f/overrides/event-backup/jhmm-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
2019-12-24,0.238000
2025-12-29,0.369000
2026-06-26,0.288000
2016-12-23,0.180000
2019-06-25,0.162000
2020-12-24,0.246000
2021-06-25,0.151000
2022-06-27,0.200000
2022-12-27,0.339000
2023-06-27,0.247000
2015-12-24,0.084000
2017-06-26,0.127000
2018-12-24,0.276000
2021-12-27,0.250000
2023-12-26,0.371000
2024-12-27,0.368000
2025-06-26,0.271000
2016-06-24,0.149000
2017-12-26,0.179000
2024-06-26,0.238000
2018-06-26,0.137000
2020-06-25,0.223000