f/overrides/event-backup/auiax-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
2010-12-22,0.095000
1996-09-17,0.100000
2004-09-23,0.060000
2022-03-08,0.050000
2022-09-06,0.108000
1995-03-23,0.111000
2004-12-21,0.193000
2012-09-13,0.136000
2003-06-24,0.060000
2003-03-25,0.060000
2019-09-04,0.127000
2021-06-08,0.160000
1997-06-12,0.080000
1999-06-15,0.080000
2000-12-15,0.844000
1996-03-14,0.111000
1996-06-13,0.100000
2001-09-21,0.080000
2012-12-20,0.589000
2018-03-06,0.124000
1994-12-22,0.119000
2018-09-05,0.152000
2022-12-06,1.685000
2000-09-15,0.080000
2002-09-20,0.060000
2007-03-22,0.085000
2024-09-10,0.113000
1994-09-23,0.119000
2011-09-16,0.108000
2014-06-10,0.516000
2016-12-15,0.258000
2019-06-04,0.237000
2009-09-17,0.164000
2007-09-19,0.108000
2008-06-19,0.152000
2008-09-18,0.152000
2022-06-07,0.127000
2023-06-06,0.128000
2006-06-22,0.154000
2005-09-22,0.130000
2025-12-12,2.459000
2001-12-14,0.080000
2000-03-15,0.080000
2014-12-18,2.030000
2016-03-08,0.195000
2026-06-09,0.099000
1996-12-10,0.100000
2003-12-22,0.129000
2004-03-25,0.060000
2005-06-23,0.126000
1999-03-15,0.080000
2007-06-21,0.172000
2009-03-19,0.095000
2010-03-18,0.096000
2010-09-16,0.204000
2019-12-12,1.112000
2025-03-11,0.153000
2000-06-15,0.080000
2005-03-23,0.089000
2012-06-15,0.134000
2015-03-10,0.173000
1999-12-15,1.017000
2005-12-22,0.087000
2015-06-09,0.184000
2021-03-02,0.068000
1998-06-16,0.080000
1998-03-13,0.080000
2008-12-23,0.091000
2009-12-23,0.139000
2024-06-11,0.118000
1997-12-18,0.546000
1995-06-23,0.111000
1995-09-26,0.111000
1997-09-15,0.080000
2002-03-15,0.060000
2013-12-20,2.445000
2016-09-07,0.165000
2020-03-03,0.124000
1993-12-22,0.119000
2008-03-19,0.081000
2006-12-21,0.097000
2018-06-05,0.225000
1998-12-18,0.423000
2001-06-15,0.080000
2013-06-14,0.159000
2013-09-11,0.122000
2015-12-17,0.833000
1998-09-15,0.080000
2016-06-07,0.132000
2021-12-07,4.708000
1994-06-23,0.119000
2011-12-22,0.389000
2023-03-07,0.143000
2025-06-10,0.108000
2010-06-17,0.198000
1997-03-12,0.080000
2002-12-27,0.060000
2004-06-24,0.060000
2006-09-21,0.126000
2012-03-16,0.150000
2013-03-13,0.137000
2015-09-09,0.120000
1994-03-23,0.119000
2023-12-05,0.445000
2009-06-18,0.196000
2011-03-17,0.074000
2014-09-09,0.107000
2018-12-13,2.730000
2020-09-08,0.081000
2023-09-05,0.096000
2001-03-15,0.080000
2017-12-14,1.292000
2003-09-23,0.060000
2017-09-06,0.162000
2020-12-10,0.395000
2021-09-07,0.085000
2024-12-13,3.044000
2017-03-07,0.134000
2002-06-14,0.060000
2007-12-19,0.134000
2011-06-16,0.072000
2017-06-06,0.183000
2020-06-02,0.157000
1999-09-15,0.080000
2006-03-23,0.082000
2019-03-05,0.105000
1995-12-26,0.152000
2024-03-05,0.126000
2025-09-09,0.135000
2026-03-10,0.113000
2014-03-11,0.148000