f/overrides/event-backup/grnb-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
2024-04-01,0.076000
2023-05-01,0.055000
2018-08-01,0.026000
2020-10-01,0.046000
2023-07-03,0.066000
2017-08-01,0.024000
2025-05-01,0.084000
2025-08-01,0.091000
2025-10-01,0.084000
2024-10-01,0.075000
2017-12-01,0.105000
2020-03-02,0.051000
2020-12-01,0.042000
2021-09-01,0.047000
2022-05-02,0.044000
2025-11-28,0.082000
2019-07-01,0.028000
2024-06-03,0.077000
2026-08-03,0.094000
2018-09-04,0.026000
2022-11-01,0.051000
2025-03-03,0.074000
2018-02-01,0.027000
2020-07-01,0.057000
2021-12-29,0.047000
2023-12-01,0.067000
2025-09-02,0.085000
2019-11-01,0.060000
2019-12-30,0.061000
2020-04-24,0.057000
2020-12-29,0.046000
2023-09-01,0.063000
2025-06-02,0.087000
2026-05-01,0.085000
2017-09-01,0.017000
2026-02-02,0.089000
2022-10-03,0.045000
2021-03-01,0.036000
2021-11-01,0.048000
2022-04-01,0.053000
2022-06-01,0.054000
2018-10-01,0.021000
2023-10-02,0.061000
2025-04-01,0.089000
2019-12-02,0.059000
2020-09-01,0.050000
2024-08-01,0.078000
2019-02-01,0.044000
2022-12-01,0.056000
2022-12-28,0.057000
2026-04-01,0.098000
2018-11-01,0.031000
2023-11-01,0.070000
2021-08-02,0.049000
2023-06-01,0.062000
2025-11-03,0.088000
2021-02-01,0.038000
2019-03-01,0.026000
2019-08-01,0.027000
2019-09-03,0.027000
2021-05-03,0.043000
2017-04-03,0.017000
2021-04-01,0.042000
2022-02-01,0.041000
2024-09-03,0.077000
2024-11-01,0.083000
2024-12-02,0.076000
2019-10-01,0.058000
2018-06-01,0.025000
2024-12-27,0.082000
2017-06-01,0.024000
2026-07-01,0.111000
2021-06-01,0.046000
2020-04-01,0.059000
2022-03-01,0.043000
2023-04-03,0.066000
2025-12-29,0.090000
2017-10-02,0.021000
2020-06-01,0.059000
2020-11-02,0.052000
2021-10-01,0.048000
2018-04-02,0.025000
2023-12-27,0.073000
2024-02-01,0.074000
2024-03-01,0.066000
2024-07-01,0.073000
2019-04-01,0.029000
2018-07-02,0.024000
2018-12-03,0.029000
2020-08-03,0.052000
2023-03-01,0.052000
2017-11-01,0.025000
2017-12-27,0.023000
2020-02-03,0.056000
2022-09-01,0.050000
2023-02-01,0.058000
2025-07-01,0.080000
2017-07-03,0.016000
2018-12-27,0.032000
2021-07-01,0.042000
2023-08-01,0.065000
2017-05-01,0.024000
2021-12-01,0.044000
2025-02-03,0.083000
2026-03-02,0.078000
2026-06-01,0.067000
2019-06-03,0.029000
2018-05-01,0.022000
2019-05-01,0.028000
2022-07-01,0.051000
2024-05-01,0.071000
2018-03-01,0.023000
2022-08-01,0.054000