f/overrides/event-backup/efas-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
2023-05-03,0.065000
2021-04-05,0.059000
2021-09-03,0.068000
2024-05-03,0.068000
2025-03-05,0.069000
2026-04-06,0.086000
2026-07-06,0.090000
2017-04-03,0.057000
2018-09-06,0.080000
2019-07-03,0.078000
2019-11-05,0.075000
2020-12-03,0.053000
2021-02-03,0.055000
2019-04-03,0.082000
2023-02-03,0.082000
2023-10-04,0.068000
2017-06-01,0.057000
2017-12-28,0.415000
2018-02-05,0.072000
2022-10-05,0.082000
2023-03-03,0.073000
2023-08-03,0.068000
2023-11-03,0.068000
2026-08-05,0.090000
2017-09-01,0.072000
2018-04-04,0.072000
2019-02-05,0.082000
2021-10-05,0.068000
2024-03-05,0.068000
2025-08-05,0.072000
2017-12-01,0.072000
2018-06-05,0.077000
2018-12-28,0.154000
2017-02-01,0.057000
2019-12-04,0.075000
2025-12-03,0.072000
2021-12-03,0.068000
2025-12-30,0.153000
2018-12-06,0.082000
2021-03-03,0.059000
2026-02-04,0.082000
2022-09-06,0.082000
2026-03-04,0.086000
2017-07-03,0.062000
2018-08-03,0.077000
2019-08-05,0.075000
2025-10-03,0.072000
2019-05-03,0.082000
2025-05-05,0.071000
2022-04-05,0.068000
2022-07-06,0.082000
2024-11-05,0.076000
2021-11-03,0.068000
2020-08-05,0.048000
2020-10-05,0.051000
2022-02-03,0.068000
2022-05-04,0.072000
2024-12-04,0.076000
2018-10-03,0.082000
2020-02-05,0.072000
2020-07-06,0.048000
2019-10-03,0.075000
2021-05-05,0.059000
2025-02-05,0.074000
2025-04-03,0.069000
2025-09-04,0.072000
2020-09-03,0.048000
2021-08-04,0.065000
2022-11-03,0.082000
2018-03-05,0.072000
2018-05-03,0.072000
2018-07-05,0.077000
2024-06-05,0.068000
2017-05-01,0.057000
2019-06-05,0.080000
2023-12-05,0.068000
2022-06-03,0.078000
2022-12-29,0.136000
2023-04-05,0.073000
2024-04-03,0.068000
2025-06-04,0.071000
2025-07-03,0.072000
2026-06-03,0.090000
2017-10-02,0.072000
2020-12-30,0.053000
2021-12-30,0.126000
2024-10-03,0.075000
2019-03-05,0.082000
2020-11-04,0.053000
2021-07-06,0.061000
2024-02-05,0.068000
2026-05-05,0.086000
2020-04-03,0.048000
2022-12-05,0.082000
2024-07-03,0.068000
2018-11-05,0.082000
2019-09-05,0.075000
2020-03-04,0.072000
2024-09-05,0.075000
2017-03-01,0.057000
2017-11-01,0.072000
2023-07-06,0.065000
2017-08-01,0.067000
2022-03-03,0.068000
2023-09-06,0.068000
2023-12-28,0.156000
2024-08-05,0.074000
2024-12-30,0.162000
2020-05-05,0.048000
2020-06-03,0.048000
2023-06-05,0.065000
2025-11-05,0.072000
2019-12-30,0.075000
2021-06-03,0.061000
2022-08-03,0.082000