f/overrides/event-backup/ech-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
2008-12-23,0.113000
2009-06-23,0.413000
2011-12-20,0.044000
2012-06-21,0.881000
2018-06-19,0.920000
2022-06-09,1.135000
2020-12-14,0.147000
2025-06-16,0.672000
2019-06-17,0.750000
2011-12-28,0.041000
2012-12-18,0.066000
2014-06-25,0.637000
2017-06-20,0.694000
2017-12-19,0.049000
2018-12-18,0.061000
2020-06-15,0.506000
2024-06-11,0.698000
2009-12-22,0.185000
2016-06-22,0.676000
2008-06-25,0.533000
2014-12-17,0.057000
2015-06-25,0.565000
2023-12-20,0.176000
2025-12-30,0.078000
2022-12-13,0.689000
2023-06-07,1.168000
2012-12-27,0.022000
2013-06-27,0.626000
2013-12-18,0.026000
2019-12-16,0.074000
2021-12-13,0.682000
2021-12-30,0.088000
2016-12-21,0.015000
2021-06-10,0.497000
2007-12-24,0.049000
2010-06-23,0.507000
2010-12-29,0.033000
2011-06-22,0.945000
2013-12-27,0.025000
2015-12-21,0.115000
2024-12-17,0.084000
2025-12-16,0.063000
2026-06-15,0.645000