f/overrides/event-backup/dbisx-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

665 B

1DateDividendsctime
22006-12-220.4422021-04-20 09:37:01
32007-12-210.0712021-04-20 09:37:01
42021-03-240.0262021-04-20 09:37:01
52003-12-260.1132021-04-20 09:37:01
62020-12-230.0272021-04-20 09:37:01
72019-12-040.2932021-04-20 09:37:01
82013-12-230.1332021-04-20 09:37:01
92012-12-260.1652021-04-20 09:37:01
102020-09-230.0322021-04-20 09:37:01
112018-12-210.4192021-04-20 09:37:01
122004-12-270.122021-04-20 09:37:01
132008-12-230.2232021-04-20 09:37:01
142005-10-280.3492021-04-20 09:37:01
152009-12-230.0882021-04-20 09:37:01
162010-12-230.1692021-04-20 09:37:01
172011-12-230.1342021-04-20 09:37:01
182006-04-190.02021-04-20 09:37:01