f/overrides/event-backup/ieus-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
2009-06-22,0.376000
2011-06-21,0.471000
2016-06-22,0.800000
2018-06-19,0.920000
2023-12-20,0.610000
2024-12-17,0.549000
2010-06-21,0.318000
2017-06-20,0.648000
2019-06-17,1.675000
2024-06-11,1.194000
2025-06-16,1.377000
2014-06-24,0.428000
2020-12-14,0.367000
2021-12-13,0.914000
2008-12-22,0.286000
2022-06-09,1.169000
2019-12-16,0.574000
2021-12-30,0.131000
2009-12-21,0.389000
2011-12-19,0.483000
2012-12-17,0.611000
2014-12-19,0.563000
2016-12-21,0.286000
2017-12-19,0.582000
2025-12-16,0.812000
2023-06-07,1.057000
2026-06-15,1.443000
2010-12-20,0.630000
2012-06-20,0.697000
2013-06-25,0.542000
2018-12-18,0.520000
2020-06-15,0.384000
2021-06-10,0.785000
2007-12-24,0.095000
2008-06-23,0.698000
2013-12-17,0.578000
2015-06-24,0.520000
2015-12-21,0.414000
2022-12-13,0.313000