f/overrides/event-backup/jsayx-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
2016-09-30,0.063000
2019-06-28,0.049000
2019-12-16,1.741000
2020-03-31,0.032000
2017-06-30,0.045000
2018-09-28,0.050000
2019-09-30,0.062000
2025-12-31,0.579000
2014-12-17,0.262000
2015-12-18,0.228000
2016-03-31,0.038000
2016-06-30,0.058000
2017-12-15,0.468000
2018-12-31,0.386000
2021-12-15,3.181000
2015-12-31,0.255000
2017-12-29,0.273000
2020-09-30,0.027000
2021-03-31,0.034000
2014-12-31,0.373000
2015-06-30,0.067000
2016-12-16,0.191000
2018-03-29,0.043000
2019-12-31,0.273000
2020-12-15,0.682000
2020-12-31,0.294000
2021-06-30,0.039000
2017-03-31,0.045000
2018-12-14,0.514000
2021-09-30,0.008000
2023-12-29,0.388000
2024-12-31,0.547000
2025-12-15,0.765000
2015-09-30,0.018000
2017-09-29,0.049000
2018-06-29,0.053000
2021-12-31,0.615000
2022-12-30,0.325000
2015-03-31,0.023000
2016-12-30,0.225000
2019-03-29,0.038000
2020-06-30,0.032000
2022-12-15,1.625000
2024-12-16,0.473000