f/overrides/event-backup/dspix-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
2002-06-28,0.001000
2010-05-04,0.100000
2000-11-03,0.080000
2015-05-04,0.199000
2003-12-09,0.103000
2012-12-27,0.185000
2020-12-24,2.396000
2008-08-04,0.159000
2018-08-02,0.238000
2006-05-02,0.106000
1994-11-02,0.065000
1995-12-26,0.065000
2001-05-04,0.062000
2017-05-02,0.201000
2022-05-03,0.231000
1993-11-02,0.010000
2002-08-02,0.072000
2009-03-26,0.012000
2012-05-02,0.123000
2013-12-27,0.192000
2017-08-02,0.230000
2019-12-26,2.245000
1997-12-23,0.323000
1998-05-06,0.101000
2006-11-02,0.121000
2016-11-02,0.212000
2020-04-02,0.037000
1996-12-27,0.250000
2015-08-04,0.201000
2018-12-26,2.325000
2002-05-03,0.067000
2008-11-04,0.119000
2013-11-04,0.157000
2014-08-04,0.182000
2014-11-04,0.181000
2018-11-02,0.246000
2023-11-02,0.222000
2025-05-02,0.169000
1998-12-22,0.230000
2007-11-02,0.144000
2015-12-29,0.492000
2026-08-04,0.129000
2007-05-02,0.127000
2000-05-31,0.070000
2007-12-27,0.159000
2008-05-02,0.136000
2021-12-22,9.179000
1997-05-06,0.080000
2016-08-02,0.202000
2016-12-28,0.684000
2021-11-02,0.239000
2026-05-04,0.122000
2009-08-04,0.102000
2010-12-29,0.108000
2001-12-06,0.085000
2005-12-28,0.125000
2009-11-03,0.120000
2011-08-02,0.117000
2013-08-02,0.153000
1997-11-05,0.080000
2021-08-03,0.238000
2023-08-02,0.220000
2023-12-21,13.665000
2005-11-02,0.104000
2004-08-03,0.073000
2005-08-02,0.104000
2010-08-03,0.105000
2010-11-02,0.123000
2011-05-03,0.118000
2001-11-02,0.073000
2011-12-28,0.015000
2024-11-04,0.190000
2003-11-04,0.085000
2005-05-03,0.081000
2017-11-02,0.237000
2017-12-27,0.685000
2025-11-04,0.152000
2002-11-05,0.062000
2019-11-04,0.261000
1999-05-05,0.080000
2001-08-02,0.070000
2003-08-04,0.072000
2016-05-03,0.214000
2020-11-03,0.234000
2024-12-23,13.734000
2025-12-23,14.713000
1995-05-02,0.078000
2006-12-27,0.143000
1993-12-22,0.010000
1998-11-09,0.080000
2014-12-29,0.187000
2024-05-02,0.192000
1996-05-03,0.075000
2014-05-02,0.167000
2020-05-04,0.265000
2020-08-04,0.240000
1997-08-05,0.080000
2018-05-02,0.232000
2021-05-04,0.241000
2024-08-02,0.190000
2025-08-04,0.157000
1994-08-02,0.066000
1996-08-02,0.095000
2011-11-02,0.115000
2015-11-03,0.204000
2019-05-02,0.253000
2022-08-02,0.250000
1994-05-03,0.074000
2002-10-31,0.001000
1996-11-04,0.060000
2002-12-09,0.085000
2007-08-02,0.133000
2013-05-02,0.144000
1995-11-03,0.065000
2004-05-04,0.073000
2006-08-02,0.129000
2012-08-02,0.139000
2019-08-02,0.246000
1999-12-20,0.314000
2009-05-04,0.115000
2009-12-29,0.096000
2000-08-04,0.070000
1999-11-05,0.060000
2004-11-02,0.071000
2004-12-28,0.223000
1995-08-03,0.066000
1999-08-05,0.050000
2003-05-02,0.065000
2022-11-02,0.237000
2022-12-22,8.983000
2023-05-02,0.230000
1998-08-06,0.090000
2000-12-27,0.120000
2008-12-29,0.439000
2012-11-02,0.136000
1994-12-22,0.047000