-12-13,0.123000
2023-12-20,0.252000
2026-06-15,1.087000
2007-12-20,0.346000
2024-06-11,0.915000
1996-08-26,0.312000