f/overrides/event-backup/nifix-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
2014-06-13,0.016000
2017-12-18,0.061000
2019-01-28,0.111000
2019-12-18,0.018000
2020-03-09,0.015000
2022-09-12,0.256000
2025-12-18,0.076000
2024-06-10,0.182000
2018-12-18,0.070000
2019-02-26,0.113000
2019-06-07,0.081000
2019-09-09,0.076000
2022-12-29,0.015000
2023-06-12,0.161000
2023-12-20,0.092000
2021-12-29,0.041000
2022-03-07,0.096000
2014-12-16,0.012000
2022-06-06,0.234000
2024-09-09,0.084000
2017-03-10,0.009000
2017-09-11,0.078000
2018-06-08,0.060000
2019-03-26,0.119000
2022-12-21,0.033000
2023-09-11,0.113000
2024-12-19,0.039000
2014-09-16,0.035000
2021-03-08,0.023000
2021-06-07,0.065000
2021-09-07,0.142000
2023-03-13,0.019000
2025-09-08,0.106000
2026-03-18,0.041000
2026-06-17,0.203000
2012-12-19,0.008000
2018-09-10,0.060000
2020-06-08,0.061000
2020-12-21,0.063000
2024-03-11,0.011000
2025-03-10,0.066000
2025-06-09,0.147000
2017-06-09,0.038000
2021-12-21,0.358000