f/overrides/event-backup/dura-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
2019-10-01,0.203000
2021-07-01,0.187000
2023-07-03,0.257000
2024-07-01,0.221000
2025-04-01,0.268000
2019-04-01,0.126000
2020-04-01,0.200000
2021-12-29,0.262000
2026-04-01,0.299000
2026-07-01,0.270000
2021-10-01,0.246000
2022-04-01,0.257000
2020-07-01,0.308000
2022-07-01,0.197000
2024-04-01,0.226000
2024-10-01,0.251000
2019-12-30,0.387000
2023-04-03,0.251000
2025-12-29,0.416000
2020-12-29,0.252000
2021-04-01,0.234000
2022-10-03,0.253000
2022-12-28,0.254000
2023-12-27,0.308000
2025-10-01,0.225000
2018-12-27,0.160000
2019-07-01,0.200000
2020-10-01,0.240000
2023-10-02,0.294000
2024-12-27,0.387000
2025-07-01,0.306000