f/overrides/event-backup/mchi-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
2023-06-07,0.429000
2023-12-20,0.994000
2024-12-17,0.891000
2025-06-16,0.536000
2012-12-18,0.093000
2021-12-13,0.477000
2022-12-13,0.712000
2026-06-15,0.361000
2011-06-22,0.954000
2013-12-18,0.219000
2018-06-19,0.315000
2020-06-15,0.237000
2019-12-16,0.574000
2022-06-09,0.312000
2025-12-16,0.735000
2011-12-20,0.095000
2013-06-27,0.925000
2015-12-21,0.631000
2016-12-21,0.421000
2012-06-21,0.829000
2016-06-22,0.303000
2021-06-10,0.177000
2014-12-17,0.450000
2024-06-11,0.191000
2020-12-14,0.604000
2015-06-25,0.601000
2017-06-20,0.192000
2017-12-19,0.846000
2019-06-17,0.356000
2014-06-25,0.728000
2018-12-18,0.525000