f/overrides/event-backup/ibti-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
2024-09-03,0.073000
2024-12-02,0.071000
2026-02-02,0.069000
2023-10-02,0.063000
2024-04-01,0.073000
2025-07-01,0.072000
2025-08-01,0.075000
2020-09-01,0.015000
2021-05-03,0.010000
2021-06-01,0.018000
2021-12-16,0.030000
2022-03-01,0.020000
2022-12-01,0.042000
2025-12-01,0.068000
2021-04-01,0.015000
2023-02-01,0.054000
2024-05-01,0.072000
2023-12-01,0.063000
2023-09-01,0.062000
2024-11-01,0.073000
2024-12-18,0.068000
2025-10-01,0.071000
2024-10-01,0.071000
2025-03-03,0.067000
2025-05-01,0.073000
2026-05-01,0.068000
2020-07-01,0.015000
2021-09-01,0.019000
2022-08-01,0.030000
2023-03-01,0.051000
2024-08-01,0.070000
2025-09-02,0.074000
2025-12-19,0.071000
2026-07-01,0.068000
2020-08-03,0.016000
2021-08-02,0.021000
2022-10-03,0.035000
2023-08-01,0.062000
2020-11-02,0.015000
2022-11-01,0.043000
2023-06-01,0.053000
2024-06-03,0.075000
2021-07-01,0.019000
2022-12-15,0.048000
2023-04-03,0.058000
2026-08-03,0.069000
2020-12-17,0.015000
2021-10-01,0.022000
2022-06-01,0.025000
2025-02-03,0.075000
2025-11-03,0.071000
2020-04-01,0.014000
2021-03-01,0.013000
2023-07-03,0.062000
2024-02-01,0.074000
2022-07-01,0.027000
2022-09-01,0.035000
2023-12-14,0.072000
2024-03-01,0.068000
2020-10-01,0.015000
2021-02-01,0.016000
2021-11-01,0.022000
2022-02-01,0.022000
2024-07-01,0.072000
2026-04-01,0.069000
2026-06-01,0.070000
2020-06-01,0.014000
2022-05-02,0.024000
2023-05-01,0.058000
2025-06-02,0.074000
2020-05-01,0.013000
2020-12-01,0.015000
2021-12-01,0.021000
2023-11-01,0.067000
2022-04-01,0.024000
2025-04-01,0.075000
2026-03-02,0.064000