f/overrides/event-backup/esg-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
2021-12-17,0.356000
2023-03-17,0.244000
2021-06-18,0.324000
2025-09-19,0.381000
2023-09-15,0.303000
2024-09-20,0.411000
2016-09-19,0.163000
2020-09-18,0.279000
2023-06-16,0.342000
2025-12-19,0.467000
2026-03-20,0.281000
2017-03-20,0.143000
2018-03-19,0.198000
2021-03-19,0.239000
2019-09-20,0.274000
2022-12-16,0.381000
2019-06-21,0.293000
2020-06-19,0.277000
2021-09-17,0.277000
2022-03-18,0.282000
2022-06-17,0.296000
2017-12-21,0.320000
2018-06-18,0.274000
2019-03-15,0.251000
2022-09-16,0.305000
2024-06-21,0.413000
2019-12-23,0.346000
2020-03-20,0.307000
2020-12-18,0.353000
2023-12-15,0.391000
2024-03-15,0.290000
2016-12-22,0.322000
2017-06-19,0.523000
2017-09-18,0.245000
2025-03-21,0.262000
2025-06-20,0.410000
2026-06-18,0.408000
2018-09-24,0.296000
2018-12-21,0.257000
2024-12-20,0.511000