f/overrides/event-backup/nwoix-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
2013-12-20,0.927000
2020-09-10,0.346000
2017-03-14,0.007000
2023-12-22,0.455000
2024-09-12,0.023000
2007-09-25,0.039000
2010-06-22,0.026000
2011-06-21,0.035000
2022-09-15,0.012000
2010-09-24,0.020000
2016-09-15,0.017000
2021-09-09,0.015000
2016-03-15,0.014000
2016-12-19,0.638000
2023-06-15,0.031000
2025-12-23,0.809000
2009-09-22,0.018000
2015-03-17,0.016000
2015-09-15,0.024000
2015-12-21,0.415000
2009-12-22,0.124000
2017-09-14,0.031000
2024-12-23,1.222000
2019-03-12,0.014000
2026-03-25,0.008000
2012-06-19,0.041000
2013-09-26,0.019000
2014-12-19,1.056000
2007-12-26,0.184000
2021-12-23,0.859000
2025-09-11,0.023000
2009-06-23,0.040000
2017-12-20,0.481000
2020-12-23,0.268000
2019-06-11,0.047000
2024-06-13,0.024000
2010-12-29,0.332000
2014-09-18,0.032000
2016-06-14,0.044000
2022-06-09,0.025000
2025-06-12,0.036000
2008-06-24,0.030000
2013-03-19,0.020000
2014-06-17,0.030000
2014-03-18,0.019000
2018-09-12,0.031000
2022-12-23,0.193000
2009-03-24,0.013000
2010-04-27,0.053000
2011-09-20,0.024000
2018-12-20,0.724000
2026-06-24,0.032000
2012-12-21,0.500000
2015-06-16,0.046000
2017-06-13,0.046000
2008-12-22,0.086000
2011-12-21,0.506000
2018-03-13,0.016000
2018-06-12,0.053000
2019-09-12,0.034000
2008-03-25,0.033000
2012-09-11,0.025000
2013-06-25,0.024000
2008-09-23,0.037000
2019-12-23,0.865000