f/overrides/event-backup/ncbgx-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
2025-04-04,0.782000
2009-09-24,0.288000
2007-06-27,0.499000
2008-12-17,1.220000
2012-03-30,0.503000
2014-12-11,1.911000
2015-06-29,0.210000
2020-10-06,0.311000
2004-03-29,0.233000
2011-12-15,0.094000
2018-12-28,0.158000
2023-10-05,0.396000
2002-12-30,0.571000
2009-12-17,0.296000
2024-04-05,0.671000
2024-12-18,7.191000
2006-09-27,0.463000
2009-03-26,0.606000
2008-03-27,0.452000
2020-04-07,0.659000
2020-12-11,5.322000
2025-07-08,0.494000
2003-12-23,0.507000
2018-10-04,0.855000
2021-12-16,3.635000
2008-09-26,0.396000
2011-07-11,0.116000
2006-06-28,0.429000
2025-10-06,0.436000
2000-03-29,0.560000
2019-12-30,0.493000
2007-12-18,0.448000
2021-07-07,0.249000
2021-12-30,0.494000
2005-12-20,0.372000
2018-04-06,0.337000
2016-04-07,0.226000
2021-10-05,0.233000
1999-09-29,0.560000
2013-12-30,0.857000
2017-04-07,0.265000
2017-10-05,0.284000
2005-09-28,0.339000
2010-09-23,0.218000
2015-12-30,1.250000
2021-04-06,0.464000
2003-03-26,0.253000
2005-03-30,0.340000
2012-07-06,0.360000
2014-06-27,0.248000
2014-09-29,0.213000
2025-12-18,9.109000
2004-06-29,0.320000
2011-09-22,0.403000
2016-12-15,2.281000
2016-12-29,0.224000
2019-12-13,4.170000
2024-07-09,0.496000
2002-12-19,0.085000
2014-12-30,2.246000
2015-12-11,8.925000
2017-07-07,0.267000
2019-07-09,0.393000
2024-10-07,0.267000
2006-03-29,0.380000
2008-06-26,0.488000
2007-03-28,0.341000
2017-12-28,0.012000
2020-12-30,0.933000
2003-09-25,0.241000
2020-07-07,0.326000
2010-03-25,0.240000
2011-03-24,0.363000
2022-12-29,0.252000
2023-07-06,0.388000
2012-10-04,0.244000
2010-06-24,0.281000
2014-03-28,0.136000
2022-07-07,0.292000
2013-03-27,0.097000
2013-09-27,0.192000
2016-10-06,0.214000
2019-10-08,0.406000
2023-12-15,0.967000
2025-12-30,0.450000
1999-12-31,1.510000
2006-12-19,0.525000
2026-07-07,0.490000
2012-12-28,0.299000
2015-09-29,0.244000
2016-07-07,0.238000
2018-12-14,4.451000
2022-12-16,3.307000
2023-04-05,0.608000
2007-09-26,0.446000
2022-10-06,0.148000
2011-06-23,0.277000
2015-03-30,0.186000
2017-12-14,0.729000
2022-04-06,0.457000
2005-06-28,0.325000
2010-12-16,0.127000
2024-12-30,0.445000
2013-06-27,0.217000
2023-12-28,0.257000
2003-06-27,0.168000
2004-12-21,0.434000
2009-06-26,0.411000
2019-04-09,0.408000
2026-04-07,0.687000
2004-09-28,0.298000
2018-07-09,0.404000