f/overrides/event-backup/nwwux-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
2016-03-15,0.015000
2018-12-20,0.663000
2019-03-12,0.017000
2020-12-23,0.354000
2021-12-23,1.046000
2024-06-13,0.036000
2017-06-13,0.057000
2018-03-13,0.018000
2023-09-14,0.004000
2025-12-23,1.100000
2026-06-24,0.045000
2014-12-19,0.130000
2022-06-09,0.035000
2023-12-22,0.474000
2026-03-25,0.012000
2015-09-15,0.029000
2018-06-12,0.065000
2019-09-12,0.041000
2019-12-23,0.774000
2025-06-12,0.050000
2015-12-21,0.202000
2016-09-15,0.021000
2016-12-19,0.359000
2021-09-09,0.031000
2022-09-15,0.016000
2024-09-12,0.032000
2015-06-16,0.053000
2015-03-17,0.012000
2016-06-14,0.052000
2017-03-14,0.012000
2017-12-20,0.477000
2018-09-12,0.035000
2020-09-10,0.450000
2017-09-14,0.034000
2019-06-11,0.058000
2022-12-23,0.206000
2023-06-15,0.044000
2024-12-23,1.454000
2025-09-11,0.032000