f/overrides/event-backup/esgu-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
2020-06-15,0.255000
2025-06-16,0.323000
2017-03-24,0.321000
2018-09-26,0.240000
2020-03-25,0.260000
2023-12-20,0.337000
2017-09-26,0.185000
2019-03-20,0.220000
2021-03-25,0.272000
2023-03-23,0.470000
2023-06-07,0.298000
2024-12-17,0.408000
2021-06-10,0.248000
2022-06-09,0.276000
2022-09-26,0.395000
2026-03-17,0.370000
2024-09-25,0.439000
2018-12-17,0.295000
2019-06-17,0.294000
2019-12-16,0.306000
2020-09-23,0.283000
2021-09-24,0.319000
2022-03-24,0.322000
2023-09-26,0.399000
2025-03-18,0.328000
2025-12-16,0.455000
2024-03-21,0.384000
2017-12-19,0.310000
2018-03-22,0.181000
2018-06-26,0.235000
2019-09-24,0.110000
2020-12-14,0.292000
2026-06-15,0.343000
2017-06-27,0.245000
2018-12-28,0.045000
2019-12-30,0.011000
2021-12-13,0.309000
2022-12-13,0.350000
2024-06-11,0.292000
2025-09-16,0.365000