f/overrides/event-backup/mbsax-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
2020-07-24,0.006000
2020-08-25,0.010000
2022-08-25,0.072000
2023-05-24,0.049000
2025-04-24,0.045000
2025-12-12,0.371000
2026-05-22,0.064000
2020-02-25,0.013000
2020-11-23,0.003000
2020-12-14,0.003000
2022-03-25,0.020000
2023-06-26,0.054000
2023-12-14,0.057000
2026-01-26,0.057000
2022-02-22,0.019000
2023-02-22,0.042000
2023-11-22,0.060000
2024-05-24,0.059000
2024-11-21,0.034000
2026-04-24,0.060000
2020-01-24,0.020000
2021-01-25,0.003000
2026-07-27,0.059000
2019-11-25,0.030000
2020-03-25,0.013000
2020-05-26,0.006000
2023-08-25,0.048000
2024-08-26,0.049000
2020-10-26,0.005000
2022-06-24,0.023000
2022-07-25,0.029000
2022-10-25,0.015000
2023-04-24,0.048000
2020-09-24,0.014000
2021-02-22,0.004000
2024-09-24,0.063000
2021-04-26,0.004000
2023-03-27,0.048000
2024-01-25,0.057000
2025-10-27,0.064000
2023-09-25,0.056000
2024-04-24,0.054000
2025-02-24,0.039000
2020-04-24,0.014000
2021-07-26,0.003000
2024-06-24,0.055000
2025-03-25,0.047000
2025-09-24,0.065000
2025-11-21,0.056000
2026-03-25,0.065000
2020-06-24,0.005000
2021-03-25,0.005000
2021-11-22,0.019000
2022-01-25,0.020000
2022-04-25,0.016000
2023-10-25,0.050000
2025-08-25,0.060000
2019-12-17,0.012000
2024-07-25,0.060000
2025-07-25,0.049000
2021-08-25,0.002000
2022-05-24,0.020000
2024-03-22,0.058000
2025-01-27,0.044000
2026-02-23,0.060000
2021-10-25,0.014000
2022-12-14,0.048000
2023-01-25,0.047000
2023-07-25,0.052000
2021-05-24,0.005000
2021-09-24,0.002000
2021-12-15,0.110000
2022-09-26,0.025000
2024-02-23,0.055000
2024-10-25,0.056000
2025-05-23,0.052000
2025-06-24,0.048000
2021-06-24,0.003000
2022-11-23,0.040000
2024-12-13,0.040000
2026-06-24,0.064000