f/overrides/event-backup/mco-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
2025-02-25,0.940000
2003-08-18,0.022500
2007-08-16,0.080000
2011-11-16,0.140000
2013-11-18,0.250000
2019-11-20,0.500000
2021-05-19,0.620000
2024-08-16,0.850000
2025-05-16,0.940000
2026-03-02,1.030000
2005-02-16,0.019000
2006-05-17,0.070000
2009-02-18,0.100000
2010-08-18,0.105000
2011-02-16,0.115000
2017-11-20,0.380000
2012-08-16,0.160000
2001-08-16,0.022500
2002-05-16,0.022500
2003-05-16,0.022500
2004-08-18,0.037500
2005-05-25,0.028000
2005-08-17,0.055000
2008-08-18,0.100000
2014-02-18,0.280000
2020-11-20,0.560000
2021-11-22,0.620000
2024-11-22,0.850000
2007-02-15,0.080000
2010-11-17,0.105000
2014-11-18,0.280000
2016-11-17,0.370000
2018-11-20,0.440000
2020-02-24,0.560000
2026-05-15,1.030000
2001-02-22,0.022500
2003-11-18,0.022500
2004-05-18,0.037500
2013-05-16,0.200000
2017-02-15,0.380000
2018-02-16,0.440000
2022-11-22,0.700000
2003-02-18,0.022500
2006-08-16,0.070000
2009-08-18,0.100000
2012-11-16,0.160000
2015-05-18,0.340000
2019-08-19,0.500000
2004-11-17,0.037500
2005-11-16,0.055000
2006-11-16,0.070000
2007-11-16,0.080000
2008-11-18,0.100000
2011-08-17,0.140000
2015-08-18,0.340000
2025-11-21,0.940000
2008-05-16,0.100000
2010-05-18,0.105000
2017-05-18,0.380000
2017-08-18,0.380000
2004-02-18,0.037500
2006-02-15,0.070000
2009-11-18,0.100000
2009-05-18,0.100000
2016-02-17,0.370000
2020-08-19,0.560000
2024-05-16,0.850000
2002-11-18,0.022500
2010-02-17,0.105000
2014-05-16,0.280000
2023-02-23,0.770000
2025-08-15,0.940000
2000-11-16,0.022500
2008-02-15,0.100000
2012-05-17,0.160000
2015-11-18,0.340000
2016-05-18,0.370000
2020-05-19,0.560000
2001-11-16,0.022500
2002-02-26,0.022500
2002-08-16,0.022500
2007-05-16,0.080000
2011-05-18,0.140000
2018-05-18,0.440000
2019-05-17,0.500000
2013-08-16,0.250000
2014-08-18,0.280000
2019-02-22,0.500000
2024-02-22,0.850000
2026-08-14,1.030000
2001-05-16,0.022500
2012-02-15,0.160000
2021-08-19,0.620000
2022-08-18,0.700000
2023-08-17,0.770000
2023-05-18,0.770000
2013-02-15,0.200000
2015-02-18,0.340000
2016-08-18,0.370000
2018-08-17,0.440000
2021-02-24,0.620000
2022-02-24,0.700000
2022-05-19,0.700000
2023-11-22,0.770000