f/overrides/event-backup/ffiu-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
2017-10-30,0.060000
2018-01-30,0.044000
2022-04-28,0.053000
2025-12-30,0.220000
2019-10-30,0.063000
2020-01-30,0.053000
2021-04-29,0.053000
2022-01-28,0.050000
2023-06-29,0.068000
2021-10-28,0.055000
2023-09-28,0.066000
2026-03-30,0.225000
2019-01-30,0.063000
2020-04-29,0.055000
2022-05-27,0.055000
2023-03-30,0.064000
2023-12-28,0.230000
2018-07-30,0.050000
2018-11-29,0.060000
2019-11-27,0.061000
2020-12-29,0.134000
2021-11-29,0.052000
2022-08-30,0.058000
2023-02-27,0.063000
2024-06-28,0.210000
2018-08-30,0.050000
2018-09-27,0.050000
2021-01-28,0.054000
2022-02-25,0.050000
2023-10-30,0.013000
2018-10-30,0.060000
2019-05-30,0.063000
2020-10-29,0.055000
2021-06-29,0.054000
2023-05-30,0.066000
2018-12-28,0.070000
2020-06-29,0.050000
2023-01-30,0.060000
2025-06-27,0.210000
2019-03-28,0.060000
2019-08-29,0.063000
2020-07-30,0.056000
2021-09-29,0.055000
2021-12-30,0.252000
2023-07-28,0.069000
2024-03-28,0.225000
2025-09-29,0.220000
2026-06-29,0.223000
2018-06-28,0.055000
2019-02-27,0.055000
2020-05-28,0.055000
2020-11-27,0.053000
2021-07-29,0.054000
2022-06-29,0.058000
2022-12-29,0.070000
2022-11-29,0.064000
2018-02-27,0.040000
2019-09-27,0.063000
2020-03-30,0.060000
2020-09-29,0.054000
2021-02-25,0.053000
2022-03-30,0.052000
2022-07-28,0.058000
2018-03-28,0.050000
2018-04-27,0.050000
2019-07-30,0.065000
2021-05-27,0.054000
2022-09-29,0.063000
2022-10-28,0.063000
2025-03-28,0.215000
2017-12-28,0.052000
2018-05-30,0.050000
2019-12-30,0.066000
2023-04-27,0.065000
2023-08-30,0.074000
2024-09-27,0.210000
2017-11-29,0.052000
2019-04-29,0.063000
2020-08-28,0.053000
2021-03-30,0.053000
2024-12-30,0.220000
2020-02-27,0.055000
2019-06-27,0.060000
2021-08-30,0.055000