f/overrides/event-backup/nrfax-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
2024-12-20,0.123000
2001-03-19,0.050000
2006-06-12,0.484000
2013-06-20,0.053000
2015-12-21,1.105000
2005-03-14,0.091000
2009-12-15,0.052000
2016-12-20,0.842000
2017-09-28,0.067000
2018-09-25,0.052000
2002-12-16,0.232000
2003-09-15,0.098000
2014-12-18,0.635000
2017-06-28,0.044000
2012-03-22,0.025000
2010-12-14,0.090000
2015-04-08,0.235000
2015-06-25,0.013000
2019-03-26,0.235000
2004-06-14,0.067000
2010-06-24,0.025000
2019-09-25,0.024000
2021-09-24,0.032000
2022-06-24,0.056000
2005-09-19,0.112000
2011-06-23,0.030000
2012-12-18,1.671000
2014-03-20,0.028000
2021-12-21,0.527000
2001-12-17,0.238000
2009-09-25,0.033000
2022-03-24,0.142000
2002-03-18,0.071000
2008-04-14,0.401000
2013-03-21,0.057000
2019-12-18,1.915000
2002-09-16,0.094000
2007-12-21,2.048000
2010-09-23,0.025000
2023-03-24,0.136000
2006-03-13,0.068000
2017-12-20,1.054000
2025-03-25,0.072000
2001-09-10,0.107000
2013-12-18,3.786000
2016-03-30,0.113000
2009-03-27,0.083000
2011-09-22,0.030000
2018-03-26,0.344000
2003-06-16,0.115000
2004-09-13,0.083000
2008-03-27,0.088000
2024-06-26,0.043000
2004-03-15,0.081000
2012-09-20,0.031000
2014-09-23,0.030000
2014-06-19,0.035000
2022-12-21,0.038000
2003-12-15,0.396000
2001-06-18,0.090000
2015-03-30,0.048000
2020-09-24,0.042000
2015-09-29,0.070000
2019-06-25,0.041000
2026-06-25,0.074000
2018-06-26,0.061000
2024-09-26,0.069000
2020-03-25,0.217000
2022-09-26,0.038000
2007-03-12,0.077000
2012-06-21,0.038000
2017-03-29,0.286000
2005-06-13,0.481000
2008-06-26,0.098000
2011-12-13,0.037000
2003-03-17,0.107000
2007-06-11,0.403000
2013-04-09,0.307000
2021-06-24,0.035000
2002-06-27,0.015000
2010-03-25,0.073000
2020-12-18,0.123000
2005-12-22,1.028000
2006-12-22,0.816000
2006-09-18,0.040000
2011-03-24,0.036000
2016-09-30,0.059000
2026-03-25,0.102000
2009-06-26,0.044000
2023-12-19,0.020000
2025-06-26,0.054000
2025-09-26,0.057000
2020-06-24,0.025000
2018-12-19,0.730000
2007-09-17,0.082000
2023-09-26,0.072000
2021-03-24,0.201000
2016-06-30,0.043000
2014-04-08,0.731000
2024-03-25,0.218000
2004-12-20,0.670000
2008-09-26,0.129000
2013-09-24,0.045000
2025-12-22,0.182000
2016-04-07,0.551000
2023-06-26,0.037000