f/overrides/event-backup/icmbx-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
2013-06-26,0.048000
2011-09-27,0.051000
2014-06-26,0.030000
2017-06-28,0.036000
2020-06-30,0.020000
2005-12-29,0.043000
2012-09-25,0.052000
2025-03-31,0.167000
2005-09-29,0.046000
2010-12-29,0.366000
2012-06-19,0.054000
2013-12-27,0.667000
2015-06-26,0.042000
2015-09-28,0.061000
2023-12-29,0.008000
2008-12-29,0.064000
2009-06-26,0.054000
2016-09-27,0.043000
2020-03-31,0.094000
2021-06-30,0.027000
2023-09-29,0.109000
2008-06-26,0.045000
2018-03-29,0.083000
2019-12-31,0.355000
2024-06-28,0.092000
2025-06-30,0.080000
2026-06-30,0.066000
2007-12-27,0.048000
2010-06-28,0.037000
2011-03-30,0.029000
2016-03-29,0.098000
2016-06-28,0.036000
2021-09-30,0.041000
2022-03-31,0.042000
2022-09-30,0.089000
2006-12-28,0.185000
2024-09-30,0.071000
2015-03-27,0.029000
2018-09-26,0.049000
2021-03-31,0.109000
2022-06-30,0.058000
2007-09-27,0.054000
2009-09-29,0.049000
2013-09-25,0.035000
2017-03-29,0.002000
2023-03-31,0.226000
2006-03-30,0.046000
2010-04-01,0.041000
2011-12-28,0.765000
2014-09-26,0.032000
2016-12-29,0.392000
2021-12-31,0.076000
2023-06-30,0.128000
2005-06-29,0.020000
2009-12-29,0.198000
2012-12-27,0.457000
2014-03-27,0.024000
2017-09-27,0.050000
2018-12-28,0.190000
2006-06-29,0.051000
2008-09-25,0.044000
2017-12-27,0.271000
2018-06-27,0.031000
2008-03-27,0.042000
2013-03-27,0.029000
2014-12-29,1.186000
2020-09-30,0.035000
2026-03-31,0.119000
2010-03-26,0.039000
2010-09-29,0.031000
2012-03-28,0.043000
2019-06-28,0.046000
2019-09-30,0.033000
2024-03-28,0.212000
2006-09-28,0.048000
2007-06-28,0.055000
2011-06-30,0.052000
2020-12-31,0.035000
2025-09-30,0.055000
2007-03-28,0.174000
2019-03-29,0.125000
2009-03-27,0.068000