f/overrides/event-backup/esifx-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
2020-09-09,0.036000
2021-03-09,0.035000
2022-03-09,0.034000
2016-12-13,0.067000
2017-06-09,0.044000
2019-12-17,0.239000
2020-06-09,0.040000
2020-08-18,0.105000
2022-09-09,0.042000
2024-03-11,0.046000
2026-03-10,0.045000
2017-07-26,0.037000
2021-09-09,0.029000
2022-12-09,0.447000
2024-12-10,0.576000
2025-06-10,0.049000
2017-03-09,0.042000
2018-03-09,0.038000
2019-06-11,0.040000
2024-06-11,0.044000
2020-12-10,0.100000
2023-03-09,0.045000
2024-09-10,0.051000
2025-03-11,0.047000
2026-06-09,0.050000
2019-03-11,0.038000
2020-03-10,0.044000
2022-06-09,0.038000
2025-12-09,0.532000
2017-09-11,0.042000
2018-12-11,0.408000
2019-08-08,0.045000
2023-06-09,0.043000
2023-09-11,0.046000
2023-12-11,0.105000
2018-08-09,0.035000
2018-09-11,0.045000
2019-09-10,0.040000
2021-06-09,0.033000
2021-12-09,0.882000
2016-09-09,0.035000
2017-12-12,0.290000
2018-06-11,0.042000
2025-09-09,0.047000