f/overrides/event-backup/nanr-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
2016-06-17,0.247000
2016-12-16,1.430000
2021-12-17,0.708000
2025-06-02,0.503000
2025-12-18,0.700000
2017-06-16,0.205000
2018-12-21,0.359000
2019-12-20,0.399000
2026-06-01,0.713000
2018-06-01,0.205000
2019-06-03,0.283000
2020-12-18,0.565000
2022-06-01,0.507000
2022-12-16,0.958000
2023-12-15,0.717000
2024-06-03,0.478000
2017-12-15,0.445000
2020-06-01,0.340000
2021-06-01,0.439000
2023-06-01,0.701000
2024-12-18,0.646000