f/overrides/event-backup/himcx-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
1997-12-31,0.100000
2004-06-29,0.003000
2022-08-26,5.075000
2023-12-22,0.128000
2009-12-17,0.095000
2013-12-20,0.317000
1999-02-26,3.260000
1999-12-28,7.820000
2005-06-22,0.025000
2007-06-19,0.007000
2021-12-22,0.679000
2024-08-23,0.678000
2011-12-28,0.131000
2014-08-27,4.550000
2015-08-19,4.473000
2019-08-27,6.147000
2017-08-24,1.258000
2019-12-23,0.055000
2020-08-27,3.034000
2006-06-22,0.006000
2007-12-17,0.138000
2008-06-23,0.013000
2016-12-21,0.049000
2018-08-23,3.781000
2020-12-21,0.624000
2021-08-27,6.707000
2000-12-28,0.530000
2011-08-26,0.054000
2013-08-13,1.066000
2015-12-22,0.013000
2000-06-28,9.810000
2003-12-29,0.036000
2008-12-16,0.108000
2009-08-27,0.007000
2012-12-27,0.230000
2016-08-25,3.628000
2014-12-22,0.299000
2017-12-20,0.593000
2018-12-21,0.207000
2023-08-25,1.854000
2003-06-26,0.017000
2004-12-15,0.067000
2005-12-19,0.097000
2006-12-13,0.323000
2025-08-25,5.058000
2025-12-19,0.240000