f/overrides/event-backup/chil-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,ctime
2019-06-27,0.218,2020-04-10 10:52:23
2019-12-30,0.332,2020-04-10 10:52:23
2020-06-29,0.125,2020-07-09 07:37:08
2019-12-30,0.332,2020-07-09 07:37:08
2019-06-27,0.218,2021-03-01 22:16:32
2020-12-30,0.243,2021-03-01 22:16:32
2021-06-29,0.073,2021-07-12 21:48:45
2019-06-27,0.218,2021-07-12 21:48:45
2020-12-30,0.243,2021-07-12 21:48:45