f/overrides/event-backup/imcv-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
2006-12-21,0.190000
2009-06-23,0.090333
2017-12-19,0.270667
2023-09-26,0.440000
2022-12-13,0.444000
2025-03-18,0.435000
2005-03-28,0.123000
2012-12-19,0.206667
2016-12-21,0.282667
2019-09-24,0.340667
2022-06-09,0.275000
2020-12-14,0.272667
2021-03-25,0.309667
2024-12-17,0.516000
2004-09-27,0.075667
2007-12-27,0.222667
2008-06-24,0.112667
2010-09-24,0.302333
2020-06-15,0.269000
2018-03-22,0.272667
2021-09-24,0.363000
2023-03-23,0.372000
2005-12-23,0.258667
2008-03-25,0.091667
2010-06-23,0.112000
2013-12-23,0.229667
2014-09-24,0.205333
2022-03-24,0.330000
2026-06-15,0.418000
2008-09-25,0.199333
2012-09-25,0.163333
2014-03-25,0.187333
2015-09-25,0.202667
2016-03-23,0.294000
2005-09-26,0.112333
2010-12-23,0.158667
2015-12-24,0.284333
2024-03-21,0.327000
2009-03-25,0.118000
2011-03-25,0.121000
2011-12-22,0.180000
2012-06-19,0.124000
2024-09-25,0.545000
2019-06-17,0.328333
2020-09-23,0.328333
2022-09-26,0.415000
2004-12-27,0.148000
2013-09-24,0.179000
2016-06-21,0.211000
2017-06-27,0.238333
2018-09-26,0.314000
2025-12-16,0.540000
2026-03-17,0.350000
2006-06-23,0.105000
2007-09-26,0.126667
2010-03-25,0.094000
2012-03-26,0.124000
2018-06-26,0.267333
2016-09-26,0.219667
2020-03-25,0.491333
2025-09-16,0.421000
2005-06-21,0.139000
2009-12-24,0.166667
2011-09-26,0.133667
2013-06-26,0.146333
2015-03-25,0.212333
2008-12-24,0.216667
2009-09-23,0.097667
2024-06-11,0.367000
2007-03-26,0.118333
2013-03-25,0.158000
2015-06-24,0.207667
2018-12-17,0.352000
2021-12-13,0.362000
2006-09-27,0.123000
2007-06-29,0.200667
2017-09-26,0.263667
2019-03-20,0.295667
2019-12-16,0.411333
2011-06-23,0.108000
2014-06-24,0.154667
2021-06-10,0.237000
2006-03-27,0.089333
2014-12-24,0.263667
2023-12-20,0.469000
2017-03-24,0.221333
2023-06-07,0.278000
2025-06-16,0.438000