f/overrides/event-backup/emmf-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
2024-03-22,0.050000
2024-06-25,0.120000
2026-03-26,0.080000
2021-12-27,0.040000
2022-09-26,0.330000
2020-06-23,0.100000
2020-12-21,0.094000
2023-09-25,0.100000
2018-09-25,0.030000
2018-12-24,0.121000
2023-12-22,0.110000
2019-12-23,0.138000
2022-03-25,0.060000
2023-06-26,0.150000
2025-09-25,0.180000
2019-03-26,0.045000
2019-09-24,0.325000
2021-09-24,0.395000
2023-03-27,0.040000
2025-12-26,0.211000
2019-06-24,0.155000
2020-03-24,0.063000
2022-06-24,0.180000
2024-12-26,0.097000
2025-06-25,0.230000
2020-09-22,0.210000
2021-06-24,0.225000
2025-03-26,0.110000
2025-12-31,0.043000
2026-06-25,0.225000
2022-12-23,0.155000
2024-09-25,0.080000