f/overrides/event-backup/ncgfx-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
2011-09-21,0.088000
2020-12-29,0.145000
2022-12-28,0.166000
2023-10-04,0.103000
2026-04-06,0.040000
2019-10-07,0.133000
2021-12-29,0.135000
2025-04-03,0.046000
2000-06-28,0.024000
2010-03-24,0.039000
2013-09-26,0.050000
2015-12-29,0.090000
2016-07-06,0.056000
2004-03-26,0.009000
2012-12-27,0.136000
2015-09-28,0.061000
2004-06-25,0.035000
2016-04-06,0.062000
1999-12-28,0.208000
2008-12-16,0.087000
2010-06-23,0.074000
2012-10-03,0.115000
2004-12-20,0.098000
2025-07-07,0.090000
2025-12-29,0.124000
2004-09-27,0.028000
2010-09-22,0.043000
2014-12-10,7.706000
2023-04-04,0.097000
2024-12-27,0.148000
2013-12-12,2.120000
2018-04-05,0.106000
2007-12-17,2.019000
2019-04-08,0.122000
2019-07-08,0.115000
2008-06-25,0.111000
2023-12-14,3.402000
2018-10-03,0.141000
2020-04-06,0.114000
2006-03-28,0.045000
2014-09-26,0.065000
2017-10-04,0.095000
1999-09-29,0.044000
2011-03-23,0.040000
2020-12-10,1.641000
2023-07-05,0.108000
2024-12-17,5.975000
2007-09-25,0.046000
2014-06-26,0.084000
2016-12-28,0.071000
2017-04-06,0.075000
2021-10-04,0.076000
2008-09-25,0.051000
2009-03-25,0.055000
2008-03-26,0.051000
2017-12-13,2.391000
2024-10-04,0.117000
2007-06-26,0.095000
2013-06-26,0.066000
2015-12-10,2.442000
2020-10-05,0.107000
2022-07-06,0.094000
2005-03-29,0.048000
2013-03-26,0.006000
2014-03-27,0.012000
2015-06-26,0.043000
2015-03-27,0.047000
2025-12-17,6.149000
2002-12-27,0.028000
2003-06-25,0.020000
2006-09-26,0.084000
2020-07-06,0.104000
2007-03-27,0.044000
2011-12-14,0.093000
2021-07-06,0.077000
2021-12-15,3.128000
2023-12-27,0.180000
2006-12-18,0.063000
2019-12-27,0.133000
2013-12-27,0.096000
2022-04-05,0.059000
2024-04-04,0.073000
2025-10-03,0.078000
2014-12-29,0.067000
2018-12-13,2.594000
2022-12-15,0.541000
2022-10-05,0.079000
2003-03-25,0.025000
2005-12-19,0.046000
2009-06-25,0.078000
2012-03-29,0.048000
2009-12-16,0.066000
2011-06-22,0.082000
2017-07-06,0.081000
2016-10-05,0.054000
2005-09-27,0.039000
2006-06-27,0.070000
2012-07-05,0.103000
2003-09-24,0.011000
2003-12-22,0.040000
2017-12-27,0.104000
2019-12-12,1.991000
2005-06-27,0.039000
2009-09-23,0.034000
2021-04-05,0.045000
2024-07-08,0.118000
2000-03-28,0.024000
2010-12-15,0.068000
2018-07-06,0.144000
2018-12-27,0.097000
2026-07-06,0.093000