f/overrides/event-backup/dfj-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
2011-12-21,0.363000
2018-06-25,0.640000
2019-06-24,0.795000
2020-12-21,0.944000
2024-09-25,0.025000
2025-03-26,0.020000
2025-12-26,1.375000
2006-12-21,0.052000
2013-06-24,0.675000
2015-12-21,0.350000
2021-12-27,0.753000
2022-06-24,0.995000
2026-06-25,1.330000
2023-12-22,0.530000
2009-12-21,0.289000
2011-06-22,0.534000
2015-06-22,0.346000
2019-09-24,0.060000
2022-09-26,0.001000
2023-03-27,0.785000
2023-06-26,0.461000
2025-06-25,1.095000
2009-03-23,0.038000
2010-06-28,0.313000
2012-06-25,0.611000
2016-06-20,0.465000
2017-06-26,0.640000
2019-12-23,0.791000
2024-06-25,0.243000
2010-12-22,0.388000
2014-12-19,0.356000
2016-09-26,0.005000
2017-12-26,0.647000
2014-06-23,0.436000
2017-09-26,0.002000
2020-06-23,0.935000
2022-12-23,0.661000
2023-12-28,0.046000
2024-12-26,0.964000
2025-09-25,0.090000
2009-06-22,0.392000
2021-09-24,0.025000
2024-03-22,0.615000
2021-06-24,0.698000
2007-12-17,0.612000
2008-12-22,0.456000
2010-09-20,0.051000
2012-12-24,0.362000
2013-12-24,0.447000
2016-12-23,0.619000
2018-12-24,0.580000