f/overrides/event-backup/jrbyx-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
2019-12-16,0.106000
2020-03-31,0.092000
2021-03-31,0.082000
2021-06-30,0.138000
2013-06-28,0.058000
2015-03-31,0.061000
2018-03-29,0.081000
2018-12-31,0.179000
2017-09-29,0.097000
2020-09-30,0.109000
2015-06-30,0.123000
2015-09-30,0.076000
2015-12-31,0.164000
2017-03-31,0.065000
2023-12-29,0.680000
2024-12-31,0.804000
2014-06-30,0.138000
2018-09-28,0.107000
2018-12-14,0.694000
2021-09-30,0.089000
2019-03-29,0.090000
2019-12-31,0.180000
2020-12-15,0.264000
2021-12-31,0.287000
2012-09-28,0.113000
2013-12-18,0.011000
2018-06-29,0.176000
2017-12-29,0.198000
2025-12-31,0.962000
2013-12-31,0.141000
2014-12-17,0.077000
2016-06-30,0.128000
2016-09-30,0.083000
2016-03-31,0.067000
2016-12-30,0.174000
2017-06-30,0.136000
2019-09-30,0.115000
2013-09-30,0.062000
2014-09-30,0.075000
2014-12-31,0.140000
2015-12-18,0.007000
2020-06-30,0.090000
2020-12-31,0.136000
2021-12-15,0.818000
2022-12-30,0.537000
2012-12-31,0.126000
2013-03-28,0.056000
2014-03-31,0.062000
2019-06-28,0.187000