f/overrides/event-backup/ivosx-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
2023-03-22,0.059000
2018-09-13,0.065000
2020-03-12,0.066000
2020-06-11,0.064000
2024-06-21,0.086000
2024-09-20,0.085000
2021-12-16,0.552000
2022-09-15,0.096000
2022-12-02,0.523000
2023-06-22,0.088000
2023-09-22,0.099000
2014-12-11,0.045000
2016-09-15,0.044000
2019-06-13,0.066000
2026-06-22,0.148000
2023-12-04,0.767000
2025-09-22,0.080000
2026-03-20,0.065000
2024-12-03,1.885000
2025-06-20,0.092000
2015-12-10,0.095000
2019-09-12,0.067000
2022-06-07,0.061000
2018-06-14,0.057000
2019-03-14,0.038000
2021-06-10,0.054000
2025-03-21,0.091000
2015-06-11,0.048000
2016-06-16,0.016000
2017-06-15,0.017000
2018-12-13,0.398000
2019-12-12,0.156000
2021-03-11,0.042000
2022-03-10,0.051000
2017-09-14,0.057000
2017-12-14,0.123000
2018-03-15,0.039000
2024-03-22,0.081000
2015-03-12,0.023000
2017-03-16,0.014000
2020-12-10,0.086000
2021-09-16,0.059000
2025-12-02,2.360000
2015-09-10,0.048000
2016-12-08,0.077000
2020-09-10,0.076000