f/overrides/event-backup/efav-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
2011-12-20,0.233000
2023-12-20,0.821000
2017-12-19,0.394000
2024-12-17,0.864000
2022-06-09,1.109000
2025-06-16,1.586000
2015-06-25,0.944000
2016-06-22,1.003000
2018-06-19,1.453000
2019-12-16,1.734000
2019-06-17,1.386000
2020-06-15,0.977000
2021-06-10,1.265000
2022-12-13,0.497000
2015-12-21,0.670000
2012-06-21,0.579000
2012-12-18,0.500000
2014-06-25,1.372000
2014-12-17,0.828000
2025-12-16,1.173000
2026-06-15,1.684000
2013-06-27,0.786000
2021-12-13,0.634000
2023-06-07,1.311000
2024-06-11,1.425000
2013-12-18,0.774000
2016-12-21,1.411000
2017-06-20,1.397000
2018-12-18,0.771000