f/overrides/event-backup/nwhgx-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
2022-12-21,0.409000
2024-09-09,0.079000
2024-12-19,2.015000
2016-12-16,0.074000
2018-12-19,0.079000
2020-09-08,0.021000
2020-12-29,0.002000
2013-12-13,3.092000
2020-12-21,0.083000
2023-12-20,0.319000
2023-12-28,0.012000
2024-06-10,0.028000
2014-12-16,1.520000
2017-09-11,0.022000
2021-06-07,0.004000
2022-09-12,0.040000
2014-06-13,0.011000
2016-09-12,0.015000
2017-12-18,1.546000
2021-12-21,0.788000
2023-09-11,0.029000
2025-12-18,1.737000
2026-03-18,0.013000
2015-12-17,0.098000
2018-12-18,1.404000
2019-09-09,0.005000
2021-12-22,0.720000
2023-06-12,0.042000
2018-09-10,0.026000
2019-12-18,0.072000
2021-09-07,0.029000
2023-12-21,0.134000
2015-06-12,0.012000
2015-09-10,0.030000
2022-06-06,0.011000