f/overrides/event-backup/bsct-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
2025-09-22,0.071000
2020-08-24,0.042000
2022-04-18,0.036000
2022-12-19,0.049000
2023-01-23,0.053000
2025-06-23,0.072000
2025-08-18,0.078000
2023-12-18,0.065000
2024-07-22,0.074000
2019-11-18,0.048000
2021-04-19,0.033000
2022-09-19,0.037000
2022-11-21,0.047000
2023-04-24,0.060000
2023-07-24,0.063000
2026-03-23,0.068000
2022-03-21,0.037000
2022-06-21,0.037000
2025-01-21,0.068000
2020-01-21,0.046000
2021-02-22,0.031000
2021-10-18,0.035000
2022-01-24,0.036000
2022-10-24,0.046000
2026-07-20,0.070000
2021-09-20,0.033000
2022-07-18,0.038000
2019-10-21,0.050000
2020-02-24,0.042000
2020-04-20,0.041000
2021-01-19,0.035000
2021-05-24,0.034000
2021-07-19,0.034000
2023-06-20,0.060000
2025-04-21,0.071000
2025-07-21,0.074000
2026-02-23,0.067000
2021-08-23,0.033000
2025-11-24,0.070000
2026-06-22,0.070000
2025-05-19,0.074000
2021-06-21,0.032000
2023-03-20,0.055000
2023-08-21,0.064000
2024-04-22,0.069000
2024-11-18,0.069000
2025-02-24,0.067000
2020-05-18,0.042000
2020-06-22,0.040000
2023-09-18,0.062000
2026-04-20,0.070000
2020-07-20,0.042000
2021-03-22,0.034000
2022-02-22,0.033000
2024-03-18,0.062000
2024-09-23,0.069000
2020-11-23,0.039000
2024-01-22,0.062000
2022-08-22,0.038000
2023-11-20,0.065000
2024-02-20,0.064000
2025-10-20,0.070000
2026-01-20,0.069000
2022-05-23,0.038000
2024-05-20,0.073000
2024-06-24,0.072000
2024-10-21,0.069000
2025-12-22,0.070000
2026-05-18,0.072000
2020-12-21,0.030000
2023-10-23,0.062000
2020-09-21,0.040000
2025-03-24,0.069000
2019-12-23,0.075000
2023-02-21,0.048000
2023-05-22,0.063000
2024-12-23,0.071000
2020-03-23,0.042000
2020-10-19,0.041000
2021-11-22,0.034000
2021-12-20,0.037000
2024-08-19,0.075000