f/overrides/event-backup/jfbux-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
2020-03-31,0.054000
2020-09-30,0.057000
2025-12-31,0.306000
2026-03-31,0.092000
2017-12-29,0.260000
2018-12-14,0.874000
2019-03-29,0.047000
2020-06-30,0.054000
2021-09-30,0.052000
2023-12-15,0.243000
2025-06-30,0.098000
2023-09-29,0.083000
2019-12-16,0.969000
2020-12-31,0.173000
2021-06-30,0.049000
2021-12-15,0.345000
2022-06-30,0.064000
2022-09-30,0.068000
2022-12-30,0.161000
2024-09-30,0.097000
2025-09-30,0.099000
2024-12-16,0.306000
2017-12-15,1.123000
2018-03-29,0.043000
2018-09-28,0.052000
2021-12-31,0.433000
2022-12-15,0.935000
2024-03-28,0.077000
2024-06-28,0.089000
2025-03-31,0.085000
2018-12-31,0.316000
2023-12-29,0.187000
2019-06-28,0.058000
2019-09-30,0.058000
2021-03-31,0.045000
2022-03-31,0.045000
2023-06-30,0.074000
2024-12-31,0.346000
2017-09-29,0.048000
2018-06-29,0.048000
2019-12-31,0.163000
2020-12-15,1.048000
2023-03-31,0.070000
2025-12-15,0.474000
2026-06-30,0.098000