f/overrides/event-backup/bosox-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

435 B

1DateDividends
22019-12-100.945000
32022-12-130.791000
42024-12-121.174000
52008-12-110.015000
62018-12-111.943000
72016-12-080.450000
82023-12-120.133000
92025-12-160.731000
102010-12-090.448000
112012-12-310.027000
122013-12-181.184000
132014-12-111.068000
142015-12-102.267000
152017-12-121.344000
162021-12-141.604000
172007-12-120.016000
182009-12-100.015000
192020-03-300.242000
202020-12-150.150000
212011-12-080.967000
222012-12-110.449000