f/overrides/event-backup/efg-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
2013-06-27,0.872000
2016-06-22,1.005000
2022-12-13,0.180000
2023-12-20,0.656000
2025-06-16,1.074000
2005-12-23,0.232000
2015-06-25,0.914000
2018-12-18,0.409000
2021-12-13,0.681000
2026-06-15,0.981000
2009-12-22,0.389000
2011-12-20,0.488000
2018-06-19,0.959000
2019-06-17,0.969000
2020-12-14,0.352000
2006-12-21,0.689000
2009-06-23,0.766000
2013-12-18,0.457000
2021-06-10,0.893000
2007-12-20,0.729000
2014-12-17,0.460000
2017-06-20,0.885000
2017-12-19,0.373000
2020-06-15,0.507000
2024-06-11,0.890000
2025-12-16,1.806000
2011-06-22,0.802000
2016-12-21,0.394000
2023-06-07,0.919000
2008-06-25,0.904000
2010-06-23,0.668000
2012-06-21,0.896000
2012-12-18,0.480000
2024-12-17,0.695000
2008-12-23,0.417000
2014-06-25,1.083000
2015-12-21,0.264000
2019-12-16,0.493000
2021-12-30,0.125000
2022-06-09,0.882000
2010-12-21,0.420000