f/overrides/event-backup/cahex-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
2015-09-17,0.033,2019-12-30 08:49:32
2016-09-15,0.022,2019-12-30 08:49:32
2017-09-14,0.012,2019-12-30 08:49:32
2018-09-13,0.014,2019-12-30 08:49:32
2019-09-12,0.03,2019-12-30 08:49:32
2019-03-28,0.0,2019-12-30 08:49:32
2016-03-17,0.03,2019-12-30 08:49:32
2017-03-16,0.006,2019-12-30 08:49:32
2018-03-15,0.014,2019-12-30 08:49:32
2019-03-14,0.009,2019-12-30 08:49:32
2018-12-20,0.255,2019-12-30 08:49:32
2015-06-18,0.033,2019-12-30 08:49:32
2015-12-17,0.171,2019-12-30 08:49:32
2016-06-16,0.019,2019-12-30 08:49:32
2016-12-15,0.038,2019-12-30 08:49:32
2017-12-14,0.019,2019-12-30 08:49:32
2018-06-14,0.013,2019-12-30 08:49:32
2019-06-13,0.008,2019-12-30 08:49:32
2019-02-27,0.0,2019-12-30 08:49:32
2019-04-29,0.0,2019-12-30 08:49:32