f/overrides/event-backup/hewc-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
2015-12-28,0.033851
2018-12-28,0.405831
2020-07-02,1.085554
2019-07-02,0.232064
2019-12-24,0.286851
2016-07-06,0.189569
2016-12-28,0.267960
2017-12-28,0.039938
2022-12-23,0.302593
2023-10-10,0.072265
2017-07-06,0.017890
2018-07-03,0.068236
2020-12-24,0.340884
2021-12-23,0.436168
2023-07-03,0.350119