f/overrides/event-backup/mitjx-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
2013-05-31,0.072000
2017-12-19,2.042000
2019-06-28,0.396000
2023-12-21,3.499000
2022-07-29,0.918000
2013-12-17,0.584000
2014-05-30,0.252000
2019-12-17,2.189000
2020-12-15,1.444000
2021-06-30,0.475000
2022-12-13,2.195000
2025-07-31,0.888000
2023-07-31,0.376000
2026-07-31,0.515000
2014-12-18,1.770000
2016-06-30,0.228000
2016-12-20,1.579000
2018-06-29,0.175000
2020-06-30,0.220000
2012-12-18,0.728000
2024-12-19,4.848000
2025-12-18,4.327000
2015-06-30,0.202000
2015-12-17,1.534000
2018-12-18,3.634000
2021-12-14,3.269000
2024-07-31,0.467000
2017-06-30,0.398000