f/overrides/event-backup/jnemx-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
2021-12-20,0.460000
2023-12-20,0.454000
2024-12-19,0.610000
2012-03-30,0.059000
2013-03-28,0.047000
2014-06-30,0.290000
2016-06-28,0.190000
2018-12-12,0.166000
2025-12-18,0.671000
2012-06-29,0.153000
2013-09-30,0.027000
2014-12-19,0.023000
2018-12-19,0.405000
2020-12-18,0.260000
2016-09-28,0.029000
2017-03-29,0.029000
2021-12-13,0.986000
2011-06-30,0.163000
2011-09-30,0.033000
2011-12-20,0.022000
2013-06-28,0.160000
2014-03-31,0.087000
2011-03-31,0.054000
2019-04-26,0.033000
2019-12-19,0.573000
2025-12-11,0.804000
2022-12-20,0.472000
2012-09-28,0.030000
2012-12-18,0.028000
2014-09-30,0.034000
2015-06-26,0.175000
2016-03-29,0.024000
2013-12-20,0.019000
2015-12-21,0.042000
2016-12-20,0.049000
2019-03-27,0.022000
2015-03-27,0.065000
2015-09-28,0.031000
2017-12-20,0.307000
2019-02-26,0.013000
2019-10-04,0.018000