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

774 B

1DateDividendsctime
22015-09-170.0332019-12-30 08:49:32
32016-09-150.0222019-12-30 08:49:32
42017-09-140.0122019-12-30 08:49:32
52018-09-130.0142019-12-30 08:49:32
62019-09-120.032019-12-30 08:49:32
72019-03-280.02019-12-30 08:49:32
82016-03-170.032019-12-30 08:49:32
92017-03-160.0062019-12-30 08:49:32
102018-03-150.0142019-12-30 08:49:32
112019-03-140.0092019-12-30 08:49:32
122018-12-200.2552019-12-30 08:49:32
132015-06-180.0332019-12-30 08:49:32
142015-12-170.1712019-12-30 08:49:32
152016-06-160.0192019-12-30 08:49:32
162016-12-150.0382019-12-30 08:49:32
172017-12-140.0192019-12-30 08:49:32
182018-06-140.0132019-12-30 08:49:32
192019-06-130.0082019-12-30 08:49:32
202019-02-270.02019-12-30 08:49:32
212019-04-290.02019-12-30 08:49:32