f/overrides/event-backup/ncbix-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
2004-09-28,0.111000
2011-07-11,0.044000
2019-12-13,0.490000
2026-07-07,0.131000
2015-09-29,0.063000
2018-10-04,0.125000
2021-12-30,0.118000
2009-03-26,0.135000
2017-07-07,0.071000
2011-03-24,0.079000
2017-04-07,0.070000
2009-06-26,0.135000
2020-07-07,0.083000
2016-04-07,0.062000
2023-10-05,0.105000
1999-09-29,0.191000
2002-12-30,0.215000
2019-04-09,0.102000
2025-07-08,0.134000
2005-09-28,0.120000
2007-03-28,0.123000
2009-12-17,0.097000
2022-10-06,0.080000
2023-04-05,0.096000
2003-09-25,0.101000
2013-12-13,0.082000
2014-12-11,0.563000
2017-12-14,0.159000
2020-12-11,0.728000
2016-07-07,0.067000
2006-03-29,0.132000
2010-03-25,0.084000
2010-12-16,0.118000
2012-07-06,0.098000
2013-12-30,0.140000
2005-12-20,0.131000
2019-10-08,0.099000
2022-12-16,0.293000
2025-12-18,0.893000
1999-12-30,0.321000
2003-12-23,0.175000
2007-12-18,0.151000
2012-10-04,0.063000
2017-12-28,0.066000
2007-06-27,0.154000
2018-12-14,0.751000
2025-12-30,0.151000
2023-07-06,0.103000
2003-06-27,0.091000
2008-12-17,0.163000
2010-06-24,0.086000
2015-12-11,1.090000
2020-10-06,0.075000
2021-10-05,0.060000
2004-03-29,0.093000
2005-03-30,0.118000
2006-06-28,0.140000
2008-03-27,0.155000
2021-07-07,0.065000
2002-12-19,0.055000
2005-06-28,0.116000
2012-12-28,0.065000
2016-12-29,0.058000
2000-03-29,0.194000
2011-12-15,0.095000
2004-06-29,0.142000
2018-07-09,0.095000
2024-07-09,0.126000
2025-10-06,0.117000
2010-09-23,0.075000
2013-03-27,0.036000
2014-03-28,0.045000
2016-12-15,0.269000
2018-04-06,0.084000
2004-12-21,0.136000
2020-12-30,0.273000
2019-12-30,0.106000
2008-06-26,0.145000
2011-06-23,0.036000
2014-12-30,0.305000
2015-03-30,0.048000
2015-06-29,0.058000
2024-04-05,0.111000
2024-12-18,0.681000
2014-06-27,0.062000
2007-09-26,0.150000
2015-12-30,0.187000
2023-12-28,0.121000
2025-04-04,0.129000
2026-04-07,0.121000
2011-09-22,0.128000
2012-03-30,0.085000
2021-04-06,0.062000
2021-12-16,0.745000
2020-04-07,0.097000
2022-07-07,0.071000
2006-12-19,0.169000
2008-09-26,0.130000
2013-09-27,0.054000
2014-09-29,0.056000
2017-10-05,0.071000
2006-09-27,0.149000
2009-09-24,0.106000
2018-12-28,0.096000
2019-07-09,0.099000
2024-12-30,0.214000
2003-03-26,0.102000
2013-06-27,0.059000
2016-10-06,0.059000
2022-04-06,0.056000
2022-12-29,0.106000
2024-10-07,0.028000