f/overrides/event-backup/dfigx-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
2013-03-08,0.052000
2017-03-30,0.059000
1994-11-28,0.158000
2006-09-08,0.122000
1998-09-09,0.163000
1999-12-20,0.235000
2006-06-08,0.121000
2018-03-28,0.054000
2022-06-29,0.048000
1995-06-08,0.174000
1997-06-10,0.167000
2006-12-18,0.172000
2021-09-29,0.045000
2024-03-27,0.064000
1991-12-10,0.331000
2005-12-19,0.229000
2009-03-10,0.082000
2011-06-08,0.107000
2012-09-10,0.087000
2013-06-10,0.076000
2014-09-09,0.066000
2015-12-15,0.131000
1999-06-08,0.155000
2005-06-08,0.130000
2017-09-28,0.060000
2025-06-27,0.086000
2015-09-09,0.068000
2019-03-28,0.059000
2002-09-10,0.161000
2006-03-08,0.081000
2009-06-09,0.128000
2023-06-29,0.055000
1992-03-09,0.125000
2002-03-08,0.103000
2013-09-10,0.074000
1996-09-10,0.161000
2001-06-08,0.163000
2008-03-10,0.086000
2010-06-08,0.120000
2012-12-12,0.136000
2017-12-14,0.082000
1991-09-09,0.205000
1995-09-08,0.191000
2020-12-14,0.371000
2021-03-30,0.041000
2004-06-08,0.141000
2016-09-29,0.050000
2022-03-30,0.043000
1992-06-08,0.243000
1993-06-08,0.182000
2012-03-08,0.061000
2019-09-27,0.070000
1995-12-27,0.114000
2010-12-09,0.198000
2000-03-08,0.104000
2007-06-08,0.126000
2008-06-10,0.129000
2010-09-08,0.123000
2011-03-08,0.072000
2011-12-12,0.226000
1991-03-08,0.150000
1993-12-15,0.229000
2024-09-27,0.074000
2014-06-09,0.073000
2018-12-17,0.080000
2000-09-08,0.163000
2005-03-08,0.079000
2007-09-10,0.129000
2015-03-09,0.043000
2018-06-28,0.066000
2020-06-29,0.064000
1992-09-09,0.135000
1993-03-09,0.116000
2022-12-12,0.054000
2026-06-29,0.089000
2004-12-20,0.219000
2025-03-28,0.071000
1995-11-27,0.231000
2003-09-09,0.149000
2002-12-16,0.421000
2021-12-13,0.166000
1995-03-08,0.109000
1998-12-21,0.260000
2016-06-29,0.061000
2023-09-28,0.069000
1994-09-08,0.183000
1994-12-28,0.074000
2003-12-22,0.476000
2014-12-15,0.155000
2015-06-08,0.068000
2020-09-29,0.054000
2023-12-11,0.079000
1998-06-09,0.155000
2002-06-10,0.158000
2008-12-10,0.248000
2011-09-08,0.107000
2022-09-29,0.048000
1997-09-09,0.168000
1999-09-08,0.153000
1996-12-27,0.215000
2007-12-19,0.177000
1994-03-08,0.108000
1994-06-08,0.166000
2013-12-11,0.103000
2024-06-27,0.076000
2025-12-10,0.094000
1993-11-16,0.180000
2009-09-09,0.123000
1999-03-09,0.094000
2004-03-09,0.085000
2019-06-27,0.071000
1990-12-11,0.157000
1998-03-10,0.107000
2010-03-09,0.074000
2026-03-30,0.078000
1996-03-08,0.107000
2007-03-08,0.083000
2020-03-30,0.065000
2001-03-08,0.105000
2004-09-08,0.139000
2019-12-16,0.077000
2021-06-29,0.046000
2001-12-17,0.219000
2003-06-10,0.176000
1992-12-15,0.340000
2003-03-10,0.099000
1997-12-22,0.274000
2009-12-09,0.213000
1991-06-10,0.207000
1997-03-10,0.107000
1993-09-08,0.184000
2005-09-08,0.133000
2025-09-29,0.085000
2000-06-08,0.160000
2017-06-29,0.063000
2012-06-08,0.091000
2016-12-14,0.106000
2018-09-27,0.067000
2023-03-30,0.054000
1996-06-10,0.162000
2001-09-10,0.159000
2024-12-10,0.090000
2000-12-18,0.215000
2016-03-30,0.062000
2008-09-09,0.130000
2014-03-10,0.047000