f/overrides/event-backup/ioo-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

1015 B

1DateDividends
22001-03-280.047500
32014-06-240.978000
42021-12-130.522000
52021-12-300.049000
62026-06-150.721000
72000-12-200.012000
82006-12-210.678500
92010-06-210.429500
102015-06-240.649500
112021-06-100.625000
122025-06-160.715000
132008-06-230.575500
142010-12-200.254500
152013-12-170.372000
162023-06-070.765000
172004-12-220.081500
182005-12-230.599000
192007-12-240.691000
202009-06-220.556000
212011-12-190.336000
222016-12-220.433500
232019-12-160.436000
242020-12-140.433000
252024-06-110.650000
262025-12-160.447000
272003-12-220.323000
282008-12-220.366500
292012-06-200.539500
302014-12-190.364500
312017-06-200.635000
322022-06-090.780000
332023-12-200.437000
342002-12-230.276000
352017-12-210.396500
362009-12-210.279000
372011-06-210.561000
382012-12-170.354000
392019-06-170.651000
402022-12-130.502000
412001-06-070.121000
422001-10-020.104000
432001-12-240.040500
442004-12-230.512500
452013-06-250.542000
462015-12-210.402000
472016-06-210.623000
482018-06-190.648000
492018-12-180.430000
502020-06-150.507000
512024-12-170.435000