f/overrides/event-backup/ivoax-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
2016-12-08,0.067000
2019-09-12,0.050000
2021-03-11,0.025000
2022-09-15,0.083000
2025-06-20,0.076000
2016-09-15,0.035000
2019-12-12,0.140000
2022-06-07,0.049000
2022-12-02,0.485000
2015-03-12,0.015000
2020-06-11,0.050000
2021-09-16,0.040000
2017-12-14,0.109000
2017-03-16,0.001000
2018-06-14,0.045000
2018-12-13,0.382000
2019-03-14,0.025000
2023-03-22,0.048000
2024-09-20,0.068000
2016-06-16,0.010000
2019-06-13,0.050000
2020-09-10,0.060000
2021-06-10,0.035000
2023-09-22,0.083000
2023-12-04,0.750000
2024-12-03,1.866000
2018-03-15,0.025000
2018-09-13,0.050000
2020-12-10,0.071000
2021-12-16,0.534000
2022-03-10,0.032000
2024-03-22,0.062000
2024-06-21,0.069000
2025-12-02,2.343000
2017-06-15,0.010000
2015-06-11,0.040000
2015-12-10,0.087000
2017-09-14,0.035000
2020-03-12,0.050000
2023-06-22,0.078000
2025-09-22,0.065000
2026-06-22,0.134000
2014-12-11,0.039000
2025-03-21,0.076000
2026-03-20,0.051000
2015-09-10,0.040000