f/overrides/event-backup/fm-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
2021-12-30,0.002010
2022-06-09,0.607088
2023-06-07,0.427574
2024-06-11,0.621598
2016-06-22,0.508736
2017-12-19,0.374712
2020-06-15,0.638353
2018-06-19,0.805281
2021-06-10,0.490363
2021-12-13,0.212318
2022-12-13,0.079552
2013-06-27,0.025394
2017-06-20,0.274539
2017-12-28,0.026146
2016-12-21,0.026201
2018-12-18,0.317198
2019-06-17,0.792812
2020-12-14,0.187446
2023-12-20,0.524932
2013-12-18,0.066298
2014-06-25,0.826452
2014-12-17,2.823146
2024-12-17,0.451057
2015-06-25,0.603929
2015-12-21,0.083552
2019-12-16,0.155604