f/overrides/event-backup/cmnix-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
2006-09-21,0.111000
2026-06-15,0.046000
2003-09-25,0.156000
2005-04-06,0.369000
2004-03-25,0.067000
2008-09-18,0.097000
2009-03-19,0.083000
2016-03-17,0.039000
2001-09-26,0.106000
2001-11-07,0.019000
2001-12-27,0.099000
2003-12-30,0.348000
2004-06-24,0.332000
2014-09-18,0.034000
2017-09-14,0.038000
2024-03-15,0.026000
2024-12-23,0.170000
2019-06-13,0.042000
2023-09-15,0.074000
2012-06-21,0.044000
2014-06-19,0.021000
2002-06-26,0.087000
2007-12-27,0.249000
2015-06-18,0.028000
2019-03-14,0.037000
2022-09-15,0.025000
2025-03-17,0.025000
2025-06-16,0.049000
2025-09-16,0.048000
2026-03-16,0.019000
2005-06-23,0.121000
2008-06-19,0.098000
2010-06-17,0.033000
2021-06-16,0.037000
2000-12-27,0.211000
2016-09-15,0.045000
2002-12-27,0.123000
2010-09-16,0.056000
2023-12-21,0.701000
2015-09-17,0.036000
2003-06-26,0.230000
2013-06-20,0.065000
2022-06-15,0.012000
2023-06-15,0.042000
2000-06-28,0.109000
2001-06-27,0.101000
2007-09-20,0.101000
2018-03-15,0.026000
2000-09-27,0.129000
2001-03-28,0.138000
2004-11-17,0.480000
2005-09-22,0.135000
2005-12-29,0.396000
2012-12-20,0.058000
2018-09-13,0.066000
2022-12-21,0.100000
2003-01-16,0.177000
2010-12-16,0.073000
2016-12-15,0.253000
2019-12-18,0.068000
2024-06-14,0.051000
2021-12-20,0.016000
2007-03-22,0.067000
2008-03-20,0.098000
2009-12-17,0.047000
2016-06-16,0.045000
2020-06-18,0.038000
2025-12-15,0.160000
2010-03-18,0.020000
2013-09-19,0.040000
2020-03-19,0.049000
2006-06-22,0.089000
2018-06-14,0.038000
2006-04-06,0.145000
2009-09-17,0.052000
2011-06-16,0.055000
2012-09-20,0.048000
2013-03-21,0.051000
2013-12-19,0.301000
2002-09-25,0.107000
2002-11-06,0.002000
2004-09-23,0.133000
2008-12-18,0.648000
2009-06-18,0.056000
2011-09-22,0.055000
2004-12-30,0.383000
2000-11-08,0.290000
2007-06-21,0.092000
2011-12-22,0.060000
2017-12-14,0.291000
2002-03-27,0.092000
2017-03-16,0.044000
2024-09-16,0.051000
2003-03-27,0.079000
2011-03-17,0.047000
2012-03-22,0.033000
2015-03-19,0.047000
2015-12-17,0.255000
2018-12-31,0.011000
2019-09-12,0.057000
2022-03-15,0.003000
2023-03-15,0.020000
2018-12-20,0.496000
2019-12-31,0.004000
2006-12-28,0.207000
2014-03-20,0.058000
2014-12-18,0.180000
2017-06-15,0.033000
2020-12-22,0.038000
2021-09-15,0.014000